[gentoo-announce] [ GLSA 200809-02 ] dnsmasq: Denial of Service and DNS spoofing

[news 28]

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Gentoo Linux Security Advisory GLSA 200809-02

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http://security.gentoo.org/

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Severity: Normal

Title: dnsmasq: Denial of Service and DNS spoofing

Date: September 04, 2008

Bugs: #231282, #232523

ID: 200809-02

 

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Synopsis

========

 

Two vulnerabilities in dnsmasq might allow for a Denial of Service or

spoofing of DNS replies.

 

Background

==========

 

Dnsmasq is a lightweight and easily-configurable DNS forwarder and DHCP

server.

 

Affected packages

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

 

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

Package / Vulnerable / Unaffected

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

1 net-dns/dnsmasq < 2.45 >= 2.45

 

Description

===========

 

* Dan Kaminsky of IOActive reported that dnsmasq does not randomize

UDP source ports when forwarding DNS queries to a recursing DNS

server (CVE-2008-1447).

 

* Carlos Carvalho reported that dnsmasq in the 2.43 version does not

properly handle clients sending inform or renewal queries for unknown

DHCP leases, leading to a crash (CVE-2008-3350).

 

Impact

======

 

A remote attacker could send spoofed DNS response traffic to dnsmasq,

possibly involving generating queries via multiple vectors, and spoof

DNS replies, which could e.g. lead to the redirection of web or mail

traffic to malicious sites. Furthermore, an attacker could generate

invalid DHCP traffic and cause a Denial of Service.

 

Workaround

==========

 

There is no known workaround at this time.

 

Resolution

==========

 

All dnsmasq users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.45"

 

References

==========

 

[ 1 ] CVE-2008-3350

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3350

[ 2 ] 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-200809-02.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