Bug 2035809 (CVE-2021-45098)

Summary:	CVE-2021-45098 suricata: bypass of payload detection on TCP RST with options of MD5header
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	ish, jmlich83, jtfas90, sgrubb
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-12-27 19:47:06 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2035810, 2035811
Bug Blocks:

Description Guilherme de Almeida Suckevicz 2021-12-27 18:44:59 UTC

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.

Reference:
https://redmine.openinfosecfoundation.org/issues/4710

Upstream patch:
https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df

Comment 1 Guilherme de Almeida Suckevicz 2021-12-27 18:45:15 UTC

Created suricata tracking bugs for this issue:

Affects: epel-all [bug 2035811]
Affects: fedora-all [bug 2035810]

Comment 2 Product Security DevOps Team 2021-12-27 19:47:04 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.