Arch Linux ASA-202108-13 Medium: c-ares Insufficient Validation Risk

Arch Linux Security Advisory ASA-202108-13
=========================================
Severity: Medium
Date    : 2021-08-10
CVE-ID  : CVE-2021-3672
Package : c-ares
Type    : insufficient validation
Remote  : Yes
Link    : https://security.archlinux.org/AVG-2268

Summary
======
The package c-ares before version 1.17.2-1 is vulnerable to
insufficient validation.

Resolution
=========
Upgrade to 1.17.2-1.

# pacman -Syu "c-ares>=1.17.2-1"

The problem has been fixed upstream in version 1.17.2.

Workaround
=========
None.

Description
==========
Missing input validation of host names returned by Domain Name Serversin the c-ares library before version 1.17.2 can lead to output of wrong
hostnames (leading to domain hijacking).

Impact
=====
A remote attacker with the ability to create DNS entries could create
crafted entries that output the wrong hostname when resolved with
c-ares, leading to potential domain hijacking.

References
=========
https://c-ares.org/adv_20210810.html
https://github.com/c-ares/c-ares/commit/362f91d807d293791008cdb7616d40f7784ece83
https://github.com/c-ares/c-ares/commit/44c009b8e62ea1929de68e3f438181bea469ec14
https://security.archlinux.org/CVE-2021-3672