Vulnerability identifier: #VU74821

Vulnerability risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-29532

CWE-ID: CWE-264

Exploitation vector: Local

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 local user to escalate privileges on the system.

The vulnerability exists due to the way Mozilla Maintenance Service handles write-locks when downloading updates from a SMB server. A local user can apply an unsigned update file by pointing the service at an update file on a malicious SMB server.

The vulnerability affects only Firefox for Windows.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 100.0 - 111.0.1

Firefox ESR: 102.0 - 102.9.0

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2023-13/
http://www.mozilla.org/en-US/security/advisories/mfsa2023-14/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.