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MaraDNS: Denial of Service


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 201202-03 / maradns
Release Date February 22, 2012
Latest Revision February 22, 2012: 1
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-dns/maradns < 1.4.09 >= 1.4.09 All supported architectures

Related bugreports: #397431


A hash collision vulnerability in MaraDNS allows remote attackers to cause a Denial of Service condition.

2.  Impact Information


MaraDNS is a proxy DNS server with permanent caching.


MaraDNS does not properly randomize hash functions to protect against hash collision attacks.


A remote attacker could send many specially crafted DNS recursive queries, possibly resulting in a Denial of Service condition.

3.  Resolution Information


There is no known workaround at this time.


All MaraDNS users should upgrade to the latest version:

Code Listing 3.1: Resolution

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-dns/maradns-1.4.09"

4.  References


Page updated February 22, 2012

Summary: This is a Gentoo Linux Security Advisory

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