CVE-2020-8617

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.

How to fix CVE-2020-8617

To remediate CVE-2020-8617, upgrade the affected package to a fixed version below.

• —upgrade to 9.14.12-r0 or later
• —upgrade to 1:9.16.3-1 or later

Is CVE-2020-8617 being exploited?

Likely — EPSS is 92.6%, placing CVE-2020-8617 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.

Affected packages (2)

• from 0, < 9.14.12-r0
• from 0, < 1:9.16.3-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2020-8617
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2020-8617