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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2020-01-06T17:52:54

Updated: 2024-08-05T02:02:39.647Z

Reserved: 2019-11-06T00:00:00

Link: CVE-2019-18792

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2020-01-06T18:15:23.183

Modified: 2021-07-21T11:39:23.747

Link: CVE-2019-18792

cve-icon Redhat

No data.