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Vulnerability Details : 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 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.
Published 2020-05-19 14:15:12
Updated 2022-09-09 17:47:36
Source Internet Systems Consortium (ISC)
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2020-8617

Probability of exploitation activity in the next 30 days: 97.24%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 100 % EPSS Score History EPSS FAQ

Metasploit modules for CVE-2020-8617

  • BIND TSIG Badtime Query Denial of Service
    Disclosure Date : 2020-05-19
    auxiliary/dos/dns/bind_tsig_badtime
    A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c. Authors: - Tobias Klein - Shuto Imai

CVSS scores for CVE-2020-8617

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
4.3
 MEDIUM AV:N/AC:M/Au:N/C:N/I:N/A:P
8.6
2.9
 [email protected]
5.9
 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
2.2
3.6
 [email protected]
7.5
 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
 [email protected]

CWE ids for CVE-2020-8617

  • The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
    Assigned by: [email protected] (Primary)

References for CVE-2020-8617

Products affected by CVE-2020-8617

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