Test Kennung:	1.3.6.1.4.1.25623.1.0.146640
Kategorie:	Denial of Service
Titel:	ISC BIND DoS Vulnerability (CVE-2020-8619) - Linux
Zusammenfassung:	ISC BIND is prone to a denial of service (DoS) vulnerability.
Beschreibung:	Summary: ISC BIND is prone to a denial of service (DoS) vulnerability. Vulnerability 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. Vulnerability 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 Software/OS: 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. Solution: Update to version 9.11.20, 9.16.4, 9.11.20-S1 or later. CVSS Score: 4.0 CVSS Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P
Querverweis:	Common Vulnerability Exposure (CVE) ID: CVE-2020-8619 https://kb.isc.org/docs/cve-2020-8619 Debian Security Information: DSA-4752 (Google Search) https://www.debian.org/security/2020/dsa-4752 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CNFTTYJ5JJJJ6QG3AHXJGDIIEYMDFWFW/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EIOXMJX4N3LBKC65OXNBE52W4GAS7QEX/ SuSE Security Announcement: openSUSE-SU-2020:1699 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html SuSE Security Announcement: openSUSE-SU-2020:1701 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html https://usn.ubuntu.com/4399-1/
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