CVE-2020-12667

HIGH
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

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.

References

http://cyber-security-group.cs.tau.ac.il/#

http://www.openwall.com/lists/oss-security/2020/05/19/2

https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/

https://lists.fedoraproject.org/archives/list/[email protected]/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/

https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html

Details

Source: MITRE

Published: 2020-05-19

Updated: 2020-05-28

Type: CWE-400

Risk Information

CVSS v2

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH

Vulnerable Software

Configuration 1

OR

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

Tenable Plugins

View all (2 total)

IDNameProductFamilySeverity
140671Fedora 31 : knot-resolver (2020-52e28feab6)NessusFedora Local Security Checks
high
137120Fedora 32 : knot-resolver (2020-bf68101ad3)NessusFedora Local Security Checks
high