CVE-2017-7773 : Security Advisory and Response

A vulnerability in the Graphite2 library used by Firefox versions prior to 54 allows for a heap-based buffer overflow when performing lz4::decompress in the src/Decompressor.

Understanding CVE-2017-7773

This CVE-2017-7773 vulnerability affects Mozilla Firefox versions prior to 54.

What is CVE-2017-7773?

The vulnerability is a heap-based buffer overflow in the Graphite2 library within Firefox versions before 54, specifically in the lz4::decompress function in the src/Decompressor.

The Impact of CVE-2017-7773

This vulnerability could allow an attacker to execute arbitrary code or cause a denial of service by crashing the application.

Technical Details of CVE-2017-7773

The technical details of this CVE are as follows:

Vulnerability Description

The vulnerability is a heap-based buffer overflow in the Graphite2 library within Firefox versions prior to 54, specifically in the lz4::decompress function in the src/Decompressor.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Versions Affected: All versions prior to Firefox 54

Exploitation Mechanism

The vulnerability can be exploited by performing lz4::decompress in the src/Decompressor, leading to a heap-based buffer overflow.

Mitigation and Prevention

To mitigate the risks associated with CVE-2017-7773, consider the following steps:

Immediate Steps to Take

Update Firefox to version 54 or newer to eliminate the vulnerability.
Regularly monitor security advisories from Mozilla for any updates or patches.

Long-Term Security Practices

Implement secure coding practices to prevent buffer overflows and other vulnerabilities.
Conduct regular security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

Apply patches and updates provided by Mozilla promptly to ensure the security of the Firefox browser.