CVEvulnerability

CVE-2020-8617

5.9 MEDIUM Published 2020-05-19 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2020-05-19
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1 ([email protected])
5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected])
4.3 MEDIUM — AV:N/AC:M/Au:N/C:N/I:N/A:P
Weaknesses
CWE-617

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 configurations

• isc bind (>= 9.0.0 <= 9.11.18) • isc bind (>= 9.12.0 <= 9.12.4) • isc bind (>= 9.13.0 <= 9.13.7) • isc bind (>= 9.14.0 <= 9.14.11) • isc bind (>= 9.15.0 <= 9.15.6) • isc bind (>= 9.16.0 <= 9.16.2) • isc bind (>= 9.17.0 <= 9.17.1) • isc bind 9.12.4 • isc bind 9.9.3 • isc bind 9.10.5 • isc bind 9.10.7 • isc bind 9.11.3 • isc bind 9.11.5 • isc bind 9.11.6 • isc bind 9.11.7 • isc bind 9.11.8 • debian debian linux 8.0 • debian debian linux 9.0 • debian debian linux 10.0 • fedoraproject fedora 31 • fedoraproject fedora 32 • opensuse leap 15.1 • opensuse leap 15.2 • canonical ubuntu linux 12.04 • canonical ubuntu linux 14.04 • canonical ubuntu linux 16.04 • canonical ubuntu linux 18.04 • canonical ubuntu linux 19.10 • canonical ubuntu linux 20.04

Related

Weakness · CWE (1)

  • CWE-617 Reachable Assertion weakness

References