CVE-2020-8619

A buffer boundary check assertion in rdataset.c can fail incorrectly during zone transfer

Description

In ISC BIND9 versions BIND 9.11.14 -> 9.11.19, BIND 9.14.9 -> 9.14.12, BIND 9.16.0 -> 9.16.3, BIND Supported Preview Edition 9.11.14-S1 -> 9.11.19-S1: 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.

Remediation

Solution:

  • Upgrade to the patched release most closely related to your current version of BIND: BIND 9.11.20 BIND 9.16.4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. BIND 9.11.20-S1

Workaround:

  • None

Category

4.9
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 4.98% Top 15%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory ubuntu.com Vendor Advisory debian.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory isc.org
Affected: ISC BIND9
Published at:
Updated at:

References

Link Tags
https://kb.isc.org/docs/cve-2020-8619 vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CNFTTYJ5JJJJ6QG3AHXJGDIIEYMDFWFW/ vendor advisory
https://security.netapp.com/advisory/ntap-20200625-0003/ third party advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EIOXMJX4N3LBKC65OXNBE52W4GAS7QEX/ vendor advisory
https://usn.ubuntu.com/4399-1/ third party advisory vendor advisory
https://www.debian.org/security/2020/dsa-4752 third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html vendor advisory mailing list third party advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html vendor advisory mailing list third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-8619?
CVE-2020-8619 has been scored as a medium severity vulnerability.
How to fix CVE-2020-8619?
To fix CVE-2020-8619: Upgrade to the patched release most closely related to your current version of BIND: BIND 9.11.20 BIND 9.16.4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. BIND 9.11.20-S1
Is CVE-2020-8619 being actively exploited in the wild?
It is possible that CVE-2020-8619 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~5% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-8619?
CVE-2020-8619 affects ISC BIND9.
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