GLSA-200801-16 : MaraDNS: CNAME Denial of Service
Medium Nessus Plugin ID 30128
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-200801-16 (MaraDNS: CNAME Denial of Service)
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.
SolutionAll MaraDNS users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=net-dns/maradns-1.2.12.09'