Vulnerability identifier: #VU52339

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-24000

CWE-ID: CWE-362

Exploitation vector: Network

Exploit availability: No

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

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to perform clickjacking attack.

The vulnerability exists due to a race condition within requestPointerLock() and setTimeout() methods in conjunctions with certain elements, such as <input type="file">. A remote attacker can create a specially crafted web page that will result in a situation where a user interacting with one tab when they believed they were on a separate tab and gain access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 80.0 - 87.0

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CPE

• cpe:2.3:a:mozilla:mozilla_firefox:87.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:86.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:86.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:85.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:85.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:85.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:84.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:84.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:84.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:83.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:82.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:82.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:82.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:82.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:81.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:81.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:81.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:80.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_firefox:80.0:*:*:*:*:*:*:*

External links
http://www.mozilla.org/en-US/security/advisories/mfsa2021-16/

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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.