MaraDNS: CNAME Denial of Service

MaraDNS: CNAME Denial of Service MaraDNS is prone to a Denial of Service vulnerability impacting CNAME resolution. maradns January 29, 2008 January 29, 2008: 01 204351 remote 1.2.12.08 1.2.12.08

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"

CVE-2008-0061 rbu falco falco