DNS: ISC BIND TSIG Validation Denial of Service

This signature detects attempts to exploit a known vulnerability against BIND TSIG. A successful attack can result in a denial-of-service condition.

Extended 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.

Affected Products

Canonical ubuntu_linux

References

CVE: CVE-2020-8617

Short Name

DNS:QUERY:BIND-TSIG-DOS

Severity

Minor

Recommended

False

Recommended Action

Drop

DNS: ISC BIND TSIG Validation Denial of Service

Extended Description

Affected Products

References

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