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.

CVSS v3.0 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3.0 : HIGH

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

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:P/A:N

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://github.com/OISF/suricata/releases	Release Notes Third Party Advisory
https://redmine.openinfosecfoundation.org/issues/4710	Exploit Issue Tracking Patch Vendor Advisory
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

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Configurations

Configuration 1 (hide)

cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	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 : 2021-12-15 21:15

Updated : 2022-01-04 08:48

NVD link : CVE-2021-45098

Mitre link : CVE-2021-45098

JSON object : View

CWE

NVD-CWE-noinfo

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Products Affected

debian

debian_linux

oisf

suricata

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