[USN-6164-1] c-ares vulnerabilities

Marc Deslauriers marc.deslauriers at canonical.com
Wed Jun 14 14:17:53 UTC 2023

Ubuntu Security Notice USN-6164-1
June 14, 2023

c-ares vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04
- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS


Several security issues were fixed in c-ares.

Software Description:
- c-ares: library for asynchronous name resolution


Hannes Moesl discovered that c-ares incorrectly handled certain ipv6
addresses. An attacker could use this issue to cause c-ares to crash,
resulting in a denial of service, or possibly execute arbitrary code.

Xiang Li discovered that c-ares incorrectly handled certain UDP packets. A
remote attacker could possibly use this issue to cause c-res to crash,
resulting in a denial of service. (CVE-2023-32067)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 23.04:
   libc-ares2                      1.18.1-2ubuntu0.1

Ubuntu 22.10:
   libc-ares2                      1.18.1-1ubuntu0.22.10.2

Ubuntu 22.04 LTS:
   libc-ares2                      1.18.1-1ubuntu0.22.04.2

Ubuntu 20.04 LTS:
   libc-ares2                      1.15.0-1ubuntu0.3

In general, a standard system update will make all the necessary changes.

   CVE-2023-31130, CVE-2023-32067

Package Information:

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