CVE-2019-18625

Description

An issue was discovered in Suricata 5.0.0. It was possible to bypass/evade any tcp based signature by faking a closed TCP session using an evil server. After the TCP SYN packet, it is possible to inject a RST ACK and a FIN ACK packet with a bad TCP Timestamp option. The client will ignore the RST ACK and the FIN ACK packets because of the bad TCP Timestamp option. Both linux and windows client are ignoring the injected packets.

CVSS Version 3.1
CVSS Version 2.0

nvd
CVE ID: CVE-2019-18625
Base Score: 7.5
Base Severity: HIGH
Vector String:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Impact Score: 3.6
Exploitability Score: 3.9

nvd
CVE ID: CVE-2019-18625
Base Score: 5.0
Base Severity: MEDIUM
Vector String:AV:N/AC:L/Au:N/C:N/I:P/A:N

Refrence: NVD

Description​

Description