Vulnerability identifier: #VU15962
Vulnerability risk: Low
Exploitation vector: Network
Exploit availability: No
Vendor: PowerDNS.COM B.V.
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to an error if the parent zone is signed, and all the authoritative servers for that parent zone answer with FORMERR to a query for at least one of the meta-types. A remote attacker can send a DNS query for a meta-type like OPT, lead to a zone being wrongly cached as failing DNSSEC validation and cause subsequent queries from clients to request DNSSEC validation answered with a ServFail.
The vulnerability has been fixed in the versions 4.1.5.
Vulnerable software versions
PowerDNS Recursor: 4.1.0 - 4.1.4, 4.0.0 - 4.0.9
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.