Vulnerability CVE-2021-45098: Information
Description
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.
Severity: HIGH (7.5) Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Fixed packages
Package name | Branch | Fixed in version | Version from repository | Errata ID | Task # | State |
|---|---|---|---|---|---|---|
| suricata | sisyphus | 6.0.4-alt1 | 6.0.19-alt1 | ALT-PU-2022-1180-1 | 294444 | Fixed |
| suricata | c10f1 | 6.0.10-alt1 | 6.0.10-alt1 | ALT-PU-2024-3982-2 | 342715 | Fixed |
| suricata | c9f2 | 6.0.10-alt0.c9f2.1 | 6.0.19-alt0.c9f2.1 | ALT-PU-2024-8133-3 | 348670 | Fixed |
| suricata | p11 | 6.0.4-alt1 | 6.0.10-alt1 | ALT-PU-2022-1180-1 | 294444 | Fixed |
References to Advisories, Solutions, and Tools
Hyperlink | Resource |
|---|---|
| https://github.com/OISF/suricata/releases |
|
| https://redmine.openinfosecfoundation.org/issues/4710 |
|
| https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942 |
|
| https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df |
|