CVE-2020-8623 A flaw in native PKCS#11 code can lead to a remotely triggerable assertion failure in pk11.c
An attacker can cause a remote crash in BIND DNS servers by sending crafted queries if native PKCS#11 support is enabled and RSA keys are used.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-8623?
CVE-2020-8623 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 21 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In BIND 9.10.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.10.5-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker that can reach a vulnerable system with a specially crafted query packet can trigger a crash. To be vulnerable, the system must: * be running BIND that was built with "--enable-native-pkcs11" * be signing one or more zones with an RSA key * be able to receive queries from a possible attacker
Weakness: CWE-617
Which versions are affected by CVE-2020-8623?
It affects 7 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Isc Bind, Netapp Steelstore Cloud Integrated Storage, Opensuse Leap and 1 more.
How do I fix CVE-2020-8623?
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-2020-8623 being exploited?
There is no known exploitation of CVE-2020-8623 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as ALPINE-CVE-2020-8623, DEBIAN-CVE-2020-8623, GHSA-3hh5-h95j-2cw7, UBUNTU-CVE-2020-8623.