Vulnerability identifier: #VU28123
Vulnerability risk: Medium
CVSSv3.1: 7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-617
Exploitation vector: Network
Exploit availability: Yes
Vulnerable software:
ISC BIND
Server applications /
DNS servers
Vendor: 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.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
ISC BIND: 9.0.0 - 9.17.1
External links
http://kb.isc.org/docs/cve-2020-8617
http://www.openwall.com/lists/oss-security/2020/05/19/4
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.