Debian Security Advisory

DLA-2364-1 netty -- LTS security update

Date Reported:
04 Sep 2020
Affected Packages:
netty
Vulnerable:
Yes
Security database references:
In the Debian bugtracking system: Bug 950966, Bug 950967.
In Mitre's CVE dictionary: CVE-2019-20444, CVE-2019-20445, CVE-2020-7238, CVE-2020-11612.
More information:

Several vulnerabilities have been discovered in netty, a Java NIO client/server socket framework.

  • CVE-2019-20444

    HttpObjectDecoder.java in Netty before 4.1.44 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 in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.

  • CVE-2020-7238

    Netty 4.1.43.Final allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header. This issue exists because of an incomplete fix for CVE-2019-16869.

  • CVE-2020-11612

    The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.

For Debian 9 stretch, these problems have been fixed in version 1:4.1.7-2+deb9u2.

We recommend that you upgrade your netty packages.

For the detailed security status of netty please refer to its security tracker page at: https://security-tracker.debian.org/tracker/netty

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