Rapid7 Vulnerability & Exploit Database

Red Hat JBossEAP: HTTP Request/Response Smuggling (CVE-2021-43797)

Free InsightVM Trial No Credit Card Necessary
2024 Attack Intel Report Latest research by Rapid7 Labs
Back to Search

Red Hat JBossEAP: HTTP Request/Response Smuggling (CVE-2021-43797)

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
12/09/2021
Created
09/20/2024
Added
09/19/2024
Modified
09/20/2024

Description

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to "sanitize" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore, and therefore does not do the validation itself. Users should upgrade to version 4.1.71.Final.. A flaw was found in Netty, specifically in the netty-codec-http package. This flaw allows unauthorized control characters at the beginning and end of a request, does not follow the specification, and can cause HTTP request smuggling.

Solution(s)

  • red-hat-jboss-eap-upgrade-latest

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;