Kingdom: Security Features
Software security is not security software. Here we're concerned with topics like authentication, access control, confidentiality, cryptography, and privilege management.
Weak Encryption: Stream Cipher
Abstract
Stream ciphers are dangerous to use when encrypted data is stored on disk, or if the key is used more than once.
Explanation
Stream ciphers are vulnerable to "key re-use" attacks, also called "two-time pad" attacks. This type of vulnerability occurs when you use the same key more than once because it is trivial to XOR the two ciphertext strings and nullify the key, which leaves only XOR'ed plain text. Due to the way human language is formatted, it is usually trivial to recover to the original two messages.
To stop the aforementioned attacks requires the use of a fresh initialization vector (IV), and therefore stream ciphers are not suitable to store encrypted data, as it means that either:
1) The disk sector is used as the IV:
This is insecure as it requires re-using the same IV every time the stored data requires modification.
2) Using a complicated system to map fresh IVs to disk sectors:
This is difficult to maintain. Such an approach requires that IVs are continuously updated, need to be unreadable by users, and requires that the ciphertext consumes more disk space than the unencrypted plain text.
Based on these two points, it is disadvantageous to use stream ciphers instead of block ciphers to store encrypted data. Another problem with stream ciphers is that they provide no authentication and therefore are vulnerable to "bit-flipping" attacks. Some block ciphers such as "CTR" are vulnerable to these same attacks because they function similarly to stream ciphers.
Example 1: The following code creates a stream cipher that is used to encrypt data with a constant IV and store it on disk:
In
To stop the aforementioned attacks requires the use of a fresh initialization vector (IV), and therefore stream ciphers are not suitable to store encrypted data, as it means that either:
1) The disk sector is used as the IV:
This is insecure as it requires re-using the same IV every time the stored data requires modification.
2) Using a complicated system to map fresh IVs to disk sectors:
This is difficult to maintain. Such an approach requires that IVs are continuously updated, need to be unreadable by users, and requires that the ciphertext consumes more disk space than the unencrypted plain text.
Based on these two points, it is disadvantageous to use stream ciphers instead of block ciphers to store encrypted data. Another problem with stream ciphers is that they provide no authentication and therefore are vulnerable to "bit-flipping" attacks. Some block ciphers such as "CTR" are vulnerable to these same attacks because they function similarly to stream ciphers.
Example 1: The following code creates a stream cipher that is used to encrypt data with a constant IV and store it on disk:
import (
"crypto/aes"
"crypto/cipher"
"os"
)
...
iv = b'1234567890123456'
CTRstream = cipher.NewCTR(block, iv)
CTRstream.XORKeyStream(plaintext, ciphertext)
...
f := os.Create("data.enc")
f.Write(ciphertext)
f.Close()
In
Example 1, because iv is set as a constant initialization vector, this is susceptible to re-use attacks.References
[1] Disk Encryption Theory Wikipedia
[2] Clemens Fruhwirth New Methods in Hard Disk Encryption
[3] Standards Mapping - Common Weakness Enumeration CWE ID 327
[4] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002450
[5] Standards Mapping - FIPS200 MP
[6] Standards Mapping - General Data Protection Regulation (GDPR) Insufficient Data Protection
[7] Standards Mapping - NIST Special Publication 800-53 Revision 4 AU-10 Non-Repudiation (P2), SC-13 Cryptographic Protection (P1)
[8] Standards Mapping - NIST Special Publication 800-53 Revision 5 AU-10 Non-Repudiation, SC-13 Cryptographic Protection
[9] Standards Mapping - OWASP Application Security Verification Standard 4.0 2.6.3 Look-up Secret Verifier Requirements (L2 L3), 2.9.3 Cryptographic Software and Devices Verifier Requirements (L2 L3), 6.2.1 Algorithms (L1 L2 L3), 6.2.2 Algorithms (L2 L3), 8.3.7 Sensitive Private Data (L2 L3), 9.1.2 Communications Security Requirements (L1 L2 L3), 9.1.3 Communications Security Requirements (L1 L2 L3)
[10] Standards Mapping - OWASP Mobile 2014 M6 Broken Cryptography
[11] Standards Mapping - OWASP Mobile 2024 M10 Insufficient Cryptography
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CRYPTO-1
[13] Standards Mapping - OWASP Top 10 2004 A8 Insecure Storage
[14] Standards Mapping - OWASP Top 10 2007 A8 Insecure Cryptographic Storage
[15] Standards Mapping - OWASP Top 10 2010 A7 Insecure Cryptographic Storage
