PT-2019-4362 · Cz.Nic+2 · Knot Resolver+2

Petr Špaček · Published 2019-07-10 · Updated 2024-10-01 · CVE-2019-10191

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions knot resolver versions prior to 4.1.0

Description A vulnerability was discovered in the DNS resolver of knot resolver, which allows remote attackers to downgrade DNSSEC-secure domains to a DNSSEC-insecure state. This opens the possibility of domain hijack using attacks against the insecure DNS protocol. The issue is due to insufficient input validation, enabling a remote attacker to convert a DNSSEC-secure domain to an insecure state.

Recommendations For versions prior to 4.1.0, update to version 4.1.0 or later to resolve the issue. As a temporary workaround, consider restricting access to the DNS resolver to minimize the risk of exploitation.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2020-00083

CVE-2019-10191

DLA-3795-1

USN-7047-1

Affected Products

Linuxmint

Ubuntu

Knot Resolver

References · 33

• https://knot-resolver.cz/2019-07-10-knot-resolver-4.1.0.html · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-10190 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2019-10191 · Security Note
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMSSWBHINIX4WE6UDXWM66L7JYEK6XS6 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-19331 · Security Note
• https://ubuntu.com/security/CVE-2019-10191 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2019-10191 · Vendor Advisory
• https://security-tracker.debian.org/tracker/DLA-3795-1 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-10191 · Security Note
• https://bdu.fstec.ru/vul/2020-00083 · Security Note
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/VZV5YZZ5766UIG2TFLFJL6EESQNAP5X5 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-10191 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZV5YZZ5766UIG2TFLFJL6EESQNAP5X5 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-10191 · Security Note
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/TMSSWBHINIX4WE6UDXWM66L7JYEK6XS6 · Vendor Advisory