An issue has been found in dnsdist before 1.2.0 in...

Vulnerability Description

An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are handled when parsing responses from a backend. When dnsdist is configured to add EDNS Client Subnet to a query, the response may contain an EDNS0 OPT record that has to be removed before forwarding the response to the initial client. On a 32-bit system, the pointer arithmetic used when parsing the received response to remove that record might trigger an undefined behavior leading to a crash.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-7069
• http://www.securityfocus.com/bid/100509
• https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2017-01.html