This security bulletin contains one medium risk vulnerability.
The vulnerability allows a remote attacker to perform cache poisoning attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause the cached records for a given name to be updated to the ‘Bogus’ DNSSEC validation state, instead of their actual DNSSEC ‘Secure’ state, via a DNS ANY query. This results in a denial of service for installations that always validate (dnssec=validate) and for clients requesting validation when on-demand validation is enabled (dnssec=process).Mitigation
Install updates from vendor's website.Vulnerable software versions
PowerDNS Recursor: 4.0.0 - 4.4.0 alpha1Fixed software versions
Q & A
Can this vulnerability be exploited remotely?
How the attacker can exploit this vulnerability?
Is there known malware, which exploits this vulnerability?