界: Input Validation and Representation

入力の検証や表現の問題は、メタキャラクター、代替エンコーディング、数値表現などによって引き起こされます。セキュリティの問題は、入力を信頼することに起因します。この問題に含まれるのは、「Buffer Overflow」、「Cross-Site Scripting」攻撃、「SQL Injection」などです。

Mail Command Injection: SMTP

Abstract

信頼できないソースから SMTP コマンドを実行すると、SMTP サーバーが攻撃者に代わって悪意のあるコマンドを実行する可能性があります。

Explanation

このようなタイプの脆弱性は、次の場合に発生する可能性があります。SMTP Command Injection の脆弱性は、攻撃者が SMTP メールサーバーに送信されるコマンドに影響を与える可能性がある場合に発生します。
1.信頼できないソースからアプリケーションにデータが入力された場合。

2.アプリケーションによって実行されるコマンドを表す文字列として、またはその一部であるデータが使用された場合。

3.攻撃者は、SMTP コマンドを実行することで、スパムの送信などの悪意のあるアクションを実行するようにサーバーに指示できます。
例 1: 次のコードは、HTTP リクエストパラメーターを使用して、SMTP サーバーに送信される VRFY コマンドを作成します。攻撃者はこのパラメーターを使用して、サーバーに送信されるコマンドを変更し、CRLF 文字を使用して新しいコマンドを挿入する可能性があります。


  ...
    c, err := smtp.Dial(x)
	if err != nil {
		log.Fatal(err)
	}
	user := request.FormValue("USER")
	c.Verify(user)
  ...

References

[1] Standards Mapping - Common Weakness Enumeration CWE ID 88, CWE ID 93, CWE ID 147

[2] Standards Mapping - Common Weakness Enumeration Top 25 2021 [25] CWE ID 077

[3] Standards Mapping - Common Weakness Enumeration Top 25 2022 [17] CWE ID 077

[4] Standards Mapping - Common Weakness Enumeration Top 25 2023 [16] CWE ID 077

[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001310, CCI-002754

[6] Standards Mapping - FIPS200 SI

[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data

[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)

[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation

[10] Standards Mapping - OWASP API 2023 API3 Broken Object Property Level Authorization

[11] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.2.3 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.2.2 Sanitization and Sandboxing Requirements (L1 L2 L3)

[12] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls

[13] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation

[14] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1

[15] Standards Mapping - OWASP Top 10 2004 A6 Injection Flaws

[16] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws

[17] Standards Mapping - OWASP Top 10 2010 A1 Injection

[18] Standards Mapping - OWASP Top 10 2013 A1 Injection

[19] Standards Mapping - OWASP Top 10 2017 A1 Injection

[20] Standards Mapping - OWASP Top 10 2021 A03 Injection

[21] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.6

[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1

[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1

[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1

[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1

[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1

[28] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4

[29] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection

[30] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation

[31] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation

[32] Standards Mapping - SANS Top 25 2010 Insecure Interaction - CWE ID 078

[33] Standards Mapping - SANS Top 25 2011 Insecure Interaction - CWE ID 078

[34] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3570 CAT I

[35] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I, APP3570 CAT I

[36] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I, APP3570 CAT I

[37] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I, APP3570 CAT I

[38] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I, APP3570 CAT I

[39] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I, APP3570 CAT I

[40] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I, APP3570 CAT I

[41] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[42] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[43] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[44] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[45] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[46] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[47] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[48] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[49] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[50] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[51] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[52] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[53] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[54] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002510 CAT I, APSC-DV-002530 CAT II, APSC-DV-002560 CAT I

[55] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002510 CAT I, APSC-DV-002530 CAT II, APSC-DV-002560 CAT I

