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

Synopsis:          Moderate: perl security update
Advisory ID:       RHSA-2010:0458-02
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2010:0458.html
Issue date:        2010-06-07
CVE Names:         CVE-2008-5302 CVE-2008-5303 CVE-2010-1168 
                   CVE-2010-1447 
====================================================================
1. Summary:

Updated perl packages that fix multiple security issues are now available
for Red Hat Enterprise Linux 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

Perl is a high-level programming language commonly used for system
administration utilities and web programming. The Safe extension module
allows users to compile and execute Perl code in restricted compartments.
The File::Path module allows users to create and remove directory trees.

The Safe module did not properly restrict the code of implicitly called
methods (such as DESTROY and AUTOLOAD) on implicitly blessed objects
returned as a result of unsafe code evaluation. These methods could have
been executed unrestricted by Safe when such objects were accessed or
destroyed. A specially-crafted Perl script executed inside of a Safe
compartment could use this flaw to bypass intended Safe module
restrictions. (CVE-2010-1168)

The Safe module did not properly restrict code compiled in a Safe
compartment and executed out of the compartment via a subroutine reference
returned as a result of unsafe code evaluation. A specially-crafted Perl
script executed inside of a Safe compartment could use this flaw to bypass
intended Safe module restrictions, if the returned subroutine reference was
called from outside of the compartment. (CVE-2010-1447)

Multiple race conditions were found in the way the File::Path module's
rmtree function removed directory trees. A malicious, local user with write
access to a directory being removed by a victim, running a Perl script
using rmtree, could cause the permissions of arbitrary files to be changed
to world-writable and setuid, or delete arbitrary files via a symbolic link
attack, if the victim had the privileges to change the permissions of the
target files or to remove them. (CVE-2008-5302, CVE-2008-5303)

Red Hat would like to thank Tim Bunce for responsibly reporting the
CVE-2010-1168 and CVE-2010-1447 issues. Upstream acknowledges Nick Cleaton
as the original reporter of CVE-2010-1168, and Tim Bunce and Rafa