[ASA-202011-18] c-ares: denial of service

[Morten Linderud]

Arch Linux Security Advisory ASA-202011-18
==========================================

Severity: Medium
Date    : 2020-11-19
CVE-ID  : CVE-2020-8277
Package : c-ares
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1280

Summary
=======

The package c-ares before version 1.17.1-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 1.17.1-1.

# pacman -Syu "c-ares>=1.17.1-1"

The problem has been fixed upstream in version 1.17.1.

Workaround
==========

None.

Description
===========

An application that allows an attacker to trigger a DNS request for a
host of their choice could trigger a Denial of Service by getting the
application to resolve a DNS record with a large number of responses.

Impact
======

A remote malicious attacker might be able to crash the application with
a crafted DNS response.

References
==========

https://github.com/c-ares/c-ares/issues/371
https://github.com/c-ares/c-ares/commit/0d252eb3b2147179296a3bdb4ef97883c97c54d3
https://security.archlinux.org/CVE-2020-8277
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