Debian Security Advisory
DLA-627-1 pdns -- LTS security update
- Date Reported:
- 18 Sep 2016
- Affected Packages:
- Security database references:
- In the Debian bugtracking system: Bug 830808.
In Mitre's CVE dictionary: CVE-2016-5426, CVE-2016-5427, CVE-2016-6172.
- More information:
Multiple vulnerabilities have been discovered in pdns, an authoritative DNS server. The Common Vulnerabilities and Exposures project identifies the following problems:
- CVE-2016-5426 /
Florian Heinz and Martin Kluge reported that the PowerDNS Authoritative Server accepts queries with a qname's length larger than 255 bytes and does not properly handle dot inside labels. A remote, unauthenticated attacker can take advantage of these flaws to cause abnormal load on the PowerDNS backend by sending specially crafted DNS queries, potentially leading to a denial of service.
It was reported that a malicious primary DNS server can crash a secondary PowerDNS server due to improper restriction of zone size limits. This update adds a feature to limit AXFR sizes in response to this flaw.
For Debian 7
Wheezy, these problems have been fixed in version 3.1-4.1+deb7u2.
We recommend that you upgrade your pdns packages.
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS
- CVE-2016-5426 / CVE-2016-5427