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CVE-2019-18792

9.1 · CRITICAL

An issue was discovered in Suricata 5.0.0.

Published Jan 6, 2020CWE-436EPSS 2.52%

Overview

CVE-2019-18792 is a critical-severity vulnerability. It was published on January 6, 2020 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An issue was discovered in Suricata 5.0.0. It is possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet is injected just before the PUSH ACK packet we want to bypass. The PUSH ACK packet (containing the data) will be ignored by Suricata because it overlaps the FIN packet (the sequence and ack number are identical in the two packets). The client will ignore the fake FIN packet because the ACK flag is not set. Both linux and windows clients are ignoring the injected packet.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/OISF/suricata/commit/1c63d3905852f746ccde7e2585600b2199cefb4bGitHubgithub.com/OISF/suricata/commit/fa692df37a796c3330c81988d15ef1a219afc006Reflists.debian.org/debian-lts-announce/2020/01/msg00032.htmlRefredmine.openinfosecfoundation.org/issues/3324Refredmine.openinfosecfoundation.org/issues/3394GitHubgithub.com/OISF/suricata/commit/1c63d3905852f746ccde7e2585600b2199cefb4bGitHubgithub.com/OISF/suricata/commit/fa692df37a796c3330c81988d15ef1a219afc006Reflists.debian.org/debian-lts-announce/2020/01/msg00032.htmlRefredmine.openinfosecfoundation.org/issues/3324Refredmine.openinfosecfoundation.org/issues/3394

How CyberStrike helps

Frequently asked questions

What is CVE-2019-18792?

CVE-2019-18792 is a critical-severity vulnerability. It was published on January 6, 2020 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2019-18792?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-18792?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-18792?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-18792 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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