YARD Documentation Server Path Traversal Allows Arbitrary File Read
A path sanitization vulnerability in YARD's built-in documentation server could allow attackers to read arbitrary files from the host system. Ubuntu has released a security update to address this critical flaw.
TL;DR
- YARD's documentation server fails to properly sanitize file paths, enabling path traversal attacks
- Attackers can exploit this vulnerability to read sensitive files from the server host
- Ubuntu security update USN-8394-1 patches the vulnerability across affected releases
- Organizations using YARD should apply updates immediately to prevent unauthorized file disclosure
YARD, a popular Ruby documentation generation tool, contains a path traversal vulnerability in its built-in documentation server that could expose sensitive files on affected systems. The vulnerability stems from inadequate sanitization of file paths, allowing attackers to bypass intended access restrictions and read arbitrary files from the server host.
This type of information disclosure vulnerability poses a significant risk to development environments and documentation servers that expose YARD instances to untrusted networks. Ubuntu has released security update USN-8394-1 to address this issue across affected distributions.
Vulnerability Details
- Path traversal flaw in YARD's documentation server allows reading files outside intended directories
- Insufficient input validation enables attackers to craft malicious requests using path manipulation techniques
- Vulnerability affects YARD's built-in HTTP server used for serving generated documentation
- No authentication bypass required; exploitation can occur through simple HTTP requests
Impact and Remediation
- Sensitive configuration files, source code, and credentials could be exposed to attackers
- Ubuntu security update USN-8394-1 provides patched versions across supported releases
- Organizations should prioritize applying updates to YARD installations accessible over networks
- Consider restricting documentation server access to trusted networks pending patch deployment
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