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Insecure service configuration - Signatures

Description​

The application is signed with a V1 signing scheme, which makes it vulnerable to the Janus vulnerability in Android.

Impact​

Precede a malicious DEX file to an APK file, without affecting its signature.

Recommendation​

Securely configure the vulnerable service so that it can only be accessed by authorized users.

Threat​

Unauthorized attacker from the Internet.

Expected Remediation Time​

⌚ 60 minutes.

Score​

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

Base​

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

Temporal​

  • Exploit code madurity: P
  • Remediation level: X
  • Report confidence: X

Result​

  • Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:X/RC:X
  • Score:
    • Base: 3.1
    • Temporal: 3.0
  • Severity:
    • Base: Low
    • Temporal: Low

Code Examples​

Compliant code​

The application uses a secure signature

APKSigner:
  V1_SIGNATURE: false
  V2_SIGNATURE: true

Non compliant code​

The application has the V1 signature enabled

APKSigner:
  V1_SIGNATURE: true
  V2_SIGNATURE: false

Requirements​

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