Vulnerability identifier: #VU63875

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-2022-31739

CWE-ID: CWE-22

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 directory traversal attacks.

The vulnerability exists due to input validation error when saving downloaded files on Windows. A remote attacker can use the "%" character in filename to store data outside the intended directory using Windows environment variables, such as %HOMEPATH% or %APPDATA%.

The vulnerability affects Windows installations only.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Mozilla Firefox: 90.0 - 100.0.2

Firefox ESR: 91.0 - 91.9.1

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2022-20/
http://www.mozilla.org/en-US/security/advisories/mfsa2022-21/

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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.