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Category:   Application (Generic)  >   Ruby Vendors:   Matsumoto, Yukihiro
(Red Hat Issues Fix) Ruby 64-bit BigDecimal Integer Truncation Flaw Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1025729
SecurityTracker URL:  http://securitytracker.com/id/1025729
CVE Reference:   CVE-2011-0188   (Links to External Site)
Date:  Jun 28 2011
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.9.2
Description:   A vulnerability was reported in Ruby. A remote user can execute arbitrary code on the target system.

A remote user can send specially crafted data to a Ruby script that uses untrusted input to create a BigDecimal object to potentially trigger an integer truncation flaw and execute arbitrary code.

64-bit processes are affected.

Drew Yao of Apple Product Security reported this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-0910.html

Vendor URL:  www.ruby-lang.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Mar 22 2011 Ruby 64-bit BigDecimal Integer Truncation Flaw Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2011:0910-01] Moderate: ruby security update

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

Synopsis:          Moderate: ruby security update
Advisory ID:       RHSA-2011:0910-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0910.html
Issue date:        2011-06-28
CVE Names:         CVE-2011-0188 CVE-2011-1004 CVE-2011-1005 
=====================================================================

1. Summary:

Updated ruby packages that fix three 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 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.

A flaw was found in the way large amounts of memory were allocated on
64-bit systems when using the BigDecimal class. A context-dependent
attacker could use this flaw to cause memory corruption, causing a Ruby
application that uses the BigDecimal class to crash or, possibly, execute
arbitrary code. This issue did not affect 32-bit systems. (CVE-2011-0188)

A race condition flaw was found in the remove system entries method in the
FileUtils module. If a local user ran a Ruby script that uses this method,
a local attacker could use this flaw to delete arbitrary files and
directories accessible to that user via a symbolic link attack.
(CVE-2011-1004)

A flaw was found 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-2011-1005)

Red Hat would like to thank Drew Yao of Apple Product Security for
reporting the CVE-2011-0188 issue.

All Ruby users should 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/kb/docs/DOC-11259

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

678913 - CVE-2011-1004 Ruby: Symlink race condition by removing directory trees in fileutils module
678920 - CVE-2011-1005 Ruby: Untrusted codes able to modify arbitrary strings
682332 - CVE-2011-0188 ruby: memory corruption in BigDecimal on 64bit platforms

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/ruby-1.8.7.299-7.el6_1.1.src.rpm

i386:
ruby-1.8.7.299-7.el6_1.1.i686.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-irb-1.8.7.299-7.el6_1.1.i686.rpm
ruby-libs-1.8.7.299-7.el6_1.1.i686.rpm

x86_64:
ruby-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-irb-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-libs-1.8.7.299-7.el6_1.1.i686.rpm
ruby-libs-1.8.7.299-7.el6_1.1.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-1.8.7.299-7.el6_1.1.src.rpm

i386:
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-devel-1.8.7.299-7.el6_1.1.i686.rpm
ruby-docs-1.8.7.299-7.el6_1.1.i686.rpm
ruby-rdoc-1.8.7.299-7.el6_1.1.i686.rpm
ruby-ri-1.8.7.299-7.el6_1.1.i686.rpm
ruby-static-1.8.7.299-7.el6_1.1.i686.rpm
ruby-tcltk-1.8.7.299-7.el6_1.1.i686.rpm

x86_64:
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-devel-1.8.7.299-7.el6_1.1.i686.rpm
ruby-devel-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-docs-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-rdoc-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-ri-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-static-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-tcltk-1.8.7.299-7.el6_1.1.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-1.8.7.299-7.el6_1.1.src.rpm

x86_64:
ruby-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-devel-1.8.7.299-7.el6_1.1.i686.rpm
ruby-devel-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-docs-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-irb-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-libs-1.8.7.299-7.el6_1.1.i686.rpm
ruby-libs-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-rdoc-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-ri-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-static-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-tcltk-1.8.7.299-7.el6_1.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/ruby-1.8.7.299-7.el6_1.1.src.rpm

i386:
ruby-1.8.7.299-7.el6_1.1.i686.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-irb-1.8.7.299-7.el6_1.1.i686.rpm
ruby-libs-1.8.7.299-7.el6_1.1.i686.rpm

ppc64:
ruby-1.8.7.299-7.el6_1.1.ppc64.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.ppc.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.ppc64.rpm
ruby-irb-1.8.7.299-7.el6_1.1.ppc64.rpm
ruby-libs-1.8.7.299-7.el6_1.1.ppc.rpm
ruby-libs-1.8.7.299-7.el6_1.1.ppc64.rpm

