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CVE-2019-18792

nvd nist
Published: Jan 6, 2020Modified: Jun 17, 2026

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9.1
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Exploitability: 3.9 / Impact: 5.2
Source: NVD

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.

Affected (3)

Oisf
1 product
Suricata
Debian
1 product
Debian Linux
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Oisf
Suricata
From 4.1.5 to 4.1.6
Suricata
Version 5.0.0
Configuration B
1 vulnerable
Vulnerable SoftwareAffected Versions
Debian Linux
Version 8.0

Related CWEs

CWE-436
Interpretation Conflict
Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.

References (10)

Source: cve@mitre.org
PatchThird Party Advisory
Source: cve@mitre.org
PatchThird Party Advisory
Source: cve@mitre.org
Third Party Advisory
Source: cve@mitre.org
ExploitThird Party Advisory
Source: cve@mitre.org
ExploitThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
ExploitThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
ExploitThird Party Advisory

Timeline

No history available yet.