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Test ID:1.3.6.1.4.1.25623.1.0.870638
Category:Red Hat Local Security Checks
Title:RedHat Update for ruby RHSA-2012:0069-01
Summary:The remote host is missing an update for the 'ruby'; package(s) announced via the referenced advisory.
Description:Summary:
The remote host is missing an update for the 'ruby'
package(s) announced via the referenced advisory.

Vulnerability Insight:
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)

Red Hat would like to thank oCERT for reporting this issue. oCERT
acknowledges Julian Waelde and Alexander Klink as the original reporters.

All users of ruby are advised to upgrade to these updated packages, which
contain a backported patch to resolve this issue.

Affected Software/OS:
ruby on Red Hat Enterprise Linux Desktop (v. 6),
Red Hat Enterprise Linux Server (v. 6),
Red Hat Enterprise Linux Workstation (v. 6)

Solution:
Please Install the Updated Packages.

CVSS Score:
7.8

CVSS Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-4815
http://lists.apple.com/archives/security-announce/2012/May/msg00001.html
Bugtraq: 20111228 n.runs-SA-2011.004 - web programming languages and platforms - DoS through hash table (Google Search)
http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html
CERT/CC vulnerability note: VU#903934
http://www.kb.cert.org/vuls/id/903934
http://jvn.jp/en/jp/JVN90615481/index.html
http://jvndb.jvn.jp/ja/contents/2012/JVNDB-2012-000066.html
http://www.nruns.com/_downloads/advisory28122011.pdf
http://www.ocert.org/advisories/ocert-2011-003.html
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/391606
RedHat Security Advisories: RHSA-2012:0069
http://rhn.redhat.com/errata/RHSA-2012-0069.html
RedHat Security Advisories: RHSA-2012:0070
http://rhn.redhat.com/errata/RHSA-2012-0070.html
http://www.securitytracker.com/id?1026474
http://secunia.com/advisories/47405
http://secunia.com/advisories/47822
XForce ISS Database: ruby-hash-dos(72020)
https://exchange.xforce.ibmcloud.com/vulnerabilities/72020
CopyrightCopyright (c) 2012 Greenbone Networks GmbH

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