CVE-2023-5171 Use after free in Firefox
A use-after-free in Firefox's Ion compiler allows attackers to write NUL bytes, potentially causing crashes or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-5171?
CVE-2023-5171 is a medium-severity use after free vulnerability in Debian Debian Linux, published on 27 Sep 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
During Ion compilation, a Garbage Collection could have resulted in a use-after-free condition, allowing an attacker to write two NUL bytes, and cause a potentially exploitable crash. This vulnerability affects Firefox < 118, Firefox ESR < 115.3, and Thunderbird < 115.3.
Weakness: CWE-416
Which versions are affected by CVE-2023-5171?
It affects 5 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2023-5171?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2023-5171 being exploited?
There is no known exploitation of CVE-2023-5171 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2023-5171, GHSA-v567-j6g5-phvx, UBUNTU-CVE-2023-5171.