Ubuntu alert USN-5034-2 (c-ares)

From:
             
 
Paulo Flabiano Smorigo <pfsmorigo@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-5034-2] c-ares vulnerability
Date:
             
 
Tue, 10 Aug 2021 15:13:43 -0300
Message-ID:
             
 
<20210810181343.buk7sha3gflhjzo6@morty>
==========================================================================
Ubuntu Security Notice USN-5034-2
August 10, 2021

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

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

- Ubuntu 16.04 ESM

Summary:

c-ares could be made to return wrong domains.

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

Details:

USN-5034-1 fixed a vulnerability in c-ares. This update provides
the corresponding update for Ubuntu 16.04 ESM.

Original advisory 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 16.04 ESM:
  libc-ares2                      1.10.0-3ubuntu0.2+esm1

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

References:
  https://ubuntu.com/security/notices/USN-5034-2
  https://ubuntu.com/security/notices/USN-5034-1
  CVE-2021-3672
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