MaraDNS: Arbitrary code execution

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 201111-06 / MaraDNS
Release Date	November 20, 2011
Latest Revision	November 20, 2011: 1
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-dns/maradns	< 1.4.06	>= 1.4.06	All supported architectures

Related bugreports: #352569

Synopsis

A buffer overflow vulnerability in MaraDNS allows remote attackers to execute arbitrary code or cause a Denial of Service.

2. Impact Information

Background

MaraDNS is a proxy DNS server with permanent caching.

Description

A long DNS hostname with a large number of labels could trigger a buffer overflow in the compress_add_dlabel_points() function of dns/Compress.c.

Impact

A remote unauthenticated attacker could execute arbitrary code or cause a Denial of Service.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All MaraDNS users should upgrade to the latest stable version:

Code Listing 3.1: Resolution

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-dns/maradns-1.4.06"

NOTE: This is a legacy GLSA. Updates for all affected architectures are available since February 12, 2011. It is likely that your system is already no longer affected by this issue.

4. References

CVE-2011-0520

Page updated November 20, 2011

Summary: This is a Gentoo Linux Security Advisory

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