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From: Marc Deslauriers <marc.deslauriers@canonical.com>
Reply-To: Ubuntu Security <security@ubuntu.com>
To: "ubuntu-security-announce@lists.ubuntu.com"
 <ubuntu-security-announce@lists.ubuntu.com>
Message-ID: <9c861412-2c46-3a33-0a50-3231a3a7f236@canonical.com>
Subject: [USN-6376-1] c-ares vulnerability

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==========================================================================
Ubuntu Security Notice USN-6376-1
September 18, 2023

c-ares vulnerability
==========================================================================

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

- Ubuntu 20.04 LTS

Summary:

c-ares could be made to crash if it received specially crafted network
traffic.

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

Details:

It was discovered that c-ares incorrectly parsed certain SOA replies. A
remote attacker could possibly use this issue to cause c-res to crash,
resulting in a denial of service.

Update instructions:

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

Ubuntu 20.04 LTS:
   libc-ares2                      1.15.0-1ubuntu0.4

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

References:
   https://ubuntu.com/security/notices/USN-6376-1
   CVE-2020-22217

Package Information:
   https://launchpad.net/ubuntu/+source/c-ares/1.15.0-1ubuntu0.4

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