Mozilla Firefox Web Page Download Mark-Of-The-Web Protection Mechanism Failure Vulnerability
Vulnerability Details
This vulnerability allows remote attackers to bypass the Mark-Of-The-Web protection mechanism on affected installations of Mozilla Firefox. User interaction is required to exploit this vulnerability in that the target must perform a specific action on a malicious page.
The specific flaw exists within the web page download functionality. An attacker can abuse the functionality to create files without the Mark-Of-The-Web. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current user.
Additional Details
Mozilla has issued an update to correct this vulnerability. More details can be found at:
https://www.mozilla.org/en-US/security/advisories/mfsa2024-18/#CVE-2024-3863
Disclosure Timeline
- 2024-02-13 - Vulnerability reported to vendor
- 2025-07-29 - Coordinated public release of advisory
- 2025-07-29 - Advisory Updated
Credit
Eduardo Braun Prado
