#VU91732 Security features bypass in Firefox ESR and Mozilla Firefox - CVE-2024-5692

Vulnerability identifier: #VU91732

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-5692

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

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

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to an error when parsing file names using the Save As functionality on Windows 10. A remote attacker can trick the victim into saving the file with a disallowed extension such as .url by including an invalid character in the extension.

Note, the vulnerability affects only Windows installations of Firefox.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Firefox ESR: 102.0 - 102.15.1, 115.0 - 115.11.0

Mozilla Firefox: 100.0 - 126.0.1

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External links
https://bugzilla.mozilla.org/show_bug.cgi?id=1837514
https://bugzilla.mozilla.org/show_bug.cgi?id=1891234
https://www.mozilla.org/security/advisories/mfsa2024-25/
https://www.mozilla.org/security/advisories/mfsa2024-26/

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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.