#VU18033 Memory corruption in Mozilla Firefox - CVE-2019-9794

Vulnerability identifier: #VU18033

Vulnerability risk: High

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-9794

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 compromise vulnerable system.

The vulnerability exists due to improper validation of command line arguments within the URI handler when opening documents with Firefox. A remote attacker can trick the victim to open a file with a specially crafted filename and execute arbitrary commands on the system.

Note, this vulnerability can be exploited against Firefox installations on Windows operating system only.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 65.0.2

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/
https://bugzilla.mozilla.org/show_bug.cgi?id=1530103

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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.