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Insecure service configuration - ADB Backups

Description​

The application allows backups via ADB (Android Debug Bridge). The backups performed by this functionality are not encrypted. Sensitive data of authenticated users can be included in the backup, and this data can be extracted by a non-authenticated attacker. Additionally, data can be copied into a USB stick and be moved out of the sphere of control of the application.

Impact​

Leak sensitive information through backups.

Recommendation​

Configure the attribute: application.android:allowBackup to false in the file: AndroidManifest.xml.

Threat​

Unauthorized attacker with the APK installed in a device.

Expected Remediation Time​

⌚ 60 minutes.

Score​

Default score using CVSS 3.1. It may change depending on the context of the src.

Base​

  • Attack vector: L
  • Attack complexity: L
  • Privileges required: N
  • User interaction: N
  • Scope: U
  • Confidentiality: L
  • Integrity: N
  • Availability: N

Temporal​

  • Exploit code maturity: P
  • Remediation level: O
  • Report confidence: R

Result​

  • Vector string: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:R
  • Score:
    • Base: 4.0
    • Temporal: 3.5
  • Severity:
    • Base: Medium
    • Temporal: Low

Score 4.0​

Default score using CVSS 4.0 . It may change depending on the context of the src.

Base 4.0​

  • Attack vector: L
  • Attack complexity: L
  • Attack Requirements: N
  • Privileges required: N
  • User interaction: N
  • Confidentiality (VC): L
  • Integrity (VI): N
  • Availability (VA): N
  • Confidentiality (SC): N
  • Integrity (SI): N
  • Availability (SA): N

Threat 4.0​

  • Exploit maturity: P

Result 4.0​

  • Vector string: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
  • Score:
    • CVSS-BT: 2.0
  • Severity:
    • CVSS-BT: Low

Compliant code​

<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:sharedUserId="android.uid.system" android:versionCode="4" android:versionName="1.0" package="com.android.zerosms">
  <uses-permission android:name="android.permission.SEND_SMS"/>
  <application android:label="@7F040001" android:icon="@7F020002" android:allowBackup="False">
  </application>
</manifest>

Non compliant code​

The application manifest does not allow backup

<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:sharedUserId="android.uid.system" android:versionCode="4" android:versionName="1.0" package="com.android.zerosms">
  <uses-permission android:name="android.permission.SEND_SMS"/>
  <application android:label="@7F040001" android:icon="@7F020002">
  </application>
</manifest>

Requirements​

Fixes​

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