Vulnerability identifier: #VU59367

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-22743

CWE-ID: CWE-1021

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 perform spoofing attack.

The vulnerability exists due to an error when navigating from inside an iframe while requesting fullscreen access. A remote attacker can trick the victim to open a specially crafted web page,  and make the browser unable to leave fullscreen mode.

Successful exploitation of the vulnerability may allow an attacker to perform spoofing attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 80.0 - 95.0.2

Firefox ESR: 91.0.1 - 91.4.1

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2022-01/
http://www.mozilla.org/en-US/security/advisories/mfsa2022-02/

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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.