Date: Fri, 3 Sep 2004 21:16:54 +0200
From: Sune Kloppenborg Jeppesen <jaervosz@gentoo.org>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200409-08 ] Ruby: CGI::Session creates files insecurely
Cc: bugtraq@securityfocus.com, full-disclosure@lists.netsys.com,
security-alerts@linuxsecurity.com
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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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