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How the CVE Works:
CVE-2025-12345 exploits an improper privilege assignment flaw in `pypickle` versions ≤1.1.5. The vulnerability resides in the `Save` function (pypickle/pypickle.py), which fails to enforce proper file permission validations during serialization. Attackers with local access can manipulate the `Save` function to write arbitrary files with elevated permissions (e.g., world-writable), enabling privilege escalation or data tampering. The exploit requires local execution but can chain with other bugs for remote impact. The patch enforces strict `umask` checks and restricts file creation modes.
DailyCVE Form:
Platform: Python/pypickle
Version: ≤1.1.5
Vulnerability: Privilege Escalation
Severity: Moderate
Date: 2025-05-26
Prediction: Patch expected by 2025-06-02
What Undercode Say:
Exploitation:
1. Local File Overwrite:
import pypickle
pypickle.Save("/etc/passwd", malicious_data) Abuse weak permissions
2. Permission Check Bypass:
chmod 777 vulnerable_file.pkl Post-exploitation
Mitigation:
1. Patch Upgrade:
pip install pypickle==2.0.0 --force-reinstall
2. Manual Fix:
Patch snippet (umask enforcement): os.umask(0o077) Restrict file creation
Detection:
1. Version Check:
pip show pypickle | grep Version
2. File Audit:
find / -name ".pkl" -perm -o+w World-writable pickle files
Analytics:
- CVSS: 6.7 (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
- Exploitability: Low (requires local access)
- Affected Users: Developers using `pypickle` for serialization.
References:
- GitHub Advisory: GHSA-xxxx-xxxx-xxxx
- Patch Commit: `14b4cae704a0bb4eb6723e238f25382d847a1917`
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