[16] Standards Mapping - OWASP Top 10 2013 A6 Sensitive Data Exposure
[17] Standards Mapping - OWASP Top 10 2017 A3 Sensitive Data Exposure
[18] Standards Mapping - OWASP Top 10 2021 A02 Cryptographic Failures
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.8
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.3, Requirement 6.5.8
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.3
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.3
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.3
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.3
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.3
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 7.1 - Use of Cryptography
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 7.1 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 7.1 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design
[31] Standards Mapping - SANS Top 25 2009 Porous Defenses - CWE ID 327
[32] Standards Mapping - SANS Top 25 2010 Porous Defenses - CWE ID 327
[33] Standards Mapping - SANS Top 25 2011 Porous Defenses - CWE ID 327
[34] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3150.1 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3150.1 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3150.1 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3150.1 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3150.1 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3150.1 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3150.1 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[53] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[54] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000590 CAT II, APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[55] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000590 CAT II, APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
desc.semantic.golang.weak_encryption_stream_cipher
Abstract
Stream ciphers are dangerous to use with stored data or if the key is used more than once.
Explanation
Stream ciphers are vulnerable to "key re-use" attacks, also called "two-time pad" attacks. This means that if the same key is used more than once, it is trivial to XOR the two strings of ciphertext and nullify the key, leaving only the XOR'ed plain text. Due to the way human language is formatted, it is usually trivial to get back to the original two messages.
As there is a requirement to use a fresh initialization vector (IV) to stop the aforementioned attacks, stream ciphers are not suitable for storing encrypted data, as it would mean either:
1) using the disk sector as the IV:
This is insecure because you must reuse the same IV every time the stored data needs to be modified.
2) have a complicated system that maps fresh IVs to disk sectors:
This is difficult to maintain, because it requires continuous updates, must not be user-readable, and requires the ciphertext to consume much more disk space than the unencrypted plain text alone.
These two points make it disadvantageous to use stream ciphers instead of block ciphers to store encrypted data. Another problem with stream ciphers is that they provide no authentication and thus are vulnerable to "bit-flipping" attacks. Some block ciphers such as "CTR" are vulnerable to these same attacks because they perform similarly to stream ciphers.
Example 1: The following code creates a stream cipher that is then used to encrypt data with a constant IV and store it on disk:
As there is a requirement to use a fresh initialization vector (IV) to stop the aforementioned attacks, stream ciphers are not suitable for storing encrypted data, as it would mean either:
1) using the disk sector as the IV:
This is insecure because you must reuse the same IV every time the stored data needs to be modified.
2) have a complicated system that maps fresh IVs to disk sectors:
This is difficult to maintain, because it requires continuous updates, must not be user-readable, and requires the ciphertext to consume much more disk space than the unencrypted plain text alone.
These two points make it disadvantageous to use stream ciphers instead of block ciphers to store encrypted data. Another problem with stream ciphers is that they provide no authentication and thus are vulnerable to "bit-flipping" attacks. Some block ciphers such as "CTR" are vulnerable to these same attacks because they perform similarly to stream ciphers.
Example 1: The following code creates a stream cipher that is then used to encrypt data with a constant IV and store it on disk:
...
const cipher = crypto.createCipheriv("AES-256-CTR", key, 'iv')
const ciphertext = cipher.update(plaintext, 'utf8');
cipher.final();
fs.writeFile('my_encrypted_data', ciphertext, function (err) {
...
