#VU55681 Resource management error in Firefox for Android - CVE-2021-29983

Vulnerability identifier: #VU55681

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-29983

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Firefox for Android
Mobile applications / Apps for mobile phones

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to perform clickjacking attack.

The vulnerability exists due to improper management of internal resources within the application. Firefox for Android can get stuck in fullscreen mode and not exit it even after normal interactions that should cause it to exit. A remote attacker can abuse this to trick the victim into revealing sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Firefox for Android: 80.1.2 - 90.1.3

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2021-33/

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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.