#VU36824 Input validation error in Suricata - CVE-2018-14568

Vulnerability identifier: #VU36824

Vulnerability 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-2018-14568

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Suricata
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Open Information Security Foundation

Description

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

Suricata before 4.0.5 stops TCP stream inspection upon a TCP RST from a server. This allows detection bypass because Windows TCP clients proceed with normal processing of TCP data that arrives shortly after an RST (i.e., they act as if the RST had not yet been received).

Mitigation
Install update from vendor's website.

Vulnerable software versions

Suricata: 4.0.0 - 4.0.4

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External links
https://github.com/kirillwow/ids_bypass
https://github.com/OISF/suricata/pull/3428/commits/843d0b7a10bb45627f94764a6c5d468a24143345
https://redmine.openinfosecfoundation.org/issues/2501
https://suricata-ids.org/2018/07/18/suricata-4-0-5-available/

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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.