Debian Security Advisory

DSA-5419-1 c-ares -- security update

Date Reported:
07 Jun 2023
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2023-31130, CVE-2023-32067.
More information:

Two vunerabilities were discovered in c-ares, an asynchronous name resolver library:

  • CVE-2023-31130

    ares_inet_net_pton() is found to be vulnerable to a buffer underflow for certain ipv6 addresses, in particular "0::00:00:00/2" was found to cause an issue. c-ares only uses this function internally for configuration purposes, however external usage for other purposes may cause more severe issues.

  • CVE-2023-32067

    Target resolver may erroneously interprets a malformed UDP packet with a lenght of 0 as a graceful shutdown of the connection, which could cause a denial of service.

For the stable distribution (bullseye), these problems have been fixed in version 1.17.1-1+deb11u3.

We recommend that you upgrade your c-ares packages.

For the detailed security status of c-ares please refer to its security tracker page at: