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CVE-2025-54141: ViewVC Directory Traversal Vulnerability

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Overview

This report discusses the CVE-2025-54141 vulnerability, a severe security flaw that affects versions 1.1.0 through 1.1.31 and 1.2.0 through 1.2.3 of the ViewVC browser interface for CVS and Subversion version control repositories. This vulnerability matters significantly as it can potentially expose the contents of the host server’s filesystem, leading to data leakage and system compromise.

Vulnerability Summary

CVE ID: CVE-2025-54141
Severity: High (7.5 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

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Product | Affected Versions

ViewVC | 1.1.0 through 1.1.31
ViewVC | 1.2.0 through 1.2.3

How the Exploit Works

The exploit works by leveraging a directory traversal-style attack against the standalone.py script provided in the ViewVC distribution. An attacker can craft malicious requests that manipulate the script’s file fetching functionality, thereby gaining unauthorized access to the host server’s filesystem.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. This could be a sample HTTP GET request, where the attacker attempts to traverse the directories and access a sensitive file:

GET /viewvc/standalone.py/../../../../etc/passwd HTTP/1.1
Host: target.example.com

This request attempts to access the `/etc/passwd` file, which contains sensitive information about user accounts on a Unix-like system.

Mitigation Guidance

To mitigate this vulnerability, users are advised to apply the vendor patch as soon as possible. This is fixed in versions 1.1.31 and 1.2.4 of ViewVC. In situations where immediate patching is not feasible, deploying a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure.

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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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