Input validation error in Knot Resolver - CVE-2019-10191
Published: November 7, 2019
Vulnerability identifier: #VU22593
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-10191
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to hijack domain on the target system.
The vulnerability exists due to insufficient validation of user-supplied input in DNS resolver. A remote attacker can downgrade DNSSEC-secure domains to DNSSEC-insecure state, opening possibility of domain hijack using attacks against insecure DNS protocol.
Affected software
Knot Resolver
knot-resolver (Alpine package)
knot
knot-resolver (Ubuntu package)
knot-resolver
Fedora
Ubuntu
knot-resolver (Alpine package)
knot
knot-resolver (Ubuntu package)
knot-resolver
Fedora
Ubuntu
How to mitigate CVE-2019-10191
Install updates from vendor's website.
Knot Resolver - update to 4.1.0
knot-resolver (Alpine package) - update to 4.1.0-r0
knot - update to 2.8.2-1.el7
knot-resolver (Ubuntu package) - update to 3.2.1-3ubuntu2.2
knot-resolver - addressed in versions 4.1.0-1.el7, 4.1.0-1.fc29, 4.1.0-1.fc30
knot-resolver (Alpine package) - update to 4.1.0-r0
knot - update to 2.8.2-1.el7
knot-resolver (Ubuntu package) - update to 3.2.1-3ubuntu2.2
knot-resolver - addressed in versions 4.1.0-1.el7, 4.1.0-1.fc29, 4.1.0-1.fc30