CVE-2020-8622

MEDIUM

BIND 9.0.0-9.11.21, 9.12.0-9.16.5, 9.17.0-9.17.3 - Reachable Assertion via Truncated TSIG Response

Title source: llm
STIX 2.1

Description

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

References (13)

Core 13
Core References
Vendor Advisory x_refsource_confirm
https://kb.isc.org/docs/cve-2020-8622
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/4468-1/
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/4468-2/
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2020/dsa-4752
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/08/msg00053.html
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202008-19
Mailing List, Third Party Advisory vendor-advisory x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
Mailing List, Third Party Advisory vendor-advisory x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuoct2021.html
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20200827-0003/
Third Party Advisory x_refsource_confirm
https://www.synology.com/security/advisory/Synology_SA_20_19

Scores

CVSS v3 6.5
EPSS 0.0263
EPSS Percentile 85.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-617
Status published
Products (17)
canonical/ubuntu_linux 12.04
canonical/ubuntu_linux 14.04
canonical/ubuntu_linux 16.04
canonical/ubuntu_linux 18.04
canonical/ubuntu_linux 20.04
debian/debian_linux 9.0
debian/debian_linux 10.0
fedoraproject/fedora 31
fedoraproject/fedora 32
isc/bind 9.9.3 s1
... and 7 more
Published Aug 21, 2020
Tracked Since Feb 18, 2026