CVE-2020-10995 Denial of service in n/a
Attackers can exploit DNS protocol flaws to amplify traffic, degrading performance for recursive and authoritative name servers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-10995?
CVE-2020-10995 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 19 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PowerDNS Recursor from 4.1.0 up to and including 4.3.0 does not sufficiently defend against amplification attacks. An issue in the DNS protocol has been found that allow malicious parties to use recursive DNS services to attack third party authoritative name servers. The attack uses a crafted reply by an authoritative name server to amplify the resulting traffic between the recursive and other authoritative name servers. Both types of service can suffer degraded performance as an effect. This is triggered by random subdomains in the NSDNAME in NS records. PowerDNS Recursor 4.1.16, 4.2.2 and 4.3.1 contain a mitigation to limit the impact of this DNS protocol issue.
Weakness: CWE-400
Which versions are affected by CVE-2020-10995?
It affects 5 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Opensuse Backports Sle, Opensuse Leap, Powerdns Recursor.
How do I fix CVE-2020-10995?
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-2020-10995 being exploited?
There is no known exploitation of CVE-2020-10995 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2020-10995, GHSA-g5gv-j2x8-cxr2, UBUNTU-CVE-2020-10995.