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CVE
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CVE-2020-8617Date: (C)2020-05-20   (M)2024-01-26


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 5.9CVSS Score : 4.3
Exploit Score: 2.2Exploit Score: 8.6
Impact Score: 3.6Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: HIGHAccess Complexity: MEDIUM
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: NONE
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: NONEAvailability: PARTIAL
Integrity: NONE 
Availability: HIGH 
  
Reference:
DSA-4689
FEDORA-2020-2d89cbcfd9
FEDORA-2020-f9dcd4e9d5
USN-4365-1
USN-4365-2
https://lists.debian.org/debian-lts-announce/2020/05/msg00031.html
http://www.openwall.com/lists/oss-security/2020/05/19/4
http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.html
https://kb.isc.org/docs/cve-2020-8617
https://security.netapp.com/advisory/ntap-20200522-0002/
openSUSE-SU-2020:1699
openSUSE-SU-2020:1701

CPE    6
cpe:/o:debian:debian_linux:9.0
cpe:/a:isc:bind
cpe:/o:debian:debian_linux:8.0
cpe:/o:canonical:ubuntu_linux:18.04::~~lts~~~
...
CWE    1
CWE-617
OVAL    26
oval:org.secpod.oval:def:64144
oval:org.secpod.oval:def:66553
oval:org.secpod.oval:def:64116
oval:org.secpod.oval:def:89002989
...

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