#VU81128 Double Free in Mozilla Firefox and Firefox ESR - CVE-2023-5174

Vulnerability identifier: #VU81128

Vulnerability risk: Medium

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:Green]

CVE-ID: CVE-2023-5174

CWE-ID: CWE-415

Exploitation vector: Network

Exploit availability: No

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

Vendor: Mozilla

Description

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

The vulnerability exists due to a boundary error when spawning processes on Windows. A remote attacker can trigger a double free error and execute arbitrary code on the target system.

Note, the vulnerability affects Firefox installations on Windows when running in a non-standard configuration, such as when using "runas".

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 100.0 - 117.0.1

Firefox ESR: 102.0 - 102.15.1, 115.0 - 115.2.1

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2023-42/
https://www.mozilla.org/en-US/security/advisories/mfsa2023-41/

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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.