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Red Hat Security Advisory 2013-0612-01

Red Hat Security Advisory 2013-0612-01
Posted Mar 8, 2013
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2013-0612-01 - Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to do system management tasks. It was discovered that Ruby's REXML library did not properly restrict XML entity expansion. An attacker could use this flaw to cause a denial of service by tricking a Ruby application using REXML to read text nodes from specially-crafted XML content, which will result in REXML consuming large amounts of system memory. It was found that the RHSA-2011:0910 update did not correctly fix the CVE-2011-1005 issue, a flaw in the method for translating an exception message into a string in the Exception class. A remote attacker could use this flaw to bypass safe level 4 restrictions, allowing untrusted code to modify arbitrary, trusted strings, which safe level 4 restrictions would otherwise prevent.

tags | advisory, remote, denial of service, arbitrary, ruby
systems | linux, redhat
advisories | CVE-2012-4481, CVE-2013-1821
SHA-256 | 32e3a547a3c0a24367f1996785cb9cda8c3f06349a10fc8e3db711bfb8a5421d
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Red Hat Security Advisory 2013-0612-01

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: ruby security update
Advisory ID:       RHSA-2013:0612-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0612.html
Issue date:        2013-03-07
CVE Names:         CVE-2012-4481 CVE-2013-1821 
=====================================================================

1. Summary:

Updated ruby packages that fix two security issues are now available for
Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

Ruby is an extensible, interpreted, object-oriented, scripting language. It
has features to process text files and to do system management tasks.

It was discovered that Ruby's REXML library did not properly restrict XML
entity expansion. An attacker could use this flaw to cause a denial of
service by tricking a Ruby application using REXML to read text nodes from
specially-crafted XML content, which will result in REXML consuming large
amounts of system memory. (CVE-2013-1821)

It was found that the RHSA-2011:0910 update did not correctly fix the
CVE-2011-1005 issue, a flaw in the method for translating an exception
message into a string in the Exception class. A remote attacker could use
this flaw to bypass safe level 4 restrictions, allowing untrusted (tainted)
code to modify arbitrary, trusted (untainted) strings, which safe level 4
restrictions would otherwise prevent. (CVE-2012-4481)

The CVE-2012-4481 issue was discovered by Vit Ondruch of Red Hat.

All users of Ruby are advised to upgrade to these updated packages, which
contain backported patches to resolve these issues.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

863484 - CVE-2012-4481 ruby: Incomplete fix for CVE-2011-1005 for NameError#to_s method when used on objects
914716 - CVE-2013-1821 ruby: entity expansion DoS vulnerability in REXML

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/ruby-1.8.7.352-10.el6_4.src.rpm

i386:
ruby-1.8.7.352-10.el6_4.i686.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.i686.rpm
ruby-devel-1.8.7.352-10.el6_4.i686.rpm
ruby-irb-1.8.7.352-10.el6_4.i686.rpm
ruby-libs-1.8.7.352-10.el6_4.i686.rpm
ruby-rdoc-1.8.7.352-10.el6_4.i686.rpm

x86_64:
ruby-1.8.7.352-10.el6_4.x86_64.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.i686.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.x86_64.rpm
ruby-devel-1.8.7.352-10.el6_4.i686.rpm
ruby-devel-1.8.7.352-10.el6_4.x86_64.rpm
ruby-irb-1.8.7.352-10.el6_4.x86_64.rpm
ruby-libs-1.8.7.352-10.el6_4.i686.rpm
ruby-libs-1.8.7.352-10.el6_4.x86_64.rpm
ruby-rdoc-1.8.7.352-10.el6_4.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/ruby-1.8.7.352-10.el6_4.src.rpm

i386:
ruby-debuginfo-1.8.7.352-10.el6_4.i686.rpm
ruby-docs-1.8.7.352-10.el6_4.i686.rpm
ruby-ri-1.8.7.352-10.el6_4.i686.rpm
ruby-static-1.8.7.352-10.el6_4.i686.rpm
ruby-tcltk-1.8.7.352-10.el6_4.i686.rpm

x86_64:
ruby-debuginfo-1.8.7.352-10.el6_4.x86_64.rpm
ruby-docs-1.8.7.352-10.el6_4.x86_64.rpm
ruby-ri-1.8.7.352-10.el6_4.x86_64.rpm
ruby-static-1.8.7.352-10.el6_4.x86_64.rpm
ruby-tcltk-1.8.7.352-10.el6_4.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/ruby-1.8.7.352-10.el6_4.src.rpm

x86_64:
ruby-1.8.7.352-10.el6_4.x86_64.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.i686.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.x86_64.rpm
ruby-devel-1.8.7.352-10.el6_4.i686.rpm
ruby-devel-1.8.7.352-10.el6_4.x86_64.rpm
ruby-irb-1.8.7.352-10.el6_4.x86_64.rpm
ruby-libs-1.8.7.352-10.el6_4.i686.rpm
ruby-libs-1.8.7.352-10.el6_4.x86_64.rpm
ruby-rdoc-1.8.7.352-10.el6_4.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/ruby-1.8.7.352-10.el6_4.src.rpm

x86_64:
ruby-debuginfo-1.8.7.352-10.el6_4.x86_64.rpm
ruby-docs-1.8.7.352-10.el6_4.x86_64.rpm
ruby-ri-1.8.7.352-10.el6_4.x86_64.rpm
ruby-static-1.8.7.352-10.el6_4.x86_64.rpm
ruby-tcltk-1.8.7.352-10.el6_4.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/ruby-1.8.7.352-10.el6_4.src.rpm

