GLSA 200809-02: dnsmasq: Denial of Service and DNS spoofing

http://security.gentoo.org/

Severity:	normal
Title:	dnsmasq: Denial of Service and DNS spoofing
Date:	09/04/2008
Bugs:	#231282, #232523
ID:	200809-02

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	Architecture(s)
net-dns/dnsmasq	< 2.45	>= 2.45	All supported architectures

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

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@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.