CVE-2020-12667
CVSS V2 Medium 5
CVSS V3 High 7.5
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.
Overview
- CVE ID
- CVE-2020-12667
- Assigner
- cve@mitre.org
- Vulnerability Status
- Modified
- Published Version
- 2020-05-19T13:15:11
- Last Modified Date
- 2020-05-28T07:15:10
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:nic:knot_resolver:*:*:*:*:*:*:*:* | 1 | OR | 5.1.1 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:N/C:N/I:N/A:P
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- NONE
- Integrity Impact
- NONE
- Availability Impact
- PARTIAL
- Base Score
- 5
- Severity
- MEDIUM
- Exploitability Score
- 10
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- HIGH
- Base Score
- 7.5
- Base Severity
- HIGH
- Exploitability Score
- 3.9
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| 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/ |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-12667 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12667 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 17:30:21 | Added to TrackCVE | |||
| 2022-12-04 16:40:31 | 2020-05-19T13:15Z | 2020-05-19T13:15:11 | CVE Published Date | updated |
| 2022-12-04 16:40:31 | 2020-05-28T07:15:10 | CVE Modified Date | updated | |
| 2022-12-04 16:40:31 | Modified | Vulnerability Status | updated |