CVE-2022-3620 Exim DMARC dmarc.c dmarc_dns_lookup use after free
Remote attackers can exploit a use-after-free flaw in Exim's DMARC handler to potentially execute code or cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-3620?
CVE-2022-3620 is a medium-severity use after free vulnerability in Exim Exim, published on 20 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was found in Exim and classified as problematic. This issue affects the function dmarc_dns_lookup of the file dmarc.c of the component DMARC Handler. The manipulation leads to use after free. The attack may be initiated remotely. The name of the patch is 12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-211919.
Which versions are affected by CVE-2022-3620?
It affects 2 products.
Products include Exim Exim, Fedoraproject Fedora.
How do I fix CVE-2022-3620?
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-2022-3620 being exploited?
There is no known exploitation of CVE-2022-3620 in the wild and no public exploit code.
Other vulnerabilities in Exim Exim
Sources
Also known as DEBIAN-CVE-2022-3620, GHSA-jcq6-47h7-2c66.