CVE-2024-1975 SIG(0) can be used to exhaust CPU resources
Attackers can exhaust CPU resources on BIND servers or resolvers by sending SIG(0) signed requests if specific DNSSEC KEY records are present.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-1975?
CVE-2024-1975 is a high-severity denial of service vulnerability in ISC BIND 9, published on 23 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
If a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache, a client can exhaust resolver CPU resources by sending a stream of SIG(0) signed requests. This issue affects BIND 9 versions 9.0.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.49-S1, and 9.18.11-S1 through 9.18.27-S1.
Weakness: CWE-770
Which versions are affected by CVE-2024-1975?
How do I fix CVE-2024-1975?
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-2024-1975 being exploited?
There is no known exploitation of CVE-2024-1975 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2024-1975, AZL-46969, AZL-47000, AZL-47039, BELL-CVE-2024-1975, CLSA-2024-1724704960 and 9 more.