[arch-security] [ASA-201512-10] bind: denial of service

[Levente Polyak]

Arch Linux Security Advisory ASA-201512-10
==========================================

Severity: High
Date    : 2015-12-16
CVE-ID  : CVE-2015-8000
Package : bind
Type    : denial of service
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package bind before version 9.10.3.P2-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 9.10.3.P2-1.

# pacman -Syu "bind>=9.10.3.P2-1"

The problem has been fixed upstream in version 9.10.3.P2.

Workaround
==========

None.

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

An error in the parsing of incoming responses allows some records with
an incorrect class to be accepted by BIND instead of being rejected as
malformed. This can trigger a REQUIRE assertion failure when those
records are subsequently cached. Intentional exploitation of this
condition is possible and could be used as a denial-of-service vector
against servers performing recursive queries.

An attacker who can cause a server to request a record with a malformed
class attribute can use this bug to trigger a REQUIRE assertion in db.c,
causing named to exit and denying service to clients. The risk to
recursive servers is high. Authoritative servers are at limited risk if
they perform authentication when making recursive queries to resolve
addresses for servers listed in NS RRSETs.

Impact
======

A remote attacker is able to send specially crafted packets to crash the
bind process leading to denial of service.

References
==========

https://access.redhat.com/security/cve/CVE-2015-8000
https://kb.isc.org/article/AA-01317

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