[ GLSA 200409-08 ] Ruby: CGI::Session creates files insecurely

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200409-08
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Ruby: CGI::Session creates files insecurely
      Date: September 03, 2004
      Bugs: #60525
        ID: 200409-08

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Synopsis
========

When used for CGI scripting, Ruby creates session files in /tmp with
the permissions of the default umask. Depending on that umask, local
users may be able to read sensitive data stored in session files.

Background
==========

Ruby is an Object Oriented, interpreted scripting language used for
many system scripting tasks. It can also be used for CGI web
applications.

Affected packages
=================

    -------------------------------------------------------------------
     Package        /   Vulnerable   /                      Unaffected
    -------------------------------------------------------------------
  1  dev-lang/ruby     < 1.8.2_pre2                      *>= 1.6.8-r11
                                                          *>= 1.8.0-r7
                                                         >= 1.8.2_pre2

Description
===========

The CGI::Session::FileStore implementation (and presumably
CGI::Session::PStore), which allow data associated with a particular
Session instance to be written to a file, writes to a file in /tmp with
no regard for secure permissions. As a result, the file is left with
whatever the default umask permissions are, which commonly would allow
other local users to read the data from that session file.

Impact
======

Depending on the default umask, any data stored using these methods
could be read by other users on the system.

Workaround
==========

By changing the default umask on the system to not permit read access
to other users (e.g. 0700), one can prevent these files from being
readable by other users.

Resolution
==========

All Ruby users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=dev-lang/ruby-your_version"
    # emerge ">=dev-lang/ruby-your_version"

References
==========

  [ 1 ] CAN-2004-0755
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0755

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200409-08.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security () gentoo org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0
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