CVE-2016-7068 Denial of service in pdns
Remote attackers can cause denial of service on PowerDNS servers by sending crafted DNS queries that trigger excessive CPU usage.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-7068?
CVE-2016-7068 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 11 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue has been found in PowerDNS before 3.4.11 and 4.0.2, and PowerDNS recursor before 3.7.4 and 4.0.4, allowing a remote, unauthenticated attacker to cause an abnormal CPU usage load on the PowerDNS server by sending crafted DNS queries, which might result in a partial denial of service if the system becomes overloaded. This issue is based on the fact that the PowerDNS server parses all records present in a query regardless of whether they are needed or even legitimate. A specially crafted query containing a large number of records can be used to take advantage of that behaviour.
Which versions are affected by CVE-2016-7068?
It affects 3 products.
Products include Debian Debian Linux, Powerdns Authoritative, Powerdns Recursor.
How do I fix CVE-2016-7068?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2016-7068 being exploited?
There is no known exploitation of CVE-2016-7068 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2016-7068, DLA-788-1, DSA-3763-1, GHSA-g832-5583-wc79, MGASA-2017-0036, UBUNTU-CVE-2016-7068.