[ GLSA 200812-17 ] Ruby: Multiple vulnerabilities

[Tobias Heinlein <keytoaster () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200812-17
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Ruby: Multiple vulnerabilities
      Date: December 16, 2008
      Bugs: #225465, #236060
        ID: 200812-17

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Synopsis
========

Multiple vulnerabilities have been discovered in Ruby that allow for
attacks including arbitrary code execution and Denial of Service.

Background
==========

Ruby is an interpreted object-oriented programming language. The
elaborate standard library includes an HTTP server ("WEBRick") and a
class for XML parsing ("REXML").

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

    -------------------------------------------------------------------
     Package        /     Vulnerable     /                  Unaffected
    -------------------------------------------------------------------
  1  dev-lang/ruby      < 1.8.6_p287-r1               >= 1.8.6_p287-r1

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

Multiple vulnerabilities have been discovered in the Ruby interpreter
and its standard libraries. Drew Yao of Apple Product Security
discovered the following flaws:

* Arbitrary code execution or Denial of Service (memory corruption)
  in the rb_str_buf_append() function (CVE-2008-2662).

* Arbitrary code execution or Denial of Service (memory corruption)
  in the rb_ary_stor() function (CVE-2008-2663).

* Memory corruption via alloca in the rb_str_format() function
  (CVE-2008-2664).

* Memory corruption ("REALLOC_N") in the rb_ary_splice() and
  rb_ary_replace() functions (CVE-2008-2725).

* Memory corruption ("beg + rlen") in the rb_ary_splice() and
  rb_ary_replace() functions (CVE-2008-2726).

Furthermore, several other vulnerabilities have been reported:

* Tanaka Akira reported an issue with resolv.rb that enables
  attackers to spoof DNS responses (CVE-2008-1447).

* Akira Tagoh of RedHat discovered a Denial of Service (crash) issue
  in the rb_ary_fill() function in array.c (CVE-2008-2376).

* Several safe level bypass vulnerabilities were discovered and
  reported by Keita Yamaguchi (CVE-2008-3655).

* Christian Neukirchen is credited for discovering a Denial of
  Service (CPU consumption) attack in the WEBRick HTTP server
  (CVE-2008-3656).

* A fault in the dl module allowed the circumvention of taintness
  checks which could possibly lead to insecure code execution was
  reported by "sheepman" (CVE-2008-3657).

* Tanaka Akira again found a DNS spoofing vulnerability caused by the
  resolv.rb implementation using poor randomness (CVE-2008-3905).

* Luka Treiber and Mitja Kolsek (ACROS Security) disclosed a Denial
  of Service (CPU consumption) vulnerability in the REXML module when
  dealing with recursive entity expansion (CVE-2008-3790).

Impact
======

These vulnerabilities allow remote attackers to execute arbitrary code,
spoof DNS responses, bypass Ruby's built-in security and taintness
checks, and cause a Denial of Service via crash or CPU exhaustion.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Ruby users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-lang/ruby-1.8.6_p287-r1"

References
==========

  [ 1 ] CVE-2008-1447
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1447
  [ 2 ] CVE-2008-2376
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2376
  [ 3 ] CVE-2008-2662
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2662
  [ 4 ] CVE-2008-2663
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2663
  [ 5 ] CVE-2008-2664
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2664
  [ 6 ] CVE-2008-2725
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2725
  [ 7 ] CVE-2008-2726
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2726
  [ 8 ] CVE-2008-3655
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3655
  [ 9 ] CVE-2008-3656
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3656
  [ 10 ] CVE-2008-3657
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3657
  [ 11 ] CVE-2008-3790
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3790
  [ 12 ] CVE-2008-3905
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3905

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

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

  http://security.gentoo.org/glsa/glsa-200812-17.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 2008 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

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