Debian DLA-2110-1 : netty-3.9 security update

medium Nessus Plugin ID 133814
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VPR Score: 6


The remote Debian host is missing a security update.


Several vulnerabilities were discovered in Netty, a Java NIO client/server socket framework :


WebSocket08FrameDecoder allows remote attackers to cause a denial of service (memory consumption) via a TextWebSocketFrame followed by a long stream of ContinuationWebSocketFrames.


The SslHandler allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a crafted SSLv2Hello message.


Netty mishandles whitespace before the colon in HTTP headers (such as a 'Transfer-Encoding : chunked' line), which leads to HTTP request smuggling.

CVE-2019-20444 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an 'invalid fold.'

CVE-2019-20445 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.


Netty allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header.

For Debian 8 'Jessie', these problems have been fixed in version 3.9.0.Final-1+deb8u1.

We recommend that you upgrade your netty-3.9 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Upgrade the affected libnetty-3.9-java package.

See Also

Plugin Details

Severity: Medium

ID: 133814

File Name: debian_DLA-2110.nasl

Version: 1.4

Type: local

Agent: unix

Published: 2/20/2020

Updated: 1/11/2021

Dependencies: ssh_get_info.nasl

Risk Information

Risk Factor: Medium

VPR Score: 6

CVSS v2.0

Base Score: 6.4

Temporal Score: 4.7

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libnetty-3.9-java, cpe:/o:debian:debian_linux:8.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 2/19/2020

Vulnerability Publication Date: 5/6/2014

Reference Information

CVE: CVE-2014-0193, CVE-2014-3488, CVE-2019-16869, CVE-2019-20444, CVE-2019-20445, CVE-2020-7238

BID: 67182, 68999