CVE-2020-12667 Denial of service in n/a
Attackers can cause traffic amplification and denial of service in Knot Resolver by sending crafted DNS answers with random subdomains.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-12667?
CVE-2020-12667 is a high-severity denial of service vulnerability in n/a, published on 19 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2020-12667?
It affects 1 product.
Products include Nic Knot Resolver.
How do I fix CVE-2020-12667?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-12667 being exploited?
There is no known exploitation of CVE-2020-12667 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2020-12667, GHSA-2gpj-6wgq-8636, UBUNTU-CVE-2020-12667.