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[email protected]NVD:CVE-2019-18792

HistoryJan 06, 2020 - 6:15 p.m.

CVE-2019-18792

2020-01-0618:15:23

CWE-436

[email protected]

web.nvd.nist.gov

CVSS2

6.4

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:P/A:P

CVSS3

9.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

AI Score

9.1

Confidence

High

EPSS

0.01

Percentile

84.1%

JSON

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.

Affected configurations

Nvd

Node

suricata-idssuricataRange4.1.5–4.1.6

suricata-idssuricataMatch5.0.0

Node

debiandebian_linuxMatch8.0

VendorProductVersionCPE
suricata-idssuricata*cpe:2.3:a:suricata-ids:suricata:*:*:*:*:*:*:*:*
suricata-idssuricata5.0.0cpe:2.3:a:suricata-ids:suricata:5.0.0:*:*:*:*:*:*:*
debiandebian_linux8.0cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
suricata-ids	suricata	*	cpe:2.3:a:suricata-ids:suricata::::::::
suricata-ids	suricata	5.0.0	cpe:2.3:a:suricata-ids:suricata:5.0.0:::::::*
debian	debian_linux	8.0	cpe:2.3:o:debian:debian_linux:8.0:::::::*