CVE-2019-18792 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  9.1 CRITICAL
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H


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Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://github.com/OISF/suricata/commit/1c63d3905852f746ccde7e2585600b2199cefb4b Patch  Third Party Advisory 
https://github.com/OISF/suricata/commit/fa692df37a796c3330c81988d15ef1a219afc006 Patch  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html Third Party Advisory 
https://redmine.openinfosecfoundation.org/issues/3324 Exploit  Third Party Advisory 
https://redmine.openinfosecfoundation.org/issues/3394 Exploit  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-94 Improper Control of Generation of Code ('Code Injection') cwe source acceptance level NIST  

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-18792
NVD Published Date:
01/06/2020
NVD Last Modified:
10/29/2020
Source:
MITRE