Use-after-free in Mozilla Firefox and Firefox ESR - CVE-2020-26959

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the WebRequestService component during browser shutdown. A remote attacker can create a specially crafted web page, trick the victim into visiting it, force the victim to shutdown the browser, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Remediation

External links

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
• https://www.mozilla.org/en-US/security/advisories/mfsa2020-51/