});
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 327
[2] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002450
[3] Standards Mapping - FIPS200 MP
[4] Standards Mapping - General Data Protection Regulation (GDPR) Insufficient Data Protection
[5] Standards Mapping - NIST Special Publication 800-53 Revision 4 AU-10 Non-Repudiation (P2), SC-13 Cryptographic Protection (P1)
[6] Standards Mapping - NIST Special Publication 800-53 Revision 5 AU-10 Non-Repudiation, SC-13 Cryptographic Protection
[7] Standards Mapping - OWASP Application Security Verification Standard 4.0 2.6.3 Look-up Secret Verifier Requirements (L2 L3), 2.9.3 Cryptographic Software and Devices Verifier Requirements (L2 L3), 6.2.1 Algorithms (L1 L2 L3), 6.2.2 Algorithms (L2 L3), 8.3.7 Sensitive Private Data (L2 L3), 9.1.2 Communications Security Requirements (L1 L2 L3), 9.1.3 Communications Security Requirements (L1 L2 L3)
[8] Standards Mapping - OWASP Mobile 2014 M6 Broken Cryptography
[9] Standards Mapping - OWASP Mobile 2024 M10 Insufficient Cryptography
[10] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CRYPTO-1
[11] Standards Mapping - OWASP Top 10 2004 A8 Insecure Storage
[12] Standards Mapping - OWASP Top 10 2007 A8 Insecure Cryptographic Storage
[13] Standards Mapping - OWASP Top 10 2010 A7 Insecure Cryptographic Storage
[14] Standards Mapping - OWASP Top 10 2013 A6 Sensitive Data Exposure
[15] Standards Mapping - OWASP Top 10 2017 A3 Sensitive Data Exposure
[16] Standards Mapping - OWASP Top 10 2021 A02 Cryptographic Failures
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.8
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.3, Requirement 6.5.8
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.3
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.3
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.3
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.3
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.3
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[26] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 7.1 - Use of Cryptography
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 7.1 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 7.1 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design
[29] Standards Mapping - SANS Top 25 2009 Porous Defenses - CWE ID 327
[30] Standards Mapping - SANS Top 25 2010 Porous Defenses - CWE ID 327
[31] Standards Mapping - SANS Top 25 2011 Porous Defenses - CWE ID 327
[32] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3150.1 CAT II
[33] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3150.1 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3150.1 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3150.1 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3150.1 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3150.1 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3150.1 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000590 CAT II, APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[53] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000590 CAT II, APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
desc.structural.javascript.weak_encryption_stream_cipher
Abstract
Stream ciphers are dangerous to use when encrypted data is going to be stored on disk, or if the key is used more than once.
Explanation
Stream ciphers are vulnerable to "key re-use" attacks, also called "two-time pad" attacks. This means that if the same key is used more than once, it is trivial to XOR the two strings of ciphertext and nullify the key, leaving only the XOR'ed plain text. Due to the way human language is formatted, it is usually trivial to get back to the original two messages.
As there is a requirement to use a fresh initialization vector (IV) to stop the aforementioned attacks, stream ciphers are not suitable for storing encrypted data, as it would mean either:
1) using the disk sector as the IV:
This is insecure because you must reuse the same IV every time the stored data needs to be modified.
2) have a complicated system that maps fresh IVs to disk sectors:
This is difficult to maintain, because it requires continuous updates, must not be user-readable, and requires the ciphertext to consume much more disk space than the unencrypted plain text alone.
These two points make it disadvantageous to use stream ciphers instead of block ciphers to store encrypted data. Another problem with stream ciphers is that they provide no authentication and thus are vulnerable to "bit-flipping" attacks. Some block ciphers such as "CTR" are vulnerable to these same attacks because they perform similarly to stream ciphers.
Example 1: The following code creates a stream cipher that is then used to encrypt data with a constant IV and store it on disk:
In
As there is a requirement to use a fresh initialization vector (IV) to stop the aforementioned attacks, stream ciphers are not suitable for storing encrypted data, as it would mean either:
1) using the disk sector as the IV:
This is insecure because you must reuse the same IV every time the stored data needs to be modified.
2) have a complicated system that maps fresh IVs to disk sectors:
This is difficult to maintain, because it requires continuous updates, must not be user-readable, and requires the ciphertext to consume much more disk space than the unencrypted plain text alone.
These two points make it disadvantageous to use stream ciphers instead of block ciphers to store encrypted data. Another problem with stream ciphers is that they provide no authentication and thus are vulnerable to "bit-flipping" attacks. Some block ciphers such as "CTR" are vulnerable to these same attacks because they perform similarly to stream ciphers.
