CVE-2020-26973 : Security Advisory and Response

Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

Understanding CVE-2020-26973

This CVE involves a vulnerability in the CSS Sanitizer that could potentially lead to a sanitizer bypass in specific versions of Mozilla products.

What is CVE-2020-26973?

The vulnerability arises from incorrect sanitization by the CSS Sanitizer, allowing certain input to confuse the sanitizer and remove components incorrectly, potentially leading to a bypass.

The Impact of CVE-2020-26973

The vulnerability could be exploited to bypass the CSS Sanitizer, impacting the security and integrity of affected Mozilla products.

Technical Details of CVE-2020-26973

This section provides more technical insights into the vulnerability.

Vulnerability Description

The CSS Sanitizer incorrectly removes components due to certain input, creating a potential bypass opportunity.

Affected Systems and Versions

Firefox < 84
Thunderbird < 78.6
Firefox ESR < 78.6

Exploitation Mechanism

The vulnerability could be exploited by providing specific input to confuse the CSS Sanitizer, leading to incorrect component removal.

Mitigation and Prevention

To address CVE-2020-26973, follow these mitigation strategies:

Immediate Steps to Take

Update Firefox, Thunderbird, and Firefox ESR to versions 84, 78.6, and 78.6 respectively.
Monitor for any unusual activities that might indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update software to the latest versions to patch known vulnerabilities.
Implement secure coding practices to prevent similar issues in the future.

Patching and Updates

Apply patches provided by Mozilla promptly to fix the vulnerability and enhance system security.