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

[Theodotos Andreou]

OKI enabled the proposed repo and now I got the updated version:

# aptitude show openssl | grep -i version
Version: 1.0.1-4ubuntu5.10

But running TestSSLServer against my dovecot pop3s (port 995) I still
get that the system is vulnerable to CRIME.

Compression is supposed to be disabled by default and only enabled when
you use the OPENSSL_DEFAULT_ZLIB environment variable right?

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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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