Bug#1001437: netty: CVE-2021-43797: HTTP fails to validate against control chars in header names which may lead to HTTP request smuggling

[Salvatore Bonaccorso]

Source: netty
Version: 1:4.1.48-4
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for netty.

CVE-2021-43797[0]:
| Netty is an asynchronous event-driven network application framework
| for rapid development of maintainable high performance protocol
| servers & clients. Netty prior to version 4.1.7.1.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 4.1.7.1.Final
| to receive a patch.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-43797
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43797
[1] https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq
[2] https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore