CVE-2019-6476 An error in QNAME minimization code can cause BIND to exit with an assertion failure
A defect in QNAME minimization allows a malicious forwarder to crash the BIND DNS server via assertion failure, requiring specific forwarding configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-6476?
CVE-2019-6476 is a medium-severity denial of service vulnerability in Isc Bind, published on 17 Oct 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A defect in code added to support QNAME minimization can cause named to exit with an assertion failure if a forwarder returns a referral rather than resolving the query. This affects BIND versions 9.14.0 up to 9.14.6, and 9.15.0 up to 9.15.4.
Weakness: CWE-617
Which versions are affected by CVE-2019-6476?
It affects 1 product.
Products include Isc Bind.
How do I fix CVE-2019-6476?
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-2019-6476 being exploited?
There is no known exploitation of CVE-2019-6476 in the wild and no public exploit code.
Other vulnerabilities in Isc Bind
Sources
Also known as ALPINE-CVE-2019-6476, GHSA-7rr8-wvj2-chhv.