Debian Security Advisory
DSA-3764-1 pdns -- security update
- Date Reported:
- 13 Jan 2017
- Affected Packages:
- Security database references:
- In Mitre's CVE dictionary: CVE-2016-2120, CVE-2016-7068, CVE-2016-7072, CVE-2016-7073, CVE-2016-7074.
- More information:
Multiple vulnerabilities have been discovered in pdns, an authoritative DNS server. The Common Vulnerabilities and Exposures project identifies the following problems:
Mathieu Lafon discovered that pdns does not properly validate records in zones. An authorized user can take advantage of this flaw to crash server by inserting a specially crafted record in a zone under their control and then sending a DNS query for that record.
Florian Heinz and Martin Kluge reported that pdns parses all records present in a query regardless of whether they are needed or even legitimate, allowing a remote, unauthenticated attacker to cause an abnormal CPU usage load on the pdns server, resulting in a partial denial of service if the system becomes overloaded.
Mongo discovered that the webserver in pdns is susceptible to a denial-of-service vulnerability, allowing a remote, unauthenticated attacker to cause a denial of service by opening a large number of TCP connections to the web server.
- CVE-2016-7073 /
Mongo discovered that pdns does not sufficiently validate TSIG signatures, allowing an attacker in position of man-in-the-middle to alter the content of an AXFR.
For the stable distribution (jessie), these problems have been fixed in version 3.4.1-4+deb8u7.
For the unstable distribution (sid), these problems have been fixed in version 4.0.2-1.
We recommend that you upgrade your pdns packages.