[56] Standards Mapping - Web Application Security Consortium Version 2.00 Mail Command Injection (WASC-30)

desc.dataflow.golang.mail_command_injection_smtp

Abstract

SMTP コマンドを信頼されていないソースから実行すると、SMTP サーバーが攻撃者に利用されて悪意のあるコマンドを実行する場合があります。

Explanation

SMTP コマンドインジェクションの脆弱性は、攻撃者が SMTP メールサーバーに送信されるコマンドに影響を与えることができる場合に発生します。

1. 信頼できないソースからアプリケーションにデータが入り込んだ場合。

2. データが、アプリケーションが実行するコマンドを表す文字列 (またはその一部) として使用された場合。

3. SMTP コマンドを実行することで、攻撃者がサーバーに対してスパムの送信など悪意のあるアクションを実行するように指示できる場合。

例 1: The following code uses an HTTP request parameter to craft a VRFY command that is sent to the SMTP server.攻撃者はこのパラメーターを使用して、サーバーに送信されるコマンドを変更し、CRLF 文字を使用して新しいコマンドを挿入します。


  ...
  String user = request.getParameter("user");
  SMTPSSLTransport transport = new SMTPSSLTransport(session,new URLName(Utilities.getProperty("smtp.server")));
  transport.connect(Utilities.getProperty("smtp.server"), username, password);
  transport.simpleCommand("VRFY " + user);
  ...

References

[1] OWASP Testing for IMAP/SMTP Injection (OTG-INPVAL-011)

[2] Vicente Aguilera Díaz MX Injection: Capturing and Exploiting Hidden Mail Servers

[3] Standards Mapping - Common Weakness Enumeration CWE ID 88, CWE ID 93, CWE ID 147

[4] Standards Mapping - Common Weakness Enumeration Top 25 2021 [25] CWE ID 077

[5] Standards Mapping - Common Weakness Enumeration Top 25 2022 [17] CWE ID 077

[6] Standards Mapping - Common Weakness Enumeration Top 25 2023 [16] CWE ID 077

[7] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001310, CCI-002754

[8] Standards Mapping - FIPS200 SI

[9] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data

[10] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)

[11] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation

[12] Standards Mapping - OWASP API 2023 API3 Broken Object Property Level Authorization

[13] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.2.3 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.2.2 Sanitization and Sandboxing Requirements (L1 L2 L3)

[14] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls

[15] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation

[16] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1

[17] Standards Mapping - OWASP Top 10 2004 A6 Injection Flaws

[18] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws

[19] Standards Mapping - OWASP Top 10 2010 A1 Injection

[20] Standards Mapping - OWASP Top 10 2013 A1 Injection

[21] Standards Mapping - OWASP Top 10 2017 A1 Injection

[22] Standards Mapping - OWASP Top 10 2021 A03 Injection

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.6

[24] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2

[25] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1

[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1

[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1

[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1

[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1

[30] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4

[31] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection

[32] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation

[33] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation

[34] Standards Mapping - SANS Top 25 2010 Insecure Interaction - CWE ID 078

[35] Standards Mapping - SANS Top 25 2011 Insecure Interaction - CWE ID 078

[36] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3570 CAT I

[37] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I, APP3570 CAT I

[38] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I, APP3570 CAT I

[39] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I, APP3570 CAT I

[40] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I, APP3570 CAT I

[41] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I, APP3570 CAT I

[42] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I, APP3570 CAT I

[43] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[44] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[45] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[46] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[47] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[48] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[49] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[50] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[51] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[52] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[53] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[54] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[55] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002510 CAT I, APSC-DV-002560 CAT I

[56] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002510 CAT I, APSC-DV-002530 CAT II, APSC-DV-002560 CAT I

[57] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002510 CAT I, APSC-DV-002530 CAT II, APSC-DV-002560 CAT I

[58] Standards Mapping - Web Application Security Consortium Version 2.00 Mail Command Injection (WASC-30)

desc.dataflow.java.mail_command_injection_smtp

Abstract

SMTP コマンドを信頼されていないソースから実行すると、SMTP サーバーが攻撃者に利用されて悪意のあるコマンドを実行する場合があります。

Explanation


...
user = request.GET['user']
session = smtplib.SMTP(smtp_server, smtp_tls_port)
session.ehlo()
session.starttls()
session.login(username, password)
session.docmd("VRFY", user)
...