[gentoo-announce] [ GLSA 200807-08 ] BIND: Cache poisoning

[news 28]

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Gentoo Linux Security Advisory GLSA 200807-08

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

http://security.gentoo.org/

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 

Severity: High

Title: BIND: Cache poisoning

Date: July 11, 2008

Bugs: #231201

ID: 200807-08

 

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 

Synopsis

========

 

A weakness in the DNS protocol has been reported, which could lead to

cache poisoning on recursive resolvers.

 

Background

==========

 

ISC BIND is the Internet Systems Consortium implementation of the

Domain Name System (DNS) protocol.

 

Affected packages

=================

 

-------------------------------------------------------------------

Package / Vulnerable / Unaffected

-------------------------------------------------------------------

1 net-dns/bind < 9.4.2_p1 >= 9.4.2_p1

 

Description

===========

 

Dan Kaminsky of IOActive has reported a weakness in the DNS protocol

related to insufficient randomness of DNS transaction IDs and query

source ports.

 

Impact

======

 

An attacker could exploit this weakness to poison the cache of a

recursive resolver and thus spoof DNS traffic, which could e.g. lead to

the redirection of web or mail traffic to malicious sites.

 

Workaround

==========

 

There is no known workaround at this time.

 

Resolution

==========

 

All BIND users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=net-dns/bind-9.4.2_p1"

 

Note: In order to utilize the query port randomization to mitigate the

weakness, you need to make sure that your network setup allows the DNS

server to use random source ports for query and that you have not set a

fixed query port via the "query-source port" directive in the BIND

configuration.

 

References

==========

 

[ 1 ] CVE-2008-1447

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1447

 

Availability

============

 

This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:

 

http://security.gentoo.org/glsa/glsa-200807-08.xml

 

Concerns?

=========

 

Security is a primary focus of Gentoo Linux and ensuring the

confidentiality and security of our users machines is of utmost

importance to us. Any security concerns should be addressed to

security ( -at -) gentoo.org or alternatively, you may file a bug at

http://bugs.gentoo.org.

 

License

=======

 

Copyright 2008 Gentoo Foundation, Inc; referenced text

belongs to its owner(s).

 

The contents of this document are licensed under the

Creative Commons - Attribution / Share Alike license.

 

http://creativecommons.org/licenses/by-sa/2.5