[ASA-201811-21] powerdns-recursor: denial of service

[Remi Gacogne]

Arch Linux Security Advisory ASA-201811-21
==========================================

Severity: Medium
Date    : 2018-11-28
CVE-ID  : CVE-2018-16855
Package : powerdns-recursor
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-821

Summary
=======

The package powerdns-recursor before version 4.1.8-1 is vulnerable to
denial of service.

Resolution
==========

Upgrade to 4.1.8-1.

# pacman -Syu "powerdns-recursor>=4.1.8-1"

The problem has been fixed upstream in version 4.1.8.

Workaround
==========

None.

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

An issue has been found in PowerDNS Recursor versions from 4.1.0 up to
and including 4.1.7, where a remote attacker sending a DNS query can
trigger an out-of-bounds memory read while computing the hash of the
query for a packet cache lookup, possibly leading to a crash.

Impact
======

A remote attacker can cause a denial of service via a crafted query.

References
==========

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2018-09.html
https://seclists.org/oss-sec/2018/q4/183
https://github.com/PowerDNS/pdns/commit/e412a949491886c13854587bbd06fa90ceb3a326
https://security.archlinux.org/CVE-2018-16855

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