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[SECURITY] [DLA 2364-1] netty security update

Debian LTS Advisory DLA-2364-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                  Roberto C. Sánchez
September 04, 2020                            https://wiki.debian.org/LTS

Package        : netty
Version        : 1:4.1.7-2+deb9u2
CVE ID         : CVE-2019-20444 CVE-2019-20445 CVE-2020-7238 CVE-2020-11612
Debian Bug     : 950966 950967

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


    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


    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.


    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


    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

We recommend that you upgrade your netty packages.

For the detailed security status of netty please refer to
its security tracker page at:

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

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