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high7.5Public exploit code

CVE-2020-8617

Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesse…

Public exploit code

Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.

Impact

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

VendorProductAffected versions
IscBind
from 9.0.0 through 9.11.18
from 9.12.0 through 9.12.4
from 9.13.0 through 9.13.7
from 9.14.0 through 9.14.11
from 9.15.0 through 9.15.6
from 9.16.0 through 9.16.2
DebianDebian Linux
Versions 8.0, 9.0, 10.0
FedoraprojectFedora
Versions 31, 32
OpensuseLeap
Versions 15.1, 15.2
CanonicalUbuntu Linux
Versions 12.04, 14.04, 16.04, 18.04, 19.10, 20.04

Weakness classification

CWE-617

References