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How the CVE Works
The vulnerability exploits Thunderbird’s update mechanism, where a medium-integrity user process can interfere with the SYSTEM-level updater by manipulating file-locking behavior. An attacker injects malicious code into a user-privileged process, bypassing access controls. This allows SYSTEM-level file operations on non-privileged paths, leading to privilege escalation. Affected versions include Thunderbird < 138 and Thunderbird ESR < 128.10.
DailyCVE Form
Platform: Mozilla Thunderbird
Version: < 138.0
Vulnerability: Privilege Escalation
Severity: Critical
Date: 2025-04-29
Prediction: Patch by 2025-06-20
What Undercode Say
Check Thunderbird version thunderbird --version Exploit PoC (hypothetical) python3 exploit.py --target <PID> Mitigation command sudo chmod 750 /usr/lib/thunderbird/updater
How Exploit
1. Attacker gains user-level execution.
2. Injects code into Thunderbird process.
3. Manipulates file locks.
4. Triggers SYSTEM-level operations.
Protection from this CVE
- Update to Thunderbird ≥ 138.0.
- Restrict updater permissions.
- Monitor process injections.
Impact
- Full SYSTEM compromise.
- Unauthorized file access.
- Persistent backdoor installation.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
