CVE Vulnerability

CVE-2019-18792

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.

6.4 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 4.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

9.1 /10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/OISF/suricata/commit/1c63d3905852f746ccde7e2585600b2199cefb4b Patch Third Party Advisory
https://redmine.openinfosecfoundation.org/issues/3324 Exploit Third Party Advisory
https://redmine.openinfosecfoundation.org/issues/3394 Exploit 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
Configurations

Configuration 1

cpe:2.3:a:suricata-ids:suricata:*:*:*:*:*:*:*:*
cpe:2.3:a:suricata-ids:suricata:5.0.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
Information

Published : 2020-01-06 06:15

Updated : 2021-07-21 11:39

NVD link : CVE-2019-18792

Mitre link : CVE-2019-18792

Products Affected

Suricata

Suricata-ids

CWE
CWE-436