CVE-2025-14321
Summary
CVE-2025-14321 is a critical severity Use-After-Free vulnerability affecting the WebRTC Signaling component in Mozilla Firefox and Thunderbird. This flaw allows a remote attacker to potentially execute arbitrary code on a vulnerable system by manipulating memory after it has been freed, leading to unpredictable behavior and potential compromise.
Technical Details
This vulnerability stems from a Use-After-Free condition within the WebRTC Signaling component. Specifically, the issue arises when the application attempts to access or manipulate memory that has already been freed. This can occur due to improper memory management within the WebRTC signaling logic. An attacker could potentially trigger this condition by sending specially crafted WebRTC signaling messages, leading to memory corruption and potentially arbitrary code execution. The WebRTC signaling component is responsible for establishing and managing peer-to-peer connections, making it a critical part of the WebRTC architecture. Successful exploitation of this vulnerability requires the attacker to have control over the signaling process, which may involve intercepting or manipulating signaling messages.
The Use-After-Free condition can lead to a variety of security issues, including crashes, denial-of-service, and arbitrary code execution. The severity of the impact depends on the specific memory layout and the actions performed by the attacker. In the worst-case scenario, the attacker could gain complete control of the affected system.
Affected Products and Versions
- Mozilla Firefox versions prior to 146
- Mozilla Firefox ESR versions prior to 140.6
- Mozilla Thunderbird versions prior to 146
- Mozilla Thunderbird ESR versions prior to 140.6
Impact Assessment
Successful exploitation of CVE-2025-14321 can have severe consequences.
- Arbitrary Code Execution: An attacker can potentially execute arbitrary code on the affected system with the privileges of the vulnerable application.
- System Compromise: Successful exploitation can lead to complete system compromise, allowing the attacker to steal sensitive data, install malware, or use the system as a launchpad for further attacks.
- Denial of Service: The vulnerability can be exploited to cause a denial-of-service condition, making the affected application or system unavailable to legitimate users.
Remediation
Immediate Actions
- Update Affected Software: Immediately update Mozilla Firefox and Thunderbird to the latest versions (146 or later for Firefox and Thunderbird, and 140.6 or later for Firefox ESR and Thunderbird ESR).
- Verify Update Success: After updating, verify that the new version is installed correctly.
Long-term Solutions
- Enable Automatic Updates: Configure Firefox and Thunderbird to automatically install updates to ensure timely patching of future vulnerabilities.
- Monitor Security Advisories: Regularly monitor security advisories from Mozilla and other relevant sources to stay informed about new vulnerabilities and security updates.
References
Detection & Scanning
This vulnerability can be detected by scanning systems for vulnerable versions of Mozilla Firefox and Thunderbird. Ensure your security tools are up-to-date with the latest vulnerability definitions.
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