Bug 2035809 (CVE-2021-45098) - CVE-2021-45098 suricata: bypass of payload detection on TCP RST with options of MD5header
Summary: CVE-2021-45098 suricata: bypass of payload detection on TCP RST with options ...
Alias: CVE-2021-45098
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 2035810 2035811
TreeView+ depends on / blocked
Reported: 2021-12-27 18:44 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-12-27 19:47 UTC (History)
4 users (show)

Fixed In Version:
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Last Closed: 2021-12-27 19:47:06 UTC

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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.


Upstream patch:

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.

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