Vulnerability identifier: #VU78855

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-4055

CWE-ID: CWE-371

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 tamper with HTTP requests.

The vulnerability exists due to a cookie jar overflow when the number of cookies per domain was exceeded in document.cookie. A remote attacker can tamper with HTTP request and force the browser to send requests with some cookies missing.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 100.0 - 115.0.3

Firefox ESR: 115.0 - 115.0.3, 102.0 - 102.13.0

Firefox for Android: 100.1.0 - 115.2.1

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2023-29/
http://www.mozilla.org/en-US/security/advisories/mfsa2023-31/
http://www.mozilla.org/en-US/security/advisories/mfsa2023-30/

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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.