Vulnerability identifier: #VU7959

Vulnerability risk: Critical

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-798

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Social Fixer (Chrome extension)
Client/Desktop applications / Plugins for browsers, ActiveX components

Vendor: Social Fixer

Description
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.

Mitigation
Update to version 20.2.0 or later.

Vulnerable software versions

Social Fixer (Chrome extension): 20.1.1

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.