CVE-2016-7069 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5