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CVE-2020-8617

7.5 · HIGH

Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the…

Published May 19, 2020CWE-617EPSS 93.42%

Overview

CVE-2020-8617 is a high-severity vulnerability. It was published on May 19, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlReflists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlRefpacketstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.htmlRefwww.openwall.com/lists/oss-security/2020/05/19/4Refkb.isc.org/docs/cve-2020-8617Reflists.debian.org/debian-lts-announce/2020/05/msg00031.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/Refsecurity.netapp.com/advisory/ntap-20200522-0002/Refusn.ubuntu.com/4365-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-8617?

CVE-2020-8617 is a high-severity vulnerability. It was published on May 19, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2020-8617?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-8617?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-8617?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-8617 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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