medium
6.5
CWE
617
Advisory Published
Updated

CVE-2020-8622: A truncated TSIG response can lead to an assertion failure

First published: Fri Aug 21 2020(Updated: )

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.

Credit: security-officer@isc.org

Affected SoftwareAffected VersionHow to fix
IBM Cloud Pak for Security (CP4S)<=1.7.2.0
IBM Cloud Pak for Security (CP4S)<=1.7.1.0
IBM Cloud Pak for Security (CP4S)<=1.7.0.0
debian/bind9
1:9.16.50-1~deb11u2
1:9.16.50-1~deb11u3
1:9.18.28-1~deb12u2
1:9.18.33-1~deb12u2
1:9.20.4-4
1:9.20.5-1
BIND 9>=9.0.0<=9.11.21
BIND 9>=9.12.0<=9.16.5
BIND 9>=9.17.0<=9.17.3
BIND 9=9.9.3-s1
BIND 9=9.11.21-s1
Fedora=31
Fedora=32
Debian=9.0
Debian=10.0
Ubuntu=12.04
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=18.04
Ubuntu=20.04
NetApp SteelStore
openSUSE=15.1
openSUSE=15.2
Synology DNS Server<2.2.2-5028
Oracle Communications Diameter Signaling Router>=8.0.0<=8.5.0

Remedy

https://www.oracle.com/security-alerts/cpuoct2021.html

Remedy

Upgrade to the patched release most closely related to your current version of BIND: BIND 9.11.22 BIND 9.16.6 BIND 9.17.4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. BIND 9.11.22-S1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2020-8622?

    The severity of CVE-2020-8622 is medium.

  • How does CVE-2020-8622 affect ISC BIND?

    CVE-2020-8622 affects ISC BIND versions 9.0.0 to 9.11.21, 9.12.0 to 9.16.5, and 9.17.0 to 9.17.3.

  • How can an attacker exploit CVE-2020-8622?

    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 a denial of service.

  • Which software versions are affected by CVE-2020-8622?

    ISC BIND versions 9.0.0 to 9.11.21, 9.12.0 to 9.16.5, and 9.17.0 to 9.17.3 are affected by CVE-2020-8622.

  • Where can I find more information about CVE-2020-8622?

    You can find more information about CVE-2020-8622 in the references provided: [link1](http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html), [link2](http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html), [link3](https://kb.isc.org/docs/cve-2020-8622).

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