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ISC BIND DoS Vulnerability (CVE-2011-1907)

Information

Severity

Severity

Medium

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Patch

Created

Created

1 year ago

Modified

Modified

1 year ago

Summary

ISC BIND is prone to a denial of service (DoS) vulnerability.

Insight

Insight

BIND 9.8.0 introduced Response Policy Zones (RPZ), a mechanism for modifying DNS responses returned by a recursive server according to a set of rules which are either defined locally or imported from a reputation provider. In typical configurations, RPZ is used to force NXDOMAIN responses for untrusted names. It can also be used for RRset replacement, i.e., returning a positive answer defined by the response policy.

Affected Software

Affected Software

ISC BIND version 9.8.0 only. Note: Only BIND installations which are using the RPZ feature configured for RRset replacement are affected.

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

Update to version 9.8.0-P1 or later. As a workaround use RPZ only for forcing NXDOMAIN responses and not for RRset replacement.

Common Vulnerabilities and Exposures (CVE)