CVE-2017-5387 : Vulnerability Insights and Analysis
Learn about CVE-2017-5387, a Firefox vulnerability allowing disclosure of local file existence through error messages. Find out how to mitigate and prevent this security issue.
A vulnerability in Firefox versions prior to 51 allows the disclosure of local file existence through error messages in the TRACK tag.
Understanding CVE-2017-5387
This CVE involves a specific issue in Firefox versions before 51 that can lead to the exposure of local file paths through error messages.
What is CVE-2017-5387?
The vulnerability in Firefox versions below 51 enables the identification of requested local files through the behavior of the "onerror" event when a non-existent file is referenced in a locally loaded source page using a "<track>" tag.
The Impact of CVE-2017-5387
The vulnerability allows malicious actors to potentially access sensitive information about local files on a user's system, compromising privacy and security.
Technical Details of CVE-2017-5387
This section provides more in-depth technical insights into the CVE.
Vulnerability Description
The flaw in Firefox versions prior to 51 triggers the "onerror" event twice, revealing the existence of a requested local file when a non-existent file is referenced in a locally loaded source page using a "<track>" tag.
Affected Systems and Versions
- Product: Firefox
- Vendor: Mozilla
- Versions Affected: < 51
Exploitation Mechanism
The vulnerability is exploited by pointing the "source" attribute of a "<track>" tag to a non-existent file on a locally loaded source page, causing the "onerror" event to fire twice.
Mitigation and Prevention
Protecting systems from CVE-2017-5387 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update Firefox to version 51 or higher to mitigate the vulnerability.
- Avoid visiting untrusted websites or clicking on suspicious links.
Long-Term Security Practices
- Regularly update browsers and software to the latest versions.
- Implement robust cybersecurity measures to prevent unauthorized access to local files.
Patching and Updates
Ensure timely installation of security patches and updates provided by Mozilla to address known vulnerabilities.