[USN-5034-2] c-ares vulnerability
Paulo Flabiano Smorigo
pfsmorigo at canonical.com
Tue Aug 10 18:13:43 UTC 2021
Ubuntu Security Notice USN-5034-2
August 10, 2021
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 ESM
c-ares could be made to return wrong domains.
- c-ares: library for asynchronous name resolution
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.
The problem can be corrected by updating your system to the following
Ubuntu 16.04 ESM:
In general, a standard system update will make all the necessary changes.
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