CVE-2025-54141: 
Homebrew vulnerability analysis and mitigation

ViewVC, a browser interface for CVS and Subversion version control repositories, disclosed a security vulnerability (CVE-2025-54141) affecting versions 1.1.0 through 1.1.31 and 1.2.0 through 1.2.3. The vulnerability was discovered in the standalone.py script, which could expose the contents of the host server's filesystem through a directory traversal-style attack. The issue was officially disclosed on July 22, 2025, and has been fixed in versions 1.1.31 and 1.2.4 (GitHub Advisory).

The vulnerability received a CVSS v3.1 base score of 7.5 (High), with a vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. The issue is classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and CWE-497 (Exposure of Sensitive System Information to an Unauthorized Control Sphere). The vulnerability specifically affects the standalone.py script, which fails to properly validate and sanitize path traversal attempts, potentially allowing access to files outside the intended directory structure (GitHub Advisory, NVD).

The vulnerability's primary impact is the potential exposure of server filesystem contents, particularly affecting servers running the standalone script with remote and anonymous access. While the standalone server is not intended for production use, affected systems could allow attackers to access directories readable by the ViewVC process outside the targeted CVS repository. The exposure is limited to directory names and structure, with no confirmed cases of non-CVS file content exposure (GitHub Advisory).

The primary mitigation is to upgrade ViewVC to version 1.2.4, or version 1.1.31 for users on the 1.1.x release line. For those unable to upgrade immediately, manual patches can be applied from the commits available at GitHub. The patches implement proper path normalization and validation to prevent directory traversal attacks (GitHub Advisory).