Use-after-free error in Mozilla Firefox - CVE-2017-7809

Vulnerability identifier: #VU7830

CSH Severity: High

CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-7809

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The weakness exists due to use-after-free error when an editor DOM node is deleted prematurely during tree traversal while still bound to the document. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability may result in system compromise.

Mozilla Firefox
Gentoo Linux
Debian Linux
Arch Linux
Red Hat Enterprise Linux for x86_64
Ubuntu
Mozilla Thunderbird

Update to version 55.0.

• https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/

• Multiple vulnerabilities in Mozilla Firefox
• Red Hat update for Mozilla Firefox
• Multiple vulnerabilities in Mozilla Thunderbird
• Arch Linux update for thunderbird
• Red Hat update for Mozilla Thunderbird
• Debian update for Mozilla Firefox
• Arch Linux update for firefox
• Ubuntu update for Thunderbird
• Ubuntu update for Firefox
• Ubuntu update for Ubufox
• Ubuntu update for Firefox
• Debian update for firefox-esr
• Gentoo update for Mozilla Firefox
• Gentoo update for Mozilla Thunderbird