Example 1: The following code creates a stream cipher that is then used to encrypt data with a constant IV and store it on disk:
from Crypto.Cipher import AES
from Crypto import Random
...
key = Random.new().read(AES.block_size)
iv = b'1234567890123456'
cipher = AES.new(key, AES.MODE_CTR, iv, counter)
...
encrypted = cipher.encrypt(data)
f = open("data.enc", "wb")
f.write(encrypted)
f.close()
...
In
Example 1, since iv is set as a constant initialization vector, this will be susceptible to re-use attacks.References
[1] Disk Encryption Theory Wikipedia
[2] Clemens Fruhwirth New Methods in Hard Disk Encryption
[3] Standards Mapping - Common Weakness Enumeration CWE ID 327
[4] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002450
[5] Standards Mapping - FIPS200 MP
[6] Standards Mapping - General Data Protection Regulation (GDPR) Insufficient Data Protection
[7] Standards Mapping - NIST Special Publication 800-53 Revision 4 AU-10 Non-Repudiation (P2), SC-13 Cryptographic Protection (P1)
[8] Standards Mapping - NIST Special Publication 800-53 Revision 5 AU-10 Non-Repudiation, SC-13 Cryptographic Protection
[9] Standards Mapping - OWASP Application Security Verification Standard 4.0 2.6.3 Look-up Secret Verifier Requirements (L2 L3), 2.9.3 Cryptographic Software and Devices Verifier Requirements (L2 L3), 6.2.1 Algorithms (L1 L2 L3), 6.2.2 Algorithms (L2 L3), 8.3.7 Sensitive Private Data (L2 L3), 9.1.2 Communications Security Requirements (L1 L2 L3), 9.1.3 Communications Security Requirements (L1 L2 L3)
[10] Standards Mapping - OWASP Mobile 2014 M6 Broken Cryptography
[11] Standards Mapping - OWASP Mobile 2024 M10 Insufficient Cryptography
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CRYPTO-1
[13] Standards Mapping - OWASP Top 10 2004 A8 Insecure Storage
[14] Standards Mapping - OWASP Top 10 2007 A8 Insecure Cryptographic Storage
[15] Standards Mapping - OWASP Top 10 2010 A7 Insecure Cryptographic Storage
[16] Standards Mapping - OWASP Top 10 2013 A6 Sensitive Data Exposure
[17] Standards Mapping - OWASP Top 10 2017 A3 Sensitive Data Exposure
[18] Standards Mapping - OWASP Top 10 2021 A02 Cryptographic Failures
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.8
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.3, Requirement 6.5.8
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.3
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.3
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.3
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.3
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.3
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 7.1 - Use of Cryptography
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 7.1 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 7.1 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design
[31] Standards Mapping - SANS Top 25 2009 Porous Defenses - CWE ID 327
[32] Standards Mapping - SANS Top 25 2010 Porous Defenses - CWE ID 327
[33] Standards Mapping - SANS Top 25 2011 Porous Defenses - CWE ID 327
[34] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3150.1 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3150.1 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3150.1 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3150.1 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3150.1 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3150.1 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3150.1 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[53] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[54] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000590 CAT II, APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[55] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000590 CAT II, APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
desc.semantic.python.weak_encryption_stream_cipher
Abstract
Stream ciphers are dangerous to use with stored data, or if the key is used more than once.
Explanation
Stream ciphers are vulnerable to "key re-use" attacks, also called "two-time pad" attacks. This means that if the same key is used more than once, it is trivial to XOR the two strings of ciphertext and nullify the key, leaving only the XOR'ed plain text. Due to the way human language is formatted, it is usually trivial to get back to the original two messages.
As there is a requirement to use a fresh initialization vector (IV) to stop the aforementioned attacks, stream ciphers are not suitable for storing encrypted data, as it would mean either:
1) using the disk sector as the IV:
This is insecure because you must reuse the same IV every time the stored data needs to be modified.
2) have a complicated system that maps fresh IVs to disk sectors:
This is difficult to maintain, because it requires continuous updates, must not be user-readable, and requires the ciphertext to consume much more disk space than the unencrypted plain text alone.
These two points make it disadvantageous to use stream ciphers instead of block ciphers to store encrypted data. Another problem with stream ciphers is that they provide no authentication and thus are vulnerable to "bit-flipping" attacks. Some block ciphers such as "CTR" are vulnerable to these same attacks because they perform similarly to stream ciphers.
