CVE-2023-50868 Denial of service in n/a
Remote attackers can cause denial of service via CPU exhaustion in DNSSEC NSEC3 processing, affecting DNS resolvers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-50868?
CVE-2023-50868 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 14 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.
Weakness: CWE-400
Which versions are affected by CVE-2023-50868?
It affects 8 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Isc Bind, Netapp Active Iq Unified Manager, Netapp Bootstrap Os, Netapp Hci Baseboard Management Controller and 2 more.
How do I fix CVE-2023-50868?
Apply the vendor's patch.
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-2023-50868 being exploited?
There is no known exploitation of CVE-2023-50868 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2023-50868, AZL-34441, AZL-35329, BELL-CVE-2023-50868, CLEANSTART-2026-RU38296, CLSA-2024-1729513208 and 5 more.