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.
Published 2020-01-06 18:15:23
Updated 2021-07-21 11:39:24
Source MITRE
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2019-18792

1.05%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 84 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-18792

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.4
MEDIUM AV:N/AC:L/Au:N/C:N/I:P/A:P
10.0
4.9
NIST
9.1
CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
3.9
5.2
NIST

CWE ids for CVE-2019-18792

  • 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.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-18792

Products affected by CVE-2019-18792

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