Vulnerability CVE-2021-21409
Published: 2021-03-30

Description:
Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty (io.netty:netty-codec-http2) before version 4.1.61.Final there is a vulnerability that enables request smuggling. The content-length header is not correctly validated if the request only uses a single Http2HeaderFrame with the endStream set to to true. This could lead to request smuggling if the request is proxied to a remote peer and translated to HTTP/1.1. This is a followup of GHSA-wm47-8v5p-wjpj/CVE-2021-21295 which did miss to fix this one case. This was fixed as part of 4.1.61.Final.

Type:

CWE-444

 (Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling'))

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Netty -> Netty 
Debian -> Debian linux 

 References:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21295
https://github.com/netty/netty/commit/b0fa4d5aab4215f3c22ce6123dd8dd5f38dc0432
https://github.com/netty/netty/security/advisories/GHSA-f256-j965-7f32
https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj
https://lists.apache.org/thread.html/r2732aa3884cacfecac4c54cfaa77c279ba815cad44b464a567216f83@%3Cissues.zookeeper.apache.org%3E
https://lists.apache.org/thread.html/r70c3a7bfa904f06a1902f4df20ee26e4f09a46b8fd3eb304dc57a2de@%3Cdev.zookeeper.apache.org%3E
https://lists.apache.org/thread.html/ra66e93703e3f4bd31bdfd0b6fb0c32ae96b528259bb1aa2b6d38e401@%3Cissues.zookeeper.apache.org%3E
https://www.debian.org/security/2021/dsa-4885
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