i386:
ruby-1.8.7.352-10.el6_4.i686.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.i686.rpm
ruby-devel-1.8.7.352-10.el6_4.i686.rpm
ruby-irb-1.8.7.352-10.el6_4.i686.rpm
ruby-libs-1.8.7.352-10.el6_4.i686.rpm
ruby-rdoc-1.8.7.352-10.el6_4.i686.rpm

ppc64:
ruby-1.8.7.352-10.el6_4.ppc64.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.ppc.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.ppc64.rpm
ruby-devel-1.8.7.352-10.el6_4.ppc.rpm
ruby-devel-1.8.7.352-10.el6_4.ppc64.rpm
ruby-irb-1.8.7.352-10.el6_4.ppc64.rpm
ruby-libs-1.8.7.352-10.el6_4.ppc.rpm
ruby-libs-1.8.7.352-10.el6_4.ppc64.rpm
ruby-rdoc-1.8.7.352-10.el6_4.ppc64.rpm

s390x:
ruby-1.8.7.352-10.el6_4.s390x.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.s390.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.s390x.rpm
ruby-devel-1.8.7.352-10.el6_4.s390.rpm
ruby-devel-1.8.7.352-10.el6_4.s390x.rpm
ruby-irb-1.8.7.352-10.el6_4.s390x.rpm
ruby-libs-1.8.7.352-10.el6_4.s390.rpm
ruby-libs-1.8.7.352-10.el6_4.s390x.rpm
ruby-rdoc-1.8.7.352-10.el6_4.s390x.rpm

x86_64:
ruby-1.8.7.352-10.el6_4.x86_64.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.i686.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.x86_64.rpm
ruby-devel-1.8.7.352-10.el6_4.i686.rpm
ruby-devel-1.8.7.352-10.el6_4.x86_64.rpm
ruby-irb-1.8.7.352-10.el6_4.x86_64.rpm
ruby-libs-1.8.7.352-10.el6_4.i686.rpm
ruby-libs-1.8.7.352-10.el6_4.x86_64.rpm
ruby-rdoc-1.8.7.352-10.el6_4.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/ruby-1.8.7.352-10.el6_4.src.rpm

i386:
ruby-debuginfo-1.8.7.352-10.el6_4.i686.rpm
ruby-docs-1.8.7.352-10.el6_4.i686.rpm
ruby-ri-1.8.7.352-10.el6_4.i686.rpm
ruby-static-1.8.7.352-10.el6_4.i686.rpm
ruby-tcltk-1.8.7.352-10.el6_4.i686.rpm

ppc64:
ruby-debuginfo-1.8.7.352-10.el6_4.ppc64.rpm
ruby-docs-1.8.7.352-10.el6_4.ppc64.rpm
ruby-ri-1.8.7.352-10.el6_4.ppc64.rpm
ruby-static-1.8.7.352-10.el6_4.ppc64.rpm
ruby-tcltk-1.8.7.352-10.el6_4.ppc64.rpm

s390x:
ruby-debuginfo-1.8.7.352-10.el6_4.s390x.rpm
ruby-docs-1.8.7.352-10.el6_4.s390x.rpm
ruby-ri-1.8.7.352-10.el6_4.s390x.rpm
ruby-static-1.8.7.352-10.el6_4.s390x.rpm
ruby-tcltk-1.8.7.352-10.el6_4.s390x.rpm

x86_64:
ruby-debuginfo-1.8.7.352-10.el6_4.x86_64.rpm
ruby-docs-1.8.7.352-10.el6_4.x86_64.rpm
ruby-ri-1.8.7.352-10.el6_4.x86_64.rpm
ruby-static-1.8.7.352-10.el6_4.x86_64.rpm
ruby-tcltk-1.8.7.352-10.el6_4.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/ruby-1.8.7.352-10.el6_4.src.rpm

i386:
ruby-1.8.7.352-10.el6_4.i686.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.i686.rpm
ruby-devel-1.8.7.352-10.el6_4.i686.rpm
ruby-irb-1.8.7.352-10.el6_4.i686.rpm
ruby-libs-1.8.7.352-10.el6_4.i686.rpm
ruby-rdoc-1.8.7.352-10.el6_4.i686.rpm

x86_64:
ruby-1.8.7.352-10.el6_4.x86_64.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.i686.rpm
ruby-debuginfo-1.8.7.352-10.el6_4.x86_64.rpm
ruby-devel-1.8.7.352-10.el6_4.i686.rpm
ruby-devel-1.8.7.352-10.el6_4.x86_64.rpm
ruby-irb-1.8.7.352-10.el6_4.x86_64.rpm
ruby-libs-1.8.7.352-10.el6_4.i686.rpm
ruby-libs-1.8.7.352-10.el6_4.x86_64.rpm
ruby-rdoc-1.8.7.352-10.el6_4.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/ruby-1.8.7.352-10.el6_4.src.rpm

i386:
ruby-debuginfo-1.8.7.352-10.el6_4.i686.rpm
ruby-docs-1.8.7.352-10.el6_4.i686.rpm
ruby-ri-1.8.7.352-10.el6_4.i686.rpm
ruby-static-1.8.7.352-10.el6_4.i686.rpm
ruby-tcltk-1.8.7.352-10.el6_4.i686.rpm

x86_64:
ruby-debuginfo-1.8.7.352-10.el6_4.x86_64.rpm
ruby-docs-1.8.7.352-10.el6_4.x86_64.rpm
ruby-ri-1.8.7.352-10.el6_4.x86_64.rpm
ruby-static-1.8.7.352-10.el6_4.x86_64.rpm
ruby-tcltk-1.8.7.352-10.el6_4.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2012-4481.html
https://www.redhat.com/security/data/cve/CVE-2013-1821.html
https://access.redhat.com/security/updates/classification/#moderate
https://rhn.redhat.com/errata/RHSA-2011-0910.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2013 Red Hat, Inc.
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