[Bug 1187195] Re: OpenSSL site-wide compression disable tracking bug

[Theodotos Andreou]

Guys I have also failed the PCI test on my SSL enabled postfix and
dovecot.

I run TestSSLServer and it says:

CRIME status: vulnerable

I am using Ubuntu 12.04.2 LTS (precise) 64 bit and my openssl version is
1.0.1-4ubuntu5.9.

Is this backported to precise? What is the easiest way to be protected
against it? Does the  OPENSSL_DEFAULT_ZLIB env variable works on my
version?

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https://bugs.launchpad.net/bugs/1187195

Title:
  OpenSSL site-wide compression disable tracking bug

Status in “openssl” package in Ubuntu:
  Fix Released
Status in “openssl” source package in Lucid:
  Fix Committed
Status in “openssl” source package in Precise:
  Fix Committed
Status in “openssl” source package in Quantal:
  Fix Committed
Status in “openssl” source package in Raring:
  Fix Committed
Status in “openssl” source package in Saucy:
  Fix Released

Bug description:
  This bug is a tracking bug for OpenSSL patches that introduce a new
  environment variable OPENSSL_DEFAULT_ZLIB that is necessary for re-
  enabling compression on a per-application basis.

  Many applications, such as Apache Webserver, Qt's wrappers, and
  others, provide controls that can be used to configure if compression
  is required, allowed, or forbidden.

  This bug tracks an update to include a patch from Fedora,
  http://pkgs.fedoraproject.org/cgit/openssl.git/plain/openssl-1.0.1e-
  env-zlib.patch , that will disable OpenSSL's automatic compression for
  all programs that do not have the OPENSSL_DEFAULT_ZLIB environment
  variable defined. (Value does not matter.) This is necessary because
  some programs, e.g. Postfix, do not have controls exposed to disable
  compression.

  I do not know if the compression-related SSL attacks even make sense
  for SMTP, but some PCI-DSS auditors are flagging Postfix
  configurations with this flaw. It is safer to turn off compression
  everywhere it is not necessary.

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