s390x:
ruby-1.8.7.299-7.el6_1.1.s390x.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.s390.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.s390x.rpm
ruby-irb-1.8.7.299-7.el6_1.1.s390x.rpm
ruby-libs-1.8.7.299-7.el6_1.1.s390.rpm
ruby-libs-1.8.7.299-7.el6_1.1.s390x.rpm

x86_64:
ruby-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-irb-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-libs-1.8.7.299-7.el6_1.1.i686.rpm
ruby-libs-1.8.7.299-7.el6_1.1.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-1.8.7.299-7.el6_1.1.src.rpm

i386:
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-devel-1.8.7.299-7.el6_1.1.i686.rpm
ruby-docs-1.8.7.299-7.el6_1.1.i686.rpm
ruby-rdoc-1.8.7.299-7.el6_1.1.i686.rpm
ruby-ri-1.8.7.299-7.el6_1.1.i686.rpm
ruby-static-1.8.7.299-7.el6_1.1.i686.rpm
ruby-tcltk-1.8.7.299-7.el6_1.1.i686.rpm

ppc64:
ruby-debuginfo-1.8.7.299-7.el6_1.1.ppc.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.ppc64.rpm
ruby-devel-1.8.7.299-7.el6_1.1.ppc.rpm
ruby-devel-1.8.7.299-7.el6_1.1.ppc64.rpm
ruby-docs-1.8.7.299-7.el6_1.1.ppc64.rpm
ruby-rdoc-1.8.7.299-7.el6_1.1.ppc64.rpm
ruby-ri-1.8.7.299-7.el6_1.1.ppc64.rpm
ruby-static-1.8.7.299-7.el6_1.1.ppc64.rpm
ruby-tcltk-1.8.7.299-7.el6_1.1.ppc64.rpm

s390x:
ruby-debuginfo-1.8.7.299-7.el6_1.1.s390.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.s390x.rpm
ruby-devel-1.8.7.299-7.el6_1.1.s390.rpm
ruby-devel-1.8.7.299-7.el6_1.1.s390x.rpm
ruby-docs-1.8.7.299-7.el6_1.1.s390x.rpm
ruby-rdoc-1.8.7.299-7.el6_1.1.s390x.rpm
ruby-ri-1.8.7.299-7.el6_1.1.s390x.rpm
ruby-static-1.8.7.299-7.el6_1.1.s390x.rpm
ruby-tcltk-1.8.7.299-7.el6_1.1.s390x.rpm

x86_64:
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-devel-1.8.7.299-7.el6_1.1.i686.rpm
ruby-devel-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-docs-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-rdoc-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-ri-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-static-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-tcltk-1.8.7.299-7.el6_1.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/ruby-1.8.7.299-7.el6_1.1.src.rpm

i386:
ruby-1.8.7.299-7.el6_1.1.i686.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-irb-1.8.7.299-7.el6_1.1.i686.rpm
ruby-libs-1.8.7.299-7.el6_1.1.i686.rpm

x86_64:
ruby-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-irb-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-libs-1.8.7.299-7.el6_1.1.i686.rpm
ruby-libs-1.8.7.299-7.el6_1.1.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-1.8.7.299-7.el6_1.1.src.rpm

i386:
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-devel-1.8.7.299-7.el6_1.1.i686.rpm
ruby-docs-1.8.7.299-7.el6_1.1.i686.rpm
ruby-rdoc-1.8.7.299-7.el6_1.1.i686.rpm
ruby-ri-1.8.7.299-7.el6_1.1.i686.rpm
ruby-static-1.8.7.299-7.el6_1.1.i686.rpm
ruby-tcltk-1.8.7.299-7.el6_1.1.i686.rpm

x86_64:
ruby-debuginfo-1.8.7.299-7.el6_1.1.i686.rpm
ruby-debuginfo-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-devel-1.8.7.299-7.el6_1.1.i686.rpm
ruby-devel-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-docs-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-rdoc-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-ri-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-static-1.8.7.299-7.el6_1.1.x86_64.rpm
ruby-tcltk-1.8.7.299-7.el6_1.1.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-2011-0188.html
https://www.redhat.com/security/data/cve/CVE-2011-1004.html
https://www.redhat.com/security/data/cve/CVE-2011-1005.html
https://access.redhat.com/security/updates/classification/#moderate
http://www.ruby-lang.org/en/news/2011/02/18/fileutils-is-vulnerable-to-symlink-race-attacks/
http://www.ruby-lang.org/en/news/2011/02/18/exception-methods-can-bypass-safe/

8. Contact:

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

Copyright 2011 Red Hat, Inc.
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