CVE-2023-32067 (c-ares, fedora)

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.

ares asynchronous cve denial of service fedora issue length library malformed packet query resolver service shutdown target udp vulnerable