Debian Security Advisory

DLA-2110-1 netty-3.9 -- LTS security update

Date Reported:
19 Feb 2020
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 746639, Bug 941266, Bug 950966, Bug 950967.
In Mitre's CVE dictionary: CVE-2014-0193, CVE-2014-3488, CVE-2019-16869, CVE-2019-20444, CVE-2019-20445, CVE-2020-7238.
More information:

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

  • CVE-2014-0193

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

  • CVE-2014-3488

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

  • CVE-2019-16869

    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.

  • CVE-2020-7238

    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.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: