CVE-2020-12667
Published: 19 May 2020
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.
Priority
Status
Package | Release | Status |
---|---|---|
knot-resolver Launchpad, Ubuntu, Debian |
bionic |
Needed
|
eoan |
Ignored
(end of life)
|
|
focal |
Needed
|
|
groovy |
Not vulnerable
(5.1.1-0.1ubuntu1)
|
|
hirsute |
Not vulnerable
(5.1.1-0.1ubuntu1)
|
|
impish |
Not vulnerable
(5.1.1-0.1ubuntu1)
|
|
jammy |
Not vulnerable
(5.1.1-0.1ubuntu1)
|
|
kinetic |
Not vulnerable
(5.1.1-0.1ubuntu1)
|
|
lunar |
Not vulnerable
(5.1.1-0.1ubuntu1)
|
|
mantic |
Not vulnerable
(5.1.1-0.1ubuntu1)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.1.1)
|
|
xenial |
Needed
|
|
Patches: upstream: https://gitlab.nic.cz/knot/knot-resolver/-/commit/ba7b89db780fe3884b4e90090318e25ee5afb118 upstream: https://gitlab.nic.cz/knot/knot-resolver/-/commit/54f05e4d7b2e47c0bdd30b84272fc503cc65304b |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.5 |
Attack vector | Network |
Attack complexity | Low |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
- https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/
- http://cyber-security-group.cs.tau.ac.il/#
- http://www.openwall.com/lists/oss-security/2020/05/19/2
- https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html
- https://www.cve.org/CVERecord?id=CVE-2020-12667
- NVD
- Launchpad
- Debian