Use-after-free in Mozilla Firefox and Firefox ESR - CVE-2017-5438

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to use-after-free error during XSLT processing due to the result handler being held by a freed handler during handling. A remote attacker can trigger memory corruption and execute arbitrary code on the target system.

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

How to mitigate CVE-2017-5438

Sources

• https://www.mozilla.org/en-US/security/advisories/mfsa2017-10/
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-11/
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-12/