CVE-2019-11736 Race condition in Firefox
A race condition in the Mozilla Maintenance Service allows local attackers to replace privileged executables, leading to privilege escalation on Windows systems.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-11736?
CVE-2019-11736 is a high-severity vulnerability in Mozilla Firefox, published on 27 Sep 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The Mozilla Maintenance Service does not guard against files being hardlinked to another file in the updates directory, allowing for the replacement of local files, including the Maintenance Service executable, which is run with privileged access. Additionally, there was a race condition during checks for junctions and symbolic links by the Maintenance Service, allowing for potential local file and directory manipulation to be undetected in some circumstances. This allows for potential privilege escalation by a user with unprivileged local access. <br>*Note: These attacks requires local system access and only affects Windows. Other operating systems are not affected.*. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.
Weakness: CWE-362
Which versions are affected by CVE-2019-11736?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Firefox Esr.
How do I fix CVE-2019-11736?
Upgrade to a fixed version.
Is CVE-2019-11736 being exploited?
There is no known exploitation of CVE-2019-11736 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-g4fc-6wpg-63m2, UBUNTU-CVE-2019-11736.