Spoofing attack in Mozilla Thunderbird

1) Input validation error

EUVDB-ID: #VU70147

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-46874

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a spoofing attack.

The vulnerability exists due to insufficient validation of long filenames during drag and drop actions, which causes filename truncation to a potentially malicious extension. A remote attacker can trick the victim to download a file with a long filename, which can be automatically truncated by the browser into an executable file.

Mitigation

Install update from vendor's website.

Note, it was previously reported that this vulnerability was patched in Thunderbird 102.6, however the patch was omitted by the vendor.

Vulnerable software versions

Mozilla Thunderbird: 102.0 - 102.6.0

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2022-54/

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.