RHEL 6 : ruby (RHSA-2011:1581)

This script is Copyright (C) 2011-2014 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated ruby packages that fix two security issues, various bugs, and
add one enhancement are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having low
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.

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

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)

A flaw was found in the Ruby SecureRandom module. When using the
SecureRandom.random_bytes class, the PRNG state was not modified after
forking a child process. This could eventually lead to
SecureRandom.random_bytes returning the same string more than once. An
attacker keeping track of the strings returned by one child process
could use this flaw to predict the strings SecureRandom.random_bytes
would return in other child processes (as long as the parent process
persisted). (CVE-2011-2705)

This update also fixes the following bugs :

* The ruby package has been upgraded to upstream point release
1.8.7-p352, which provides a number of bug fixes over the previous
version. (BZ#706332)

* The MD5 message-digest algorithm is not a FIPS-approved algorithm.
Consequently, when a Ruby script attempted to calculate an MD5
checksum in FIPS mode, the interpreter terminated unexpectedly. This
bug has been fixed and an exception is now raised in the described
scenario. (BZ#717709)

* Due to inappropriately handled line continuations in the mkconfig.rb
source file, an attempt to build the ruby package resulted in
unexpected termination. An upstream patch has been applied to address
this issue and the ruby package can now be built properly. (BZ#730287)

* When the 32-bit ruby-libs library was installed on a 64-bit machine,
the mkmf library failed to load various modules necessary for building
Ruby-related packages. This bug has been fixed and mkmf now works
properly in the described scenario. (BZ#674787)

* Previously, the load paths for scripts and binary modules were
duplicated on the i386 architecture. Consequently, an ActiveSupport
test failed. With this update, the load paths are no longer stored in
duplicates on the i386 architecture. (BZ#722887)

This update also adds the following enhancement :

* With this update, SystemTap probes have been added to the ruby
package. (BZ#673162)

All users of ruby are advised to upgrade to these updated packages,
which resolve these issues and add this enhancement.

See also :

https://www.redhat.com/security/data/cve/CVE-2011-2705.html
https://www.redhat.com/security/data/cve/CVE-2011-3009.html
http://rhn.redhat.com/errata/RHSA-2011-1581.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N)
CVSS Temporal Score : 4.1
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 57017 ()

Bugtraq ID: 49015
49126

CVE ID: CVE-2011-2705
CVE-2011-3009