Debian Security Advisory

DSA-4954-1 c-ares -- security update

Date Reported:
10 Aug 2021
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 992053.
In Mitre's CVE dictionary: CVE-2021-3672.
More information:

Philipp Jeitner and Haya Shulman discovered a flaw in c-ares, a library that performs DNS requests and name resolution asynchronously. Missing input validation of hostnames returned by DNS servers can lead to output of wrong hostnames (leading to Domain Hijacking).

For the stable distribution (buster), this problem has been fixed in version 1.14.0-1+deb10u1.

We recommend that you upgrade your c-ares packages.

For the detailed security status of c-ares please refer to its security tracker page at: