Vulnerability identifier: #VU20817

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11751

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers

Vendor: Mozilla

Description

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

The vulnerability exists due to improper sanitization of logging-related command line parameters, when launching Firefox from another application. A remote attacker can create a specially crafted link, trick the victim to click on the link within an external application (e.g. messenger application) and write a log file to arbitrary location on the system, such as "Startup" folder. As a result a remote attacker can execute arbitrary code on the system.

Note, this vulnerability affect only Windows users.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 66.0.2 - 68.0.2

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2019-25/

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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?

No. We are not aware of malware exploiting this vulnerability.