Input validation error in Knot Resolver



| Updated: 2019-11-07
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-10191
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Knot Resolver
Server applications / Other server solutions

Vendor Nic

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU22593

Risk: Medium

CVSSv4.0: 6.6 [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/E:U/U:Green]

CVE-ID: CVE-2019-10191

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Knot Resolver: 1.0 - 4.0.0

CPE2.3 External links

https://www.knot-resolver.cz/2019-07-10-knot-resolver-4.1.0.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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