full-disclosure - [PLSA 2008-35] Ruby: Denial of Service

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Date: Mon, 01 Sep 2008 04:22:30 +0300
From: Pınar Yanardağ <pinar@...dus.org.tr>
To: pardus-security@...dus.org.tr
Cc: full-disclosure@...ts.grok.org.uk
Subject: [PLSA 2008-35] Ruby: Denial of Service

------------------------------------------------------------------------
Pardus Linux Security Advisory 2008-35            security@...dus.org.tr
------------------------------------------------------------------------
       Date: 2008-09-01
   Severity: 3
       Type: Remote
------------------------------------------------------------------------

Summary
=======

A vulnerability has been reported in Ruby, which can  be  exploited  by
malicious people to cause a DoS (Denial of Service).

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

The vulnerability is caused due to an error in the REXML  library  when
processing recursively nested XML entities. This can  be  exploited  to
cause a DoS via a specially crafted XML document.

Note: This vulnerability found by Luka Treiber and Mitja Kolsek of ACROS
Security.

Affected packages:

   Pardus 2008:
     ruby, all before 1.8.7_p72-17-5
     ruby-mode, all before 1.8.7_p72-17-5

   Pardus 2007:
     ruby, all before 1.8.7_p72-17-14
     ruby-mode, all before 1.8.7_p72-17-5

Resolution
==========

There are update(s) for ruby, ruby-mode. You can update them via Package
Manager or with a single command from console:

   Pardus 2008:
     pisi up ruby ruby-mode

   Pardus 2007:
     pisi up ruby ruby-mode

References
==========

   * http://security.pardus.org.tr/en/2008-35
   * http://bugs.pardus.org.tr/show_bug.cgi?id=8044
   * http://www.ruby-lang.org/en/news/2008/08/23/dos-vulnerability-in-rexml/
   * http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-3790
   * http://secunia.com/advisories/31602

------------------------------------------------------------------------

-- 
Pınar Yanardağ
Pardus Security Team
http://security.pardus.org.tr

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