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The CVE-2025-XXXXX vulnerability in ModelContextProtocol/Server-Filesystem arises due to improper path validation when handling directory prefixes. The system fails to properly resolve path collisions, allowing an attacker to bypass access restrictions by crafting a malicious path that partially matches an allowed directory prefix. For example, if `/allowed_dir/` is permitted, a request for `/allowed_dir../restricted_file` may bypass validation, granting unauthorized file access. This occurs due to insufficient normalization checks before comparing path prefixes.
DailyCVE Form:
Platform: ModelContextProtocol/Server-Filesystem
Version: <= 0.6.2, >= 2025.1.14 < 2025.7.1
Vulnerability: Path validation bypass
Severity: High
Date: Jul 1, 2025
Prediction: Patch expected by Jul 8, 2025
What Undercode Say:
Check installed version npm list @modelcontextprotocol/server-filesystem Exploit PoC (simulated) curl http://target/files?path=/allowed_dir/../../secret Patch verification npm update @modelcontextprotocol/[email protected]
How Exploit:
- Craft malicious path with colliding prefix.
- Bypass validation via `../` sequences.
- Access restricted files.
Protection from this CVE:
- Upgrade to v2025.7.1.
- Implement strict path normalization.
- Restrict filesystem access via chroot.
Impact:
- Unauthorized file disclosure.
- Potential privilege escalation.
- System integrity compromise.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
