DNS Traffic Amplification Vulnerability in Knot Resolver by CZ.NIC
CVE-2020-12667

7.5HIGH

Key Information:

Vendor

Nic

Status
Knot Resolver
Vendor
CVE Published:
19 May 2020

What is CVE-2020-12667?

Knot Resolver prior to version 5.1.1 is susceptible to an NXNSAttack, allowing attackers to exploit crafted DNS responses from malicious servers. This vulnerability enables traffic amplification through random subdomains embedded in NS records, potentially leading to service disruption by overwhelming target systems with excessive traffic. Users of affected versions are strongly recommended to update to mitigate this serious risk.

References

https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-reso...
https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1...
http://www.openwall.com/lists/oss-security/2020/05/19/2
mailing-list

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.