GLSA 200801-16: MaraDNS: CNAME Denial of Service
| Severity: | normal |
| Title: | MaraDNS: CNAME Denial of Service |
| Date: | 01/29/2008 |
| Bugs: | |
| ID: | 200801-16 |
Synopsis
MaraDNS is prone to a Denial of Service vulnerability impacting CNAME resolution.Background
MaraDNS is a package that implements the Domain Name Service (DNS) with resolver and caching ability.
Affected packages
| Package | Vulnerable | Unaffected | Architecture(s) |
|---|---|---|---|
| net-dns/maradns | < 1.2.12.08 | >= 1.2.12.08 | All supported architectures |
Description
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".
Impact
A remote attacker could send specially crafted DNS packets to a vulnerable server, making it unable to resolve CNAME records.
Workaround
Add "max_ar_chain = 2" to the "marac" configuration file.
Resolution
All MaraDNS users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/maradns-1.2.12.09"
References
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
Concerns?
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
License
Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.