Issued:

2012-01-30

Updated:

2012-01-30

RHSA-2012:0070 - Moderate: ruby security update

Synopsis

Moderate: ruby security update

Type/Severity

Security Advisory Moderate

Topic

Updated ruby packages that fix two security issues are now available for Red Hat Enterprise Linux 4 and 5.

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.

Description

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

A denial of service flaw was found in the implementation of associative arrays (hashes) in Ruby. An attacker able to supply a large number of inputs to a Ruby application (such as HTTP POST request parameters sent to a web application) that are used as keys when inserting data into an array could trigger multiple hash function collisions, making array operations take an excessive amount of CPU time. To mitigate this issue, randomization has been added to the hash function to reduce the chance of an attacker successfully causing intentional collisions. (CVE-2011-4815)

It was found that Ruby did not reinitialize the PRNG (pseudorandom number generator) after forking a child process. This could eventually lead to the PRNG returning the same result twice. An attacker keeping track of the values returned by one child process could use this flaw to predict the values the PRNG would return in other child processes (as long as the parent process persisted). (CVE-2011-3009)

Red Hat would like to thank oCERT for reporting CVE-2011-4815. oCERT acknowledges Julian Walde and Alexander Klink as the original reporters of CVE-2011-4815.

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

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 This content is not included.https://access.redhat.com/kb/docs/DOC-11259