Example 1: The following code creates a stream cipher that is then used to encrypt data with a constant IV and store it on disk:
In
As there is a requirement to use a fresh initialization vector (IV) to stop the aforementioned attacks, stream ciphers are not suitable for storing encrypted data, as it would mean either:
1) using the disk sector as the IV:
This is insecure because you must reuse the same IV every time the stored data needs to be modified.
2) have a complicated system that maps fresh IVs to disk sectors:
This is difficult to maintain, because it requires continuous updates, must not be user-readable, and requires the ciphertext to consume much more disk space than the unencrypted plain text alone.
These two points make it disadvantageous to use stream ciphers instead of block ciphers to store encrypted data. Another problem with stream ciphers is that they provide no authentication and thus are vulnerable to "bit-flipping" attacks. Some block ciphers such as "CTR" are vulnerable to these same attacks because they perform similarly to stream ciphers.
Example 1: The following code creates a stream cipher that is then used to encrypt data with a constant IV and store it on disk:
require 'openssl'
...
cipher = OpenSSL::Cipher.new('AES-256-CTR')
cipher.encrypt
cipher.iv='iv'
...
encrypted = cipher.update(data) + cipher.final
File.open('my_encrypted_data', 'w') do |file|
file.write(encrypted)
end
In
Example 1, since OpenSSL::Cipher#iv= is set as a constant initialization vector, this will be susceptible to re-use attacks.References
[1] Disk Encryption Theory Wikipedia
[2] Clemens Fruhwirth New Methods in Hard Disk Encryption
[3] Standards Mapping - Common Weakness Enumeration CWE ID 327
[4] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002450
[5] Standards Mapping - FIPS200 MP
[6] Standards Mapping - General Data Protection Regulation (GDPR) Insufficient Data Protection
[7] Standards Mapping - NIST Special Publication 800-53 Revision 4 AU-10 Non-Repudiation (P2), SC-13 Cryptographic Protection (P1)
[8] Standards Mapping - NIST Special Publication 800-53 Revision 5 AU-10 Non-Repudiation, SC-13 Cryptographic Protection
[9] Standards Mapping - OWASP Application Security Verification Standard 4.0 2.6.3 Look-up Secret Verifier Requirements (L2 L3), 2.9.3 Cryptographic Software and Devices Verifier Requirements (L2 L3), 6.2.1 Algorithms (L1 L2 L3), 6.2.2 Algorithms (L2 L3), 8.3.7 Sensitive Private Data (L2 L3), 9.1.2 Communications Security Requirements (L1 L2 L3), 9.1.3 Communications Security Requirements (L1 L2 L3)
[10] Standards Mapping - OWASP Mobile 2014 M6 Broken Cryptography
[11] Standards Mapping - OWASP Mobile 2024 M10 Insufficient Cryptography
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CRYPTO-1
[13] Standards Mapping - OWASP Top 10 2004 A8 Insecure Storage
[14] Standards Mapping - OWASP Top 10 2007 A8 Insecure Cryptographic Storage
[15] Standards Mapping - OWASP Top 10 2010 A7 Insecure Cryptographic Storage
[16] Standards Mapping - OWASP Top 10 2013 A6 Sensitive Data Exposure
[17] Standards Mapping - OWASP Top 10 2017 A3 Sensitive Data Exposure
[18] Standards Mapping - OWASP Top 10 2021 A02 Cryptographic Failures
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.8
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.3, Requirement 6.5.8
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.3
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.3
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.3
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.3
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.3
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 7.1 - Use of Cryptography
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 7.1 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 7.1 - Use of Cryptography, Control Objective B.2.3 - Terminal Software Design
[31] Standards Mapping - SANS Top 25 2009 Porous Defenses - CWE ID 327
[32] Standards Mapping - SANS Top 25 2010 Porous Defenses - CWE ID 327
[33] Standards Mapping - SANS Top 25 2011 Porous Defenses - CWE ID 327
[34] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3150.1 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3150.1 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3150.1 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3150.1 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3150.1 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3150.1 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3150.1 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[53] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[54] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000590 CAT II, APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
[55] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000590 CAT II, APSC-DV-002010 CAT II, APSC-DV-002040 CAT II
desc.structural.ruby.weak_encryption_stream_cipher