CVE-2017-5439 : Exploit Details and Defense Strategies
Learn about CVE-2017-5439, a use-after-free vulnerability in XSLT processing affecting Thunderbird, Firefox ESR, and Firefox. Find out how to mitigate and prevent this security issue.
A use-after-free vulnerability during XSLT processing due to poor handling of template parameters. This results in a potentially exploitable crash affecting Thunderbird, Firefox ESR, and Firefox.
Understanding CVE-2017-5439
What is CVE-2017-5439?
The vulnerability arises from XSLT processing, leading to a use-after-free issue when template parameters are not handled correctly. This flaw can result in a crash that may be exploited by attackers.
The Impact of CVE-2017-5439
The vulnerability impacts Thunderbird versions prior to 52.1, Firefox ESR versions prior to 45.9 and 52.1, as well as Firefox versions prior to 53.
Technical Details of CVE-2017-5439
Vulnerability Description
The vulnerability is a use-after-free in nsTArray Length() during XSLT processing.
Affected Systems and Versions
- Thunderbird versions prior to 52.1
- Firefox ESR versions prior to 45.9 and 52.1
- Firefox versions prior to 53
Exploitation Mechanism
The vulnerability occurs due to poor handling of template parameters during XSLT processing, leading to a use-after-free scenario.
Mitigation and Prevention
Immediate Steps to Take
- Update Thunderbird to version 52.1 or newer
- Update Firefox ESR to version 45.9 or 52.1 or newer
- Update Firefox to version 53 or newer
Long-Term Security Practices
- Regularly update software to the latest versions
- Implement secure coding practices to handle template parameters safely
Patching and Updates
Apply the latest patches and updates provided by Mozilla to address the vulnerability.