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

  HttpObjectDecoder.java 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

  HttpObjectDecoder.java 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: https://wiki.debian.org/LTS