Synopsis

Moderate: perl security update

Type/Severity

Security Advisory: Moderate

Topic

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.

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 Rafael
Garcia-Suarez as the original reporters of CVE-2010-1447.

These packages upgrade the Safe extension module to version 2.27. Refer to
the Safe module's Changes file, linked to in the References, for a full
list of changes.

Users of perl are advised to upgrade to these updated packages, which
correct these issues. All applications using the Safe or File::Path modules
must be restarted for this update to take effect.

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
http://kbase.redhat.com/faq/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 473450 - CVE-2008-5302 perl: File::Path rmtree race condition (CVE-2005-0448) reintroduced after upstream rebase to 5.8.8-1
• BZ - 474217 - CVE-2008-5303 symlink perl: File::Path rmtree race condition (CVE-2004-0452) reintroduced after upstream rebase to 5.8.8-1
• BZ - 576508 - CVE-2010-1168 perl Safe: Intended restriction bypass via object references
• BZ - 588269 - CVE-2010-1447 perl: Safe restriction bypass when reference to subroutine in compartment is called from outside

CVEs

• CVE-2010-1447
• CVE-2010-1168
• CVE-2008-5303
• CVE-2008-5302

References

• http://www.redhat.com/security/updates/classification/#moderate
• http://cpansearch.perl.org/src/RGARCIA/Safe-2.27/Changes

Red Hat Enterprise Linux Server 5

SRPM
perl-5.8.8-32.el5_5.1.src.rpm	SHA-256: f41fc8685e2ed5ec135616f27d00a4aa3de1c9ba7fcba22fdb75d120af67731d
x86_64
perl-5.8.8-32.el5_5.1.x86_64.rpm	SHA-256: 9fa2a32b6d525c12396770f6ea2c3c489a790b86cebee39139655c30a63e2e36
perl-suidperl-5.8.8-32.el5_5.1.x86_64.rpm	SHA-256: b574c01e23f1ea382c7b0690387f8c91a874863a566b1e5022c9df002e9b7f03
ia64
perl-5.8.8-32.el5_5.1.ia64.rpm	SHA-256: 777408d31670d6a93380ca29633a23432b26a6f04f26fe38879cda93658c826b
perl-suidperl-5.8.8-32.el5_5.1.ia64.rpm	SHA-256: 7a9653e2111579e8ed81903f7578c23cf4d0ce6730067d78e8e9cb7556ee0589
i386
perl-5.8.8-32.el5_5.1.i386.rpm	SHA-256: 83fc67f09115d985ebe6e221126954a9bc5446cbb46285ad7188b722ca339836
perl-suidperl-5.8.8-32.el5_5.1.i386.rpm	SHA-256: 63a89fbcd34e830621ca5c71aab196560daa9cde3d0b35e68448c02b4061a451

Red Hat Enterprise Linux Workstation 5

SRPM
perl-5.8.8-32.el5_5.1.src.rpm	SHA-256: f41fc8685e2ed5ec135616f27d00a4aa3de1c9ba7fcba22fdb75d120af67731d
x86_64
perl-5.8.8-32.el5_5.1.i386.rpm	SHA-256: 83fc67f09115d985ebe6e221126954a9bc5446cbb46285ad7188b722ca339836
perl-5.8.8-32.el5_5.1.x86_64.rpm	SHA-256: 9fa2a32b6d525c12396770f6ea2c3c489a790b86cebee39139655c30a63e2e36
perl-suidperl-5.8.8-32.el5_5.1.x86_64.rpm	SHA-256: b574c01e23f1ea382c7b0690387f8c91a874863a566b1e5022c9df002e9b7f03
i386
perl-5.8.8-32.el5_5.1.i386.rpm	SHA-256: 83fc67f09115d985ebe6e221126954a9bc5446cbb46285ad7188b722ca339836
perl-suidperl-5.8.8-32.el5_5.1.i386.rpm	SHA-256: 63a89fbcd34e830621ca5c71aab196560daa9cde3d0b35e68448c02b4061a451

Red Hat Enterprise Linux Desktop 5

SRPM
perl-5.8.8-32.el5_5.1.src.rpm	SHA-256: f41fc8685e2ed5ec135616f27d00a4aa3de1c9ba7fcba22fdb75d120af67731d
x86_64
perl-5.8.8-32.el5_5.1.i386.rpm	SHA-256: 83fc67f09115d985ebe6e221126954a9bc5446cbb46285ad7188b722ca339836
perl-5.8.8-32.el5_5.1.x86_64.rpm	SHA-256: 9fa2a32b6d525c12396770f6ea2c3c489a790b86cebee39139655c30a63e2e36
perl-suidperl-5.8.8-32.el5_5.1.x86_64.rpm	SHA-256: b574c01e23f1ea382c7b0690387f8c91a874863a566b1e5022c9df002e9b7f03
i386
perl-5.8.8-32.el5_5.1.i386.rpm	SHA-256: 83fc67f09115d985ebe6e221126954a9bc5446cbb46285ad7188b722ca339836
perl-suidperl-5.8.8-32.el5_5.1.i386.rpm	SHA-256: 63a89fbcd34e830621ca5c71aab196560daa9cde3d0b35e68448c02b4061a451

Red Hat Enterprise Linux for IBM z Systems 5

SRPM
perl-5.8.8-32.el5_5.1.src.rpm	SHA-256: f41fc8685e2ed5ec135616f27d00a4aa3de1c9ba7fcba22fdb75d120af67731d
s390x
perl-5.8.8-32.el5_5.1.s390x.rpm	SHA-256: 5e0bf507e4d06b39e64862d3c8d576da61b17c3b24650222c4c536ac852b84e3
perl-suidperl-5.8.8-32.el5_5.1.s390x.rpm	SHA-256: df0c7a61699ec0d28c508ba7d8b43be6acd8c43a5e7dba823b93185da53634f0

Red Hat Enterprise Linux for Power, big endian 5

SRPM
perl-5.8.8-32.el5_5.1.src.rpm	SHA-256: f41fc8685e2ed5ec135616f27d00a4aa3de1c9ba7fcba22fdb75d120af67731d
ppc
perl-5.8.8-32.el5_5.1.ppc.rpm	SHA-256: baa313c4ac48bdd768f436cb2092179ab45eacaa6b8346230107684f8032cea1
perl-suidperl-5.8.8-32.el5_5.1.ppc.rpm	SHA-256: ef8a58aeed73443f39d29086619bfffa8d9a4b9ad3a6a5e58a4ec2973a29782a

Red Hat Enterprise Linux Server from RHUI 5

SRPM
perl-5.8.8-32.el5_5.1.src.rpm	SHA-256: f41fc8685e2ed5ec135616f27d00a4aa3de1c9ba7fcba22fdb75d120af67731d
x86_64
perl-5.8.8-32.el5_5.1.x86_64.rpm	SHA-256: 9fa2a32b6d525c12396770f6ea2c3c489a790b86cebee39139655c30a63e2e36
perl-suidperl-5.8.8-32.el5_5.1.x86_64.rpm	SHA-256: b574c01e23f1ea382c7b0690387f8c91a874863a566b1e5022c9df002e9b7f03
i386
perl-5.8.8-32.el5_5.1.i386.rpm	SHA-256: 83fc67f09115d985ebe6e221126954a9bc5446cbb46285ad7188b722ca339836
perl-suidperl-5.8.8-32.el5_5.1.i386.rpm	SHA-256: 63a89fbcd34e830621ca5c71aab196560daa9cde3d0b35e68448c02b4061a451