c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.
CPE | Name | Operator | Version |
---|---|---|---|
c-ares | lt | 1.19.1 | |
debian_linux | eq | 10.0 | |
debian_linux | eq | 11.0 | |
fedora | eq | 37 | |
fedora | eq | 38 |
github.com/c-ares/c-ares/releases/tag/cares-1_19_1
github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vc
lists.debian.org/debian-lts-announce/2023/06/msg00034.html
lists.fedoraproject.org/archives/list/[email protected]/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/
lists.fedoraproject.org/archives/list/[email protected]/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/
security.gentoo.org/glsa/202310-09
www.debian.org/security/2023/dsa-5419