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:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/maradns-1.2.12.09"