CVE-2022-3559 Exim Regex use after free
A use-after-free vulnerability in Exim's regex handler allows attackers to potentially execute arbitrary code or cause a denial of service.
- 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-2022-3559?
CVE-2022-3559 is a medium-severity use after free vulnerability in Exim Exim, published on 17 Oct 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was found in Exim and classified as problematic. This issue affects some unknown processing of the component Regex Handler. The manipulation leads to use after free. The name of the patch is 4e9ed49f8f12eb331b29bd5b6dc3693c520fddc2. It is recommended to apply a patch to fix this issue. The identifier VDB-211073 was assigned to this vulnerability.
Which versions are affected by CVE-2022-3559?
It affects 2 products.
Linux distribution packages (5)
exim SUSE:Package Hub 15 SP3 | All versions | 4.94.2-bp153.5.1 |
exim SUSE:Package Hub 15 SP4 | All versions | 4.94.2-bp154.2.3.1 |
exim openSUSE:Leap 15.3 | All versions | 4.94.2-bp153.5.1 |
exim openSUSE:Leap 15.4 | All versions | 4.94.2-bp154.2.3.1 |
exim openSUSE:Tumbleweed | All versions | 4.96-3.1 |
Products include Exim Exim, Fedoraproject Fedora.
How do I fix CVE-2022-3559?
Apply the vendor's patch.
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-2022-3559 being exploited?
There is no known exploitation of CVE-2022-3559 in the wild and no public exploit code.
Other vulnerabilities in Exim Exim
Sources
Also known as CLSA-2023-1699908139, CLSA-2023-1699908687, DEBIAN-CVE-2022-3559, GHSA-86wj-xg3c-r8gx, UBUNTU-CVE-2022-3559, USN-5741-1 and 3 more.