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ISC BIND DoS Vulnerability (CVE-2020-8619) - Linux
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
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.