CVE-2023-4408 Parsing large DNS messages may cause excessive CPU load
Attackers can cause excessive CPU load and denial of service on BIND DNS servers by sending crafted DNS messages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-4408?
CVE-2023-4408 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 13 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The DNS message parsing code in `named` includes a section whose computational complexity is overly high. It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive CPU load on the affected `named` instance by exploiting this flaw. This issue affects both authoritative servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.
Weakness: CWE-407
Which versions are affected by CVE-2023-4408?
It affects 3 products.
Products include Fedoraproject Fedora, Isc Bind, Netapp Ontap.
How do I fix CVE-2023-4408?
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-2023-4408 being exploited?
There is no known exploitation of CVE-2023-4408 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as ALPINE-CVE-2023-4408, AZL-34353, AZL-34560, BELL-CVE-2023-4408, CLSA-2024-1717086870, CLSA-2024-1717087024 and 10 more.