MaraDNS: Denial of Service

1. Gentoo Linux Security Advisory

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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