CVE-2020-8619 A buffer boundary check assertion in rdataset.c can fail incorrectly during zone transfer
An attacker with high privileges can cause a denial of service in ISC BIND9 by introducing specific zone records that trigger an assertion failure.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-8619?
CVE-2020-8619 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 17 Jun 2020. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
In ISC BIND9 versions BIND 9.11.14 -> 9.11.19, BIND 9.14.9 -> 9.14.12, BIND 9.16.0 -> 9.16.3, BIND Supported Preview Edition 9.11.14-S1 -> 9.11.19-S1: Unless a nameserver is providing authoritative service for one or more zones and at least one zone contains an empty non-terminal entry containing an asterisk ("*") character, this defect cannot be encountered. A would-be attacker who is allowed to change zone content could theoretically introduce such a record in order to exploit this condition to cause denial of service, though we consider the use of this vector unlikely because any such attack would require a significant privilege level and be easily traceable.
Weakness: CWE-404
Which versions are affected by CVE-2020-8619?
It affects 6 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Isc Bind, Netapp Steelstore Cloud Integrated Storage, Opensuse Leap.
How do I fix CVE-2020-8619?
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-2020-8619 being exploited?
There is no known exploitation of CVE-2020-8619 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as ALPINE-CVE-2020-8619, DEBIAN-CVE-2020-8619, GHSA-fw3j-5rrr-7j3r, UBUNTU-CVE-2020-8619.