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PowerDNS Insufficient Validation in the HTTP Remote Backend
Wednesday, 20 March 2019 12:00

An issue has been found in PowerDNS Authoritative Server when the HTTP remote backend is used in RESTful mode (without post=1 set), allowing a remote user to cause the HTTP backend to connect to an attacker-specified host instead of the configured one, via a crafted DNS query. This can be used to cause a denial of service by preventing the remote backend from getting a response, content spoofing if the attacker can time its own query so that subsequent queries will use an attacker-controlled HTTP server instead of the configured one, and possibly information disclosure if the Authoritative Server has access to internal servers. PowerDNS Authoritative up to and including 4.1.6 is affected. It is advised to upgrade to version 4.1.7 or 4.0.7.

 
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