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Gentoo Linux Security Advisory                           GLSA 201001-09
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Ruby: Terminal Control Character Injection
      Date: January 14, 2010
      Bugs: #300468
        ID: 201001-09

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Synopsis
========

An input sanitation flaw in the WEBrick HTTP server included in Ruby
might allow remote attackers to inject arbitrary control characters
into terminal sessions.

Background
==========

Ruby is an interpreted scripting language for quick and easy
object-oriented programming. It comes bundled with a HTTP server
("WEBrick").

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

    -------------------------------------------------------------------
     Package        /   Vulnerable   /                      Unaffected
    -------------------------------------------------------------------
  1  dev-lang/ruby     < 1.8.7_p249                      >= 1.8.7_p249
                                                        *>= 1.8.6_p388

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

Giovanni Pellerano, Alessandro Tanasi and Francesco Ongaro reported
that WEBrick does not filter terminal control characters, for instance
when handling HTTP logs.

Impact
======

A remote attacker could send a specially crafted HTTP request to a
WEBrick server to inject arbitrary terminal control characters,
possibly resulting in the execution of arbitrary commands, data loss,
or other unspecified impact. This could also be used to facilitate
other attacks.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Ruby 1.8.7 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-lang/ruby-1.8.7_p249"

All Ruby 1.8.6 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-lang/ruby-1.8.6_p388"

References
==========

  [ 1 ] CVE-2009-4492
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4492

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

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

  http://security.gentoo.org/glsa/glsa-201001-09.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
https://bugs.gentoo.org.

License
=======

Copyright 2010 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/2.5