Security restrictions bypass in Knot Resolver

1) Security restrictions bypass

EUVDB-ID: #VU14571

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-10920

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The vulnerability exists due to an error in DNS resolver component when processing malicious input. A remote attacker can supply specially crafted data, bypass security restrictions and poison cache.

Mitigation

Update to version 2.4.1.

Vulnerable software versions

Knot Resolver: 1.0 - 2.4

External links

http://www.knot-resolver.cz/2018-08-02-knot-resolver-2.4.1.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.