[2.3.0] Checkmk Werk 16163 created: jar_signature: Prevent privilege escalation to root

Title: jar_signature: Prevent privilege escalation to root Class: security Compatible: incomp Component: checks Date: 1702395666 Edition: cre Level: 3 Version: 2.3.0b1 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.