#VU49023 Data handling in Mozilla Firefox and Firefox ESR


Published: 2020-12-15

Vulnerability identifier: #VU49023

Vulnerability risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-35112

CWE-ID: CWE-19

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 compromise the affected system.

The vulnerability exists due to the way Firefox processes downloaded files without extensions on Windows operating system. If a user downloaded a file lacking an extension on Windows, and then "Open"-ed it from the downloads panel, if there was an executable file in the downloads directory with the same name but with an executable extension (such as .bat or .exe) that executable would have been launched instead.

The vulnerability affects Windows installations only.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 83.0

Firefox ESR: 78.0 - 78.5.0, 68.0 - 68.12.0, 60.0 - 60.9.0


CPE

External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-54/
http://www.mozilla.org/en-US/security/advisories/mfsa2020-55/


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?


Latest bulletins with this vulnerability