Backdoor in Social Fixer (Chrome extension) - #VU7959

Vulnerability identifier: #VU7959

CSH Severity: Critical

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: N/A

CWE-ID: CWE-798

Exploitation vector: Remote access

Exploit availability: The vulnerability is being exploited in the wild

The vulnerability allows a remote attacker to gain unauthorized access to victim's browser.

The vulnerability exists due to presence of backdoor code in Social Fixer Google Chrome extension 20.1.1, distributed via Google Web Store.

Social Fixer (Chrome extension)

Update to version 20.2.0 or later.

• https://www.proofpoint.com/us/threat-insight/post/threat-actor-goes-chrome-extension-hijacking-spree
• https://www.facebook.com/socialfixer/posts/10155117415829342

• Backdoor in Social Fixer Google Chrome extension