MaraDNS: CNAME Denial of Service
Gentoo Linux Security Advisory
||GLSA 200801-16 / maradns
||January 29, 2008
||January 29, 2008: 01
All supported architectures
MaraDNS is prone to a Denial of Service vulnerability impacting CNAME
MaraDNS is a package that implements the Domain Name Service (DNS) with
resolver and caching ability.
Michael Krieger reported that a specially crafted DNS could prevent an
authoritative canonical name (CNAME) record from being resolved because
of an "improper rotation of resource records".
A remote attacker could send specially crafted DNS packets to a
vulnerable server, making it unable to resolve CNAME records.
Add "max_ar_chain = 2" to the "marac" configuration file.
All MaraDNS users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/maradns-1.2.12.09"