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CVE-2023-6740: Privilege escalation vulnerability in jar_signature

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Introduction

​CVE-2023-6740 is a privilege escalation vulnerability identified in the jar_signature agent plugin of Checkmk versions prior to 2.2.0p18, 2.1.0p38, and 2.0.0p39. This flaw allows a local user to escalate their privileges, potentially gaining unauthorized access to sensitive system information or administrative control. ​Checkmk+4Recorded Future+4Ubuntu+4

Technical Details:

The vulnerability arises from the jar_signature plugin's execution</a> of the <code data-start="76" data-end="87">jarsigner binary with elevated privileges. A malicious local user with access to the system could replace the jarsigner binary with a malicious script placed in the JAVA_HOME directory. When the plugin executes this compromised binary, it runs with root privileges, thereby allowing the attacker to escalate their privileges to root. ​Checkmk

Affected Versions:

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Mitigation:

To address this vulnerability, Checkmk has updated the jar_signature plugin to execute the jarsigner binary as the oracle user instead of the root user, preventing the privilege escalation. Users are advised to update to the latest versions of Checkmk to incorporate this fix. If updating is not feasible, disabling the jar_signature plugin is recommended as a temporary mitigation measure. ​Ubuntu+2Checkmk+2Recorded Future+2

Severity:

Checkmk GmbH has assigned this vulnerability a CVSS score of 8.8 (High), with the following vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. ​Ubuntu+3Checkmk+3NVD+3

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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