CVE-2018-5745 An assertion failure can occur if a trust anchor rolls over to an unsupported key algorithm when using managed-keys
A remote attacker can cause a denial of service in BIND servers using managed-keys by triggering an assertion failure during DNSSEC key rollover with unsupported algorithms.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-5745?
CVE-2018-5745 is a medium-severity denial of service vulnerability in Isc Bind, published on 9 Oct 2019. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
"managed-keys" is a feature which allows a BIND resolver to automatically maintain the keys used by trust anchors which operators configure for use in DNSSEC validation. Due to an error in the managed-keys feature it is possible for a BIND server which uses managed-keys to exit due to an assertion failure if, during key rollover, a trust anchor's keys are replaced with keys which use an unsupported algorithm. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.5-P1, 9.12.0 -> 9.12.3-P1, and versions 9.9.3-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition. Versions 9.13.0 -> 9.13.6 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5745.
Weakness: CWE-327
Which versions are affected by CVE-2018-5745?
It affects 1 product.
Products include Isc Bind.
How do I fix CVE-2018-5745?
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-2018-5745 being exploited?
There is no known exploitation of CVE-2018-5745 in the wild and no public exploit code.
Other vulnerabilities in Isc Bind
Sources
Also known as ALPINE-CVE-2018-5745, DEBIAN-CVE-2018-5745, GHSA-p5r3-98fj-vgcv, UBUNTU-CVE-2018-5745.