An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it's possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client's request. These packets will not trigger a Suricata reject action.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-12-16T04:07:57

Updated: 2024-08-04T04:32:13.665Z

Reserved: 2021-12-16T00:00:00

Link: CVE-2021-45098

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2021-12-16T05:15:08.727

Modified: 2022-01-04T16:48:54.087

Link: CVE-2021-45098

cve-icon Redhat

No data.