Pointer Arithmetic Vulnerability in dnsdist before 1.2.0

CVE-2016-7069 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:N/A:P

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.

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