CVE Vulnerability

CVE-2021-45098

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.

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

7.5 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/OISF/suricata/releases Release Notes Third Party Advisory
https://redmine.openinfosecfoundation.org/issues/4710 Exploit Issue Tracking
https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942 Release Notes Vendor Advisory
https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df Patch Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Information

Published : 2021-12-16 05:15

Updated : 2022-01-04 04:48

NVD link : CVE-2021-45098

Mitre link : CVE-2021-45098

Products Affected
No products.
CWE
NVD-CWE-noinfo