Use-after-free in Firefox ESR and Mozilla Firefox - CVE-2019-17011

Detailed vulnerability description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when retrieving a document from a DocShell in the antitracking code. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a race condition that will results in a use-after-free error.

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

How to mitigate CVE-2019-17011

Sources

• https://www.mozilla.org/en-US/security/advisories/mfsa2019-36/
• https://www.mozilla.org/en-US/security/advisories/mfsa2019-37/