CVE-2020-15678 : Security Advisory and Response

A use-after-free vulnerability affecting Firefox, Thunderbird, and Firefox ESR versions less than specified.

Understanding CVE-2020-15678

This CVE involves a use-after-free vulnerability in Mozilla products.

What is CVE-2020-15678?

When scrolling through graphical layers, an iterator may become invalid, leading to a potential use-after-free scenario due to improper iterator handling in Mozilla products.

The Impact of CVE-2020-15678

This vulnerability affects users of Firefox, Thunderbird, and Firefox ESR versions less than specified, potentially allowing attackers to execute arbitrary code.

Technical Details of CVE-2020-15678

Details about the vulnerability in Mozilla products.

Vulnerability Description

The issue arises from improper handling of iterators in the APZCTreeManager::ComputeClippedCompositionBounds function, leading to a use-after-free vulnerability.

Affected Systems and Versions

Firefox < 81
Thunderbird < 78.3
Firefox ESR < 78.3

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious webpage, tricking users into visiting it, and executing arbitrary code on the affected system.

Mitigation and Prevention

Ways to mitigate and prevent exploitation of CVE-2020-15678.

Immediate Steps to Take

Update Firefox, Thunderbird, and Firefox ESR to versions equal to or greater than 81, 78.3, and 78.3 respectively.
Avoid clicking on suspicious links or visiting untrusted websites.
Implement security best practices to reduce the risk of exploitation.

Long-Term Security Practices

Regularly update software to the latest versions to patch known vulnerabilities.
Educate users about safe browsing habits and the importance of software updates.

Patching and Updates

Stay informed about security advisories from Mozilla and apply patches promptly to secure systems.