#VU28123 Reachable Assertion in ISC BIND - CVE-2020-8617
Published: May 20, 2020 / Updated: June 3, 2020
Vulnerability identifier: #VU28123
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:A/U:Green
CVE-ID: CVE-2020-8617
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerable software:
ISC BIND
ISC BIND
Software vendor:
ISC
ISC
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion when checking validity of messages containing TSIG resource records within tsig.c. A remote attacker can send a specially crafted message and 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.
Remediation
Install updates from vendor's website.