USN-6164-2: c-ares vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• c-ares - library for asynchronous name resolution

Details

USN-6164-1 fixed several vulnerabilities in c-ares. This update provides
the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

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.
(CVE-2023-31130)

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 18.04

• libc-ares2 - 1.14.0-1ubuntu0.2+esm1
  Available with Ubuntu Pro

Ubuntu 16.04

• libc-ares2 - 1.10.0-3ubuntu0.2+esm2
  Available with Ubuntu Pro

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

References

• CVE-2023-32067
• CVE-2023-31130

Related notices

• USN-6164-1: libc-ares-dev, c-ares, libc-ares2