#VU84566 Reliance on undefined behavior in Mozilla products - CVE-2023-6863

Vulnerability identifier: #VU84566

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-6863

CWE-ID: CWE-758

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers
Firefox ESR
Client/Desktop applications / Web browsers
Firefox for Android
Mobile applications / Apps for mobile phones

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to reliance on undefined behavior in ShutdownObserver(). A remote attacker can crash the browser.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 100.0 - 120.0.1

Firefox ESR: 102.0 - 102.15.1, 115.0 - 115.5.0

Firefox for Android: 66.0.4 - 120.1.1

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2023-54/
https://www.mozilla.org/en-US/security/advisories/mfsa2023-56/

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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.