Joined: 12 May 2004
|Posted: Tue Jan 29, 2008 11:26 pm Post subject: [ GLSA 200801-16 ] MaraDNS: CNAME Denial of Service
|Gentoo Linux Security Advisory
Title: MaraDNS: CNAME Denial of Service (GLSA 200801-16)
Date: January 29, 2008
MaraDNS is prone to a Denial of Service vulnerability impacting CNAME resolution.
MaraDNS is a package that implements the Domain Name Service (DNS) with resolver and caching ability.
Vulnerable: < 1.2.12.08
Unaffected: >= 1.2.12.08
Architectures: All supported architectures
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"