CVE-2022-3736 named configured to answer from stale cache may terminate unexpectedly while processing RRSIG queries
Attackers can crash the BIND resolver by sending RRSIG queries when stale cache features are enabled, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-3736?
CVE-2022-3736 is a high-severity denial of service vulnerability in Isc Bind, published on 25 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
BIND 9 resolver can crash when stale cache and stale answers are enabled, option `stale-answer-client-timeout` is set to a positive integer, and the resolver receives an RRSIG query. This issue affects BIND 9 versions 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1.
Weakness: CWE-20
Which versions are affected by CVE-2022-3736?
It affects 1 product.
Products include Isc Bind.
How do I fix CVE-2022-3736?
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-2022-3736 being exploited?
There is no known exploitation of CVE-2022-3736 in the wild and no public exploit code.
Other vulnerabilities in Isc Bind
Sources
Also known as ALPINE-CVE-2022-3736, AZL-13203, DEBIAN-CVE-2022-3736, GHSA-5v6f-5gpq-2628, UBUNTU-CVE-2022-3736.