A c-ares security update has been released for Ubuntu Linux 20.04 LTS., 22.04 LTS, 22.10, and 23.04.

[USN-6164-1] c-ares vulnerabilities

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

c-ares vulnerabilities
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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

Summary:

Several security issues were fixed in c-ares.

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

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 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.

References:
https://ubuntu.com/security/notices/USN-6164-1
CVE-2023-31130, CVE-2023-32067

Package Information:
https://launchpad.net/ubuntu/+source/c-ares/1.18.1-2ubuntu0.1
https://launchpad.net/ubuntu/+source/c-ares/1.18.1-1ubuntu0.22.10.2
https://launchpad.net/ubuntu/+source/c-ares/1.18.1-1ubuntu0.22.04.2
https://launchpad.net/ubuntu/+source/c-ares/1.15.0-1ubuntu0.3