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Category:   Application (Generic)  >   Perl Vendors:   Wall, Larry
(Red Hat Issues Fix) Perl UTF8 Regex Processing Double Free Bug May Let Users Execute Arbitrary Code
SecurityTracker Alert ID:  1020302
SecurityTracker URL:  http://securitytracker.com/id/1020302
CVE Reference:   CVE-2008-1927   (Links to External Site)
Date:  Jun 17 2008
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, User access via local system, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.8.8
Description:   A vulnerability was reported in Perl. A user may be able to execute arbitrary code on the target system.

A user can supply a specially crafted regular expression containing UTF8 characters to trigger a double free and execute arbitrary code on the target system with the privileges of the process running perl.

steev at hot.pl reported this vulnerability.

Impact:   A user may be able to execute arbitrary code on the target system.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2008-0532.html

Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  4

Message History:   This archive entry is a follow-up to the message listed below.
Jun 12 2008 Perl UTF8 Regex Processing Double Free Bug May Let Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2008:0532-01] Important: perl security update


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

Synopsis:          Important: perl security update
Advisory ID:       RHSA-2008:0532-01
Product:           Red Hat Application Stack
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2008-0532.html
Issue date:        2008-06-17
CVE Names:         CVE-2008-1927 
=====================================================================

1. Summary:

Updated perl packages that fix a security issue are now available for Red
Hat Application Stack v1.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Application Stack v1 for Enterprise Linux AS (v.4) - i386, x86_64
Red Hat Application Stack v1 for Enterprise Linux ES (v.4) - i386, x86_64

3. Description:

Perl is a high-level programming language commonly used for system
administration utilities and Web programming.

A flaw was found in Perl's regular expression engine. A specially crafted
regular expression with Unicode characters could trigger a buffer overflow,
causing Perl to crash, or possibly execute arbitrary code with the
privileges of the user running Perl. (CVE-2008-1927)

Users of perl are advised to upgrade to these updated packages, which
contain a backported patch to resolve this issue.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network.  Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

5. Bugs fixed (http://bugzilla.redhat.com/):

443928 - CVE-2008-1927 perl: heap corruption by regular expressions with utf8 characters

6. Package List:

Red Hat Application Stack v1 for Enterprise Linux AS (v.4):

Source:
ftp://updates.redhat.com/enterprise/4AS/en/RHWAS/SRPMS/perl-5.8.8-6.el4s1_3.src.rpm

i386:
perl-5.8.8-6.el4s1_3.i386.rpm
perl-debuginfo-5.8.8-6.el4s1_3.i386.rpm
perl-suidperl-5.8.8-6.el4s1_3.i386.rpm

x86_64:
perl-5.8.8-6.el4s1_3.x86_64.rpm
perl-debuginfo-5.8.8-6.el4s1_3.x86_64.rpm
perl-suidperl-5.8.8-6.el4s1_3.x86_64.rpm

Red Hat Application Stack v1 for Enterprise Linux ES (v.4):

Source:
ftp://updates.redhat.com/enterprise/4ES/en/RHWAS/SRPMS/perl-5.8.8-6.el4s1_3.src.rpm

i386:
perl-5.8.8-6.el4s1_3.i386.rpm
perl-debuginfo-5.8.8-6.el4s1_3.i386.rpm
perl-suidperl-5.8.8-6.el4s1_3.i386.rpm

x86_64:
perl-5.8.8-6.el4s1_3.x86_64.rpm
perl-debuginfo-5.8.8-6.el4s1_3.x86_64.rpm
perl-suidperl-5.8.8-6.el4s1_3.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1927
http://www.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2008 Red Hat, Inc.
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