CVE-2021-45098

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se ha detectado un problema en Suricata versiones anteriores a 6.0.4. Es posible omitir/evadir cualquier firma basada en HTTP al falsificar un paquete RST TCP con opciones TCP aleatorias del md5header desde el lado del cliente. Después del handshake de tres vías, es posible inyectar un RST ACK con una opción TCP md5header aleatoria. Entonces, el cliente puede enviar una petición HTTP GET con una URL prohibida. El servidor ignorará el RST ACK y enviará el paquete HTTP de respuesta para la petición del cliente. Estos paquetes no desencadenarán una acción de rechazo de Suricata

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-12-16 CVE Reserved
2021-12-16 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2024-08-31 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CAPEC

References (4)

URL	Tag	Source
https://github.com/OISF/suricata/releases	Release Notes

URL	Date	SRC
https://redmine.openinfosecfoundation.org/issues/4710	2024-08-04

URL	Date	SRC
https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df	2022-01-04

URL	Date	SRC
https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942	2022-01-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Oisf Search vendor "Oisf"		Suricata Search vendor "Oisf" for product "Suricata"				< 6.0.4 Search vendor "Oisf" for product "Suricata" and version " < 6.0.4"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0"		-		Affected