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ISC BIND DoS Vulnerability (CVE-2020-8619) - Linux

Information

Severity

Severity

Medium

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

4.0

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Patch

Created

Created

11 months ago

Modified

Modified

11 months ago

Summary

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

Insight

Insight

The asterisk character ('*') is allowed in DNS zone files, where it is most commonly present as a wildcard at a terminal node of the Domain Name System graph. However, the RFCs do not require and BIND does not enforce that an asterisk character be present only at a terminal node. A problem can occur when an asterisk is present in an empty non-terminal location within the DNS graph. If such a node exists, after a series of queries, named can reach an inconsistent state that results in the failure of an assertion check in rbtdb.c, followed by the program exiting due to the assertion failure.

Affected Software

Affected Software

BIND 9.11.14 through 9.11.19, 9.14.9 through 9.14.12, 9.16.0 through 9.16.3 and 9.11.14-S1 through 9.11.19-S1.

Detection Method

Detection Method

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

Solution

Solution

Update to version 9.11.20, 9.16.4, 9.11.20-S1 or later.

Common Vulnerabilities and Exposures (CVE)