Insecure digital certificates
Description
The apk certificate was signed using the SHA1 algorithm. This algorithm is considered quite insecure, so it should not be used to sign certificates since it can be reversed in order to obtain the signing key. On the other hand, there are URLs that, just by accessing them, it is possible to download the digital certificates stored in them, thus exposing confidential information of the organization.
Impact
- Obtain the signing key of the applications certificate.
- Change the application in the appStore to a malicious one by using the obtained signing keys.
Recommendation
Sign the certificate with SHA2 or higher.
Threat
Anonymous attacker from the Internet.
Expected Remediation Time
⌚ 15 minutes.
Score
Default score using CVSS 3.1. It may change depending on the context of the src.
Base
- Attack vector: N
- Attack complexity: H
- Privileges required: N
- User interaction: N
- Scope: U
- Confidentiality: L
- Integrity: L
- Availability: N
Temporal
- Exploit code maturity: P
- Remediation level: O
- Report confidence: X
Result
- Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:X
- Score:
- Base: 4.8
- Temporal: 4.3
- Severity:
- Base: Medium
- Temporal: Medium
Score 4.0
Default score using CVSS 4.0. It may change depending on the context of the src.
Base 4.0
- Attack vector: N
- Attack complexity: H
- Attack Requirements: N
- Privileges required: N
- User interaction: N
- Confidentiality (VC): L
- Integrity (VI): L
- 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:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
- Score:
- CVSS-BT: 2.9
- Severity:
- CVSS-BT: Low
Compliant code
The application has a secure algorithm for the certificate signature
android {
signingConfigs {
getByName("config") {
keyAlgorithm = keystoreProperties["SHA2"]
...
}
}
}
Non compliant code
The application has an insecure algorithm for the certificate signature
android {
signingConfigs {
getByName("config") {
keyAlgorithm = keystoreProperties["SHA1"]
...
}
}
}
Requirements
- 088.Request client certificates
- 089.Limit validity of certificates
- 090.Use valid certificates
- 091.Use internally signed certificates
- 092.Use externally signed certificates
- 093.Use consistent certificates
Fixes
