CVE-2019-18792

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.

CVSS Version 3.1
CVSS Version 2.0

nvd
CVE ID: CVE-2019-18792
Base Score: 9.1
Base Severity: CRITICAL
Vector String:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Impact Score: 5.2
Exploitability Score: 3.9

nvd
CVE ID: CVE-2019-18792
Base Score: 6.4
Base Severity: MEDIUM
Vector String:AV:N/AC:L/Au:N/C:N/I:P/A:P

Refrence: NVD

Description​

Description