界: Code Quality

コードの質が低いと、予測できない動作につながります。ユーザーの視点には、それがしばしば使い勝手の悪さとなって現れます。攻撃者にとっては、予期せぬ方法でシステムにストレスを与える機会となります。

Android Bad Practices: Use of Released Media Resource

Abstract
このコードは、Android メディアオブジェクトが解放された後に、このオブジェクトを参照します。
Explanation
このコードは、メディアオブジェクトがすでに解放された後でこのオブジェクトの使用を試みます。リソースを再取得しないままこのメディアオブジェクトをさらに参照すると例外が発生し、この例外がキャッチされない場合にはアプリケーションがクラッシュする可能性があります。

例: 次のコードは、一時停止ボタンを使用してメディアの再生を切り替えています。ユーザーがこのボタンを 1 度押すと、楽曲または動画の再生が一時停止し、カメラリソースは解放されます。ただし、再びボタンを押すと、以前に解放されたメディアリソースで start() がコールされます。


public class ReuseMediaPlayerActivity extends Activity {
private MediaPlayer mp;

...
private class PauseButtonListener implements OnClickListener {
public void onClick(View v) {
if (paused) {
mp.pause();
mp.release();
}
else {
mp.start();
}
paused = !paused;
}
}
...
}
References
[1] Media Player, Android Developers
[2] Audio Capture, Android Developers
[3] Standards Mapping - Common Weakness Enumeration CWE ID 416
[4] Standards Mapping - Common Weakness Enumeration Top 25 2019 [1] CWE ID 119, [7] CWE ID 416
[5] Standards Mapping - Common Weakness Enumeration Top 25 2020 [5] CWE ID 119, [8] CWE ID 416
[6] Standards Mapping - Common Weakness Enumeration Top 25 2021 [7] CWE ID 416
[7] Standards Mapping - Common Weakness Enumeration Top 25 2022 [7] CWE ID 416
[8] Standards Mapping - Common Weakness Enumeration Top 25 2023 [4] CWE ID 416
[9] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001094
[10] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[11] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-5 Denial of Service Protection (P1)
[12] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-5 Denial of Service Protection
[13] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4
[14] Standards Mapping - OWASP Top 10 2004 A9 Application Denial of Service
[15] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.9
[16] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.6
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.6
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.6
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.6
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[21] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[22] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection
[23] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection
[24] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP6080 CAT II
[25] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP6080 CAT II
[26] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP6080 CAT II
[27] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP6080 CAT II
[28] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP6080 CAT II
[29] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP6080 CAT II
[30] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP6080 CAT II
[31] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002400 CAT II
[32] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002400 CAT II
[33] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002400 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002400 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002400 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002400 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002400 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002400 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002400 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002400 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002400 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002400 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002400 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002400 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002400 CAT II
[46] Standards Mapping - Web Application Security Consortium Version 2.00 Denial of Service (WASC-10)
[47] Standards Mapping - Web Application Security Consortium 24 + 2 Denial of Service
desc.controlflow.java.android_bad_practices_use_of_released_media_resource