#VU15746 Segmentation fault in Suricata - CVE-2018-18956

Vulnerability identifier: #VU15746

Vulnerability risk: High

CVSSv4.0: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2018-18956

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 attacker to cause DoS condition on the target system.

The weakness exists due to segmentation fault in the ProcessMimeEntity function in util-decode-mime.c when handling malicious input. A remote attacker can supply specially crafted input to the SMTP parser, trigger segfault and cause daemon crash.

Note: according to MITRE statement, the vulnerability has been exploited in the wild in November 2018.

Mitigation
Update to version 4.1.

Vulnerable software versions

Suricata: 4.0.0 - 4.0.5

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External links
https://suricata-ids.org/2018/11/06/suricata-4-1-released/
https://github.com/OISF/suricata/commit/36e84b929cb37bd03943ed14749a4fef3ff1f61d

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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?

Yes. This vulnerability is being exploited in the wild.