Ruby: CGI::Session creates files insecurely
GLSA 200409-08
Published: 2004-09-03 20:45:37
Updated: 2004-09-03 20:45:37

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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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