Zero-day vulnerability in Suricata

Segmentation fault
CVE-2018-18956

According to MITRE statement, the vulnerability has been exploited in the wild in November 2018.

Vulnerability details

Advisory: SB2018110710 - Denial of service in Suricata

Vulnerable component: Suricata

CVE-ID: CVE-2018-18956

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-20 - Improper input validation

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.

External links:

https://suricata-ids.org/2018/11/06/suricata-4-1-released/

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.