Ubuntu alert USN-5034-1 (c-ares)

From:
             
 
Marc Deslauriers <marc.deslauriers@canonical.com>
To:
             
 
"ubuntu-security-announce@lists.ubuntu.com" <ubuntu-security-announce@lists.ubuntu.com>
Subject:
             
 
[USN-5034-1] c-ares vulnerability
Date:
             
 
Tue, 10 Aug 2021 08:30:53 -0400
Message-ID:
             
 
<04991e06-f830-d597-30b6-b3c19ed54e68@canonical.com>
==========================================================================
Ubuntu Security Notice USN-5034-1
August 10, 2021

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

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

- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

c-ares could be made to return wrong domains.

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

Details:

Philipp Jeitner and Haya Shulman discovered that c-ares incorrectly
validated certain hostnames returned by DNS servers. A remote attacker
could possibly use this issue to perform Domain Hijacking attacks.

Update instructions:

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

Ubuntu 21.04:
  libc-ares2                      1.17.1-1ubuntu0.1

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

Ubuntu 18.04 LTS:
  libc-ares2                      1.14.0-1ubuntu0.1

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

References:
  https://ubuntu.com/security/notices/USN-5034-1
  CVE-2021-3672

Package Information:
  https://launchpad.net/ubuntu/+source/c-ares/1.17.1-1ubunt...
  https://launchpad.net/ubuntu/+source/c-ares/1.15.0-1ubunt...
  https://launchpad.net/ubuntu/+source/c-ares/1.14.0-1ubunt...

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