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CVE-2023-6735: Privilege Escalation Vulnerability in Checkmk’s mk_tsm Agent Plugin

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Overview

CVE-2023-6735 is a high-severity vulnerability identified in the ‘mk_tsm’ agent plugin of Checkmk, a comprehensive IT monitoring system. This flaw allows local users to escalate their privileges on affected systems. The vulnerability affects Checkmk versions prior to 2.2.0p18, 2.1.0p38, and 2.0.0p39. The issue arises from improper input validation and the unsafe use of the ‘eval’ function within the plugin, leading to potential exploitation. ​GitHub+5CVE+5Checkmk+5Checkmk+5Debian Security Tracker+5AttackerKB+5Checkmk

Vulnerability Summary

Affected Products

Product Affected Versions
Checkmk Versions prior to 2.2.0p18, 2.1.0p38, and 2.0.0p39

How the Exploit Works

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The vulnerability stems from the ‘mk_tsm’ agent plugin’s use of the ‘eval’ function without proper input validation. An attacker can craft a malicious command that appears in the output of the ‘ps’ command. Due to insufficient quoting and the unsafe use of ‘eval’, this can lead to the execution of arbitrary commands with elevated privileges. ​GitHub+5Checkmk+5CVE Database+5

Potential Risks

Exploitation of this vulnerability allows a local attacker to execute arbitrary code with root privileges. This can lead to complete system compromise, unauthorized access to sensitive data, and potential lateral movement within the network.​

Mitigation Recommendations

Conclusion

CVE-2023-6735 is a critical vulnerability that poses significant risks to systems running affected versions of Checkmk. Prompt action is required to update the software or disable the vulnerable plugin to prevent potential exploitation. Regular monitoring and adherence to best security practices are essential to safeguard systems against such vulnerabilities.

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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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