CVE Vulnerability

CVE-2020-12667

Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

Scope

7.5 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/ Technical Description Vendor Advisory
https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html Release Notes Vendor Advisory
http://www.openwall.com/lists/oss-security/2020/05/19/2 Mailing List Third Party Advisory
http://cyber-security-group.cs.tau.ac.il/# Technical Description Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/
Configurations

Configuration 1

cpe:2.3:a:nic:knot_resolver:*:*:*:*:*:*:*:*
Information

Published : 2020-05-19 01:15

Updated : 2020-05-28 07:15

NVD link : CVE-2020-12667

Mitre link : CVE-2020-12667

Products Affected
No products.
CWE
CWE-400