UBUNTU-CVE-2016-7069

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UBUNTU-CVE-2016-7069

Summary:

Details: 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://ubuntu.com/security/CVE-2016-7069, https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2017-01.html, https://downloads.powerdns.com/patches/2017-01, https://www.cve.org/CVERecord?id=CVE-2016-7069