Vulnerability Details

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

Published: 2021-09-06 11:24:45
CVE Author: NIST National Vulnerability Database

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

severity_vector=CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

severity_origin=NVD

severity_date=2020-10-20 12:15:00 +0000 (Tue, 20 Oct 2020)

Detection Type:
Remote Banner

Solution Type:
Vendor Patch

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

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

Technical Details:
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.

Impact:
Unless a nameserver is providing authoritative service for one or more zones and at least one zone contains an empty non-terminal entry containing an asterisk ('*') character, this defect cannot be encountered. A would-be attacker who is allowed to change zone content could theoretically introduce such a record in order to exploit this condition to cause denial of service, though we consider the use of this vector unlikely because any such attack would require a significant privilege level and be easily traceable.

Affected Versions:
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.

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

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2020-8619

References:

https://kb.isc.org/docs/cve-2020-8619

Severity
Medium
CVSS Score
4.0
Published
2021-09-06
Modified
2021-09-07
Category
Denial of Service

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