Werk #16163: jar_signature: Prevent privilege escalation to root
| Component | Checks & agents |
| Title | jar_signature: Prevent privilege escalation to root |
| Date | Dec 12, 2023 |
| Checkmk Edition | Checkmk Raw (CRE) |
| Checkmk Version | 2.1.0p38 2.2.0p18 2.3.0b1 |
| Level | Major Change |
| Class | Security Fix |
| Compatibility | Incompatible - Manual interaction might be required |
jar_signature agent plugin (configured by the 'Signatures of certificates in JAR files' bakery rule) was vulnerable to privilege escalation to root by the oracle user.
A malicious oracle user could replace the jarsigner binary with another script and put it in the JAVA_HOME directory. The script would be executed by the root user.
The jarsigner is now executed by the oracle user, preventing the privilege escalation.
This werk is incompatible for users that use the jar_signature plugin. Too avoid risk, users should deploy the new version of the plugin or disable it.
This issue was found during internal review.
Affected Versions
- 2.2.0
- 2.1.0
- 2.0.0 (EOL) and older
Mitigations
If updating is not possible, disable the jar_signature plugin.
Vulnerability Management
We have rated the issue with a CVSS score of 8.8 (High) with the following CVSS vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
We have assigned CVE-2023-6740.
Changes
The jarsigner binary is now executed by the oracle user.
