[ASA-201801-16] bind: denial of service

[Levente Polyak]

Arch Linux Security Advisory ASA-201801-16
==========================================

Severity: High
Date    : 2018-01-18
CVE-ID  : CVE-2017-3145
Package : bind
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-589

Summary
=======

The package bind before version 9.11.2.P1-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 9.11.2.P1-1.

# pacman -Syu "bind>=9.11.2.P1-1"

The problem has been fixed upstream in version 9.11.2.P1.

Workaround
==========

None.

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

A use-after-free flaw leading to denial of service was found in the way
BIND before 9.11.2.P1, 9.10.6-P1 and 9.9.11-P1 internally handled
cleanup operations on upstream recursion fetch contexts. A remote
attacker could potentially use this flaw to make named, acting as a
DNSSEC validating resolver, exit unexpectedly with an assertion failure
via a specially crafted DNS request.

Impact
======

A remote attacker is able to crash named while acting as a DNSSEC
validating resolver via a specially crafted DNS request.

References
==========

https://kb.isc.org/article/AA-01542
https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=commitdiff;h=053b51c4dbd28f6e4de71ce4268a6f606025d76d
https://security.archlinux.org/CVE-2017-3145

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