SB2019071061 - Fedora 29 update for knot-resolver

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Main Vulnerability Database SB2019071061

SB2019071061 - Fedora 29 update for knot-resolver

Published: July 10, 2019 Updated: April 25, 2025

Security Bulletin ID SB2019071061
Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Input validation error (CVE-ID: CVE-2019-10190)

The vulnerability allows a remote non-authenticated attacker to manipulate data.

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.


2) Input validation error (CVE-ID: CVE-2019-10191)

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.


Remediation

Install update from vendor's website.

References