Affected Products

Updated Packages

• ruby-mode-1.8.1-18.el4.ppc.rpm
• ruby-devel-1.8.1-18.el4.i386.rpm
• ruby-docs-1.8.1-18.el4.ppc.rpm
• ruby-rdoc-1.8.5-22.el5_7.1.i386.rpm
• ruby-1.8.5-22.el5_7.1.x86_64.rpm
• ruby-tcltk-1.8.5-22.el5_7.1.ppc.rpm
• ruby-libs-1.8.5-22.el5_7.1.ppc64.rpm
• ruby-tcltk-1.8.5-22.el5_7.1.s390x.rpm
• ruby-1.8.5-22.el5_7.1.ia64.rpm
• ruby-devel-1.8.5-22.el5_7.1.ppc.rpm
• ruby-libs-1.8.1-18.el4.s390.rpm
• ruby-irb-1.8.5-22.el5_7.1.s390x.rpm
• ruby-devel-1.8.1-18.el4.ppc.rpm
• ruby-docs-1.8.1-18.el4.s390.rpm
• ruby-libs-1.8.1-18.el4.ppc64.rpm
• irb-1.8.1-18.el4.ia64.rpm
• ruby-tcltk-1.8.5-22.el5_7.1.x86_64.rpm
• ruby-ri-1.8.5-22.el5_7.1.ppc.rpm
• ruby-ri-1.8.5-22.el5_7.1.s390x.rpm
• ruby-irb-1.8.5-22.el5_7.1.x86_64.rpm
• ruby-docs-1.8.1-18.el4.s390x.rpm
• ruby-docs-1.8.5-22.el5_7.1.ia64.rpm
• ruby-mode-1.8.5-22.el5_7.1.ia64.rpm
• ruby-rdoc-1.8.5-22.el5_7.1.ia64.rpm
• ruby-libs-1.8.5-22.el5_7.1.s390x.rpm
• ruby-libs-1.8.5-22.el5_7.1.s390.rpm
• ruby-devel-1.8.5-22.el5_7.1.s390.rpm
• ruby-1.8.1-18.el4.ppc.rpm
• ruby-libs-1.8.1-18.el4.s390x.rpm
• ruby-1.8.5-22.el5_7.1.i386.rpm
• ruby-1.8.5-22.el5_7.1.s390x.rpm
• ruby-libs-1.8.1-18.el4.i386.rpm
• ruby-mode-1.8.1-18.el4.s390x.rpm
• ruby-docs-1.8.5-22.el5_7.1.i386.rpm
• ruby-mode-1.8.1-18.el4.i386.rpm
• ruby-1.8.5-22.el5_7.1.ppc.rpm
• irb-1.8.1-18.el4.s390.rpm
• ruby-docs-1.8.5-22.el5_7.1.s390x.rpm
• ruby-mode-1.8.1-18.el4.x86_64.rpm
• ruby-tcltk-1.8.1-18.el4.ia64.rpm
• ruby-devel-1.8.5-22.el5_7.1.i386.rpm
• ruby-devel-1.8.5-22.el5_7.1.ia64.rpm
• ruby-docs-1.8.5-22.el5_7.1.ppc.rpm
• ruby-tcltk-1.8.5-22.el5_7.1.i386.rpm
• ruby-1.8.1-18.el4.x86_64.rpm
• ruby-libs-1.8.1-18.el4.ia64.rpm
• ruby-docs-1.8.1-18.el4.i386.rpm
• ruby-tcltk-1.8.1-18.el4.ppc.rpm
• ruby-tcltk-1.8.1-18.el4.s390.rpm
• ruby-mode-1.8.5-22.el5_7.1.ppc.rpm
• ruby-devel-1.8.5-22.el5_7.1.ppc64.rpm
• ruby-ri-1.8.5-22.el5_7.1.ia64.rpm
• ruby-devel-1.8.1-18.el4.x86_64.rpm
• ruby-docs-1.8.1-18.el4.ia64.rpm
• ruby-mode-1.8.5-22.el5_7.1.s390x.rpm
• ruby-rdoc-1.8.5-22.el5_7.1.ppc.rpm
• ruby-docs-1.8.1-18.el4.x86_64.rpm
• ruby-tcltk-1.8.1-18.el4.s390x.rpm
• ruby-irb-1.8.5-22.el5_7.1.i386.rpm
• ruby-devel-1.8.5-22.el5_7.1.x86_64.rpm
• ruby-1.8.1-18.el4.s390x.rpm
• ruby-1.8.1-18.el4.src.rpm
• ruby-devel-1.8.1-18.el4.ia64.rpm
• ruby-ri-1.8.5-22.el5_7.1.i386.rpm
• ruby-tcltk-1.8.1-18.el4.x86_64.rpm
• ruby-rdoc-1.8.5-22.el5_7.1.s390x.rpm
• ruby-tcltk-1.8.5-22.el5_7.1.ia64.rpm
• ruby-libs-1.8.5-22.el5_7.1.ppc.rpm
• ruby-1.8.1-18.el4.i386.rpm
• irb-1.8.1-18.el4.s390x.rpm
• ruby-mode-1.8.1-18.el4.ia64.rpm
• ruby-libs-1.8.1-18.el4.ppc.rpm
• ruby-mode-1.8.5-22.el5_7.1.x86_64.rpm
• ruby-rdoc-1.8.5-22.el5_7.1.x86_64.rpm
• ruby-tcltk-1.8.1-18.el4.i386.rpm
• ruby-libs-1.8.5-22.el5_7.1.i386.rpm
• ruby-1.8.5-22.el5_7.1.src.rpm
• ruby-irb-1.8.5-22.el5_7.1.ppc.rpm
• ruby-mode-1.8.5-22.el5_7.1.i386.rpm
• ruby-devel-1.8.1-18.el4.s390x.rpm
• ruby-devel-1.8.5-22.el5_7.1.s390x.rpm
• ruby-libs-1.8.5-22.el5_7.1.ia64.rpm
• ruby-libs-1.8.1-18.el4.x86_64.rpm
• irb-1.8.1-18.el4.ppc.rpm
• ruby-devel-1.8.1-18.el4.s390.rpm
• irb-1.8.1-18.el4.x86_64.rpm
• ruby-irb-1.8.5-22.el5_7.1.ia64.rpm
• ruby-mode-1.8.1-18.el4.s390.rpm
• ruby-ri-1.8.5-22.el5_7.1.x86_64.rpm
• ruby-1.8.1-18.el4.s390.rpm
• ruby-libs-1.8.5-22.el5_7.1.x86_64.rpm
• irb-1.8.1-18.el4.i386.rpm
• ruby-docs-1.8.5-22.el5_7.1.x86_64.rpm
• ruby-1.8.1-18.el4.ia64.rpm

Fixes

• This content is not included.BZ - 722415
• This content is not included.BZ - 750564

CVEs

• CVE-2011-3009
• CVE-2011-4815

References

• https://access.redhat.com/security/updates/classification/#moderate
• Content from www.ocert.org is not included.Content from www.ocert.org is not included.http://www.ocert.org/advisories/ocert-2011-003.html

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.