Vulnerability identifier: #VU77942

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-37207

CWE-ID: CWE-357

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 spoofing attack.

The vulnerability exists due to the way fullscreen notifications are handled within the browser. A remote attacker can trick the victim to visit a specially crafted website that can obscure the fullscreen notification by using a URL with a scheme handled by an external program, such as a mailto URL, and perform spoofing attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 100.0 - 114.0.2

Firefox ESR: 102.0 - 102.12.0

Firefox for Android: 100.1.0 - 114.2.0

---

External links
http://www.mozilla.org/en-US/security/advisories/mfsa2023-23/
http://www.mozilla.org/en-US/security/advisories/mfsa2023-22/

---

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.