pdnsd: Denial of Service and potential arbitrary code execution

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200605-10 / pdnsd
Release Date	May 10, 2006
Latest Revision	May 10, 2006: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-dns/pdnsd	< 1.2.4	>= 1.2.4	All supported architectures

Related bugreports: #131341

Synopsis

pdnsd is vulnerable to a buffer overflow that may result in arbitrary code execution.

2. Impact Information

Background

pdnsd is a proxy DNS server with permanent caching that is designed to cope with unreachable DNS servers.

Description

The pdnsd team has discovered an unspecified buffer overflow vulnerability. The PROTOS DNS Test Suite, by the Oulu University Secure Programming Group (OUSPG), has also revealed a memory leak error within the handling of the QTYPE and QCLASS DNS queries, leading to consumption of large amounts of memory.

Impact

An attacker can craft malicious DNS queries leading to a Denial of Service, and potentially the execution of arbitrary code.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All pdnsd users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/pdnsd-1.2.4-r1"

4. References

Page updated May 10, 2006

Summary: This is a Gentoo Linux Security Advisory

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