CVE-2019-10190 Security feature bypass in knot-resolver

What is CVE-2019-10190?

CVE-2019-10190 is a medium-severity vulnerability in Fedoraproject Fedora, published on 16 Jul 2019. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was discovered in DNS resolver component of knot resolver through version 3.2.0 before 4.1.0 which allows remote attackers to bypass DNSSEC validation for non-existence answer. NXDOMAIN answer would get passed through to the client even if its DNSSEC validation failed, instead of sending a SERVFAIL packet. Caching is not affected by this particular bug but see CVE-2019-10191.

Weakness: CWE-20

Which versions are affected by CVE-2019-10190?

It affects 2 products.

Products include Fedoraproject Fedora, Nic Knot Resolver.

How do I fix CVE-2019-10190?

Upgrade to a fixed version.

Is CVE-2019-10190 being exploited?

There is no known exploitation of CVE-2019-10190 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-10190, GHSA-5pqr-9wpj-5m82, UBUNTU-CVE-2019-10190.