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IBM SECURITY ADVISORY

First Issued: Wed Nov 20 13:06:27 CST 2013
|Updated: Wed Dec 4 10:00:31 CST 2013
|Update: Corrected CVSS scoring information for CVEs
|Update: Includes AIX 5.3 in appropriate places

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/perl_advisory3.asc

                       VULNERABILITY SUMMARY

VULNERABILITY: Security vulnerabilities in Perl for AIX

| PLATFORMS: 5.3, 6.1 and 7.1

SOLUTION: Apply the fix as described below.

THREAT: See below.

CVE Number: CVE-2012-5526
CVE-2013-1667

Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO

                       DETAILED INFORMATION

I. DESCRIPTION

CVE-2012-5526
-------------
Perl does not properly escape newlines in (1) Set-Cookie or (2) P3P 
headers, which might allow remote attackers to inject arbitrary headers 
into responses from applications that use CGI.pm

CVE-2013-1667
-------------
The rehash mechanism in Perl 5.8.2 through 5.16.x allows 
context-dependent attackers to cause a denial of service (memory 
consumption and crash) via a crafted hash key.

II. CVSS

| CVE-2012-5526
| CVSS Base Score: 4.3
| CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/80098 for
| the current score
| CVSS Environmental Score*: Undefined
| CVSS String: (AV:N/AC:M/Au:N/C:N/I:P/A:N)

| CVE-2013-1667
| CVSS Base Score: 4.3
| CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/82598 for the
| current score
| CVSS Environmental Score*: Undefined
| CVSS String:(AV:N/AC:M/Au:N/C:N/I:N/A:P)

III. PLATFORM VULNERABILITY ASSESSMENT

To determine if your system is vulnerable, run the following
command:

# lslpp -l perl.rte

The following fileset levels are vulnerable:

AIX Fileset        AIX Level       Lower Level       Upper Level
----------------------------------------------------------------

| perl.rte 5.3.12 5.8.8.0 5.8.8.123
perl.rte 6.1.7 5.8.8.0 5.8.8.122
perl.rte 6.1.8 5.8.8.0 5.8.8.244
perl.rte 7.1.1 5.10.1.0 5.10.1.100
perl.rte 7.1.2 5.10.1.0 5.10.1.150

NOTE: Affected customers are urged to upgrade to the latest
applicable Technology Level and Service Pack.

IV. SOLUTIONS

A. APARS

    IBM has assigned the following APARs to this problem:

    AIX Level           APAR number        Availability
    ---------------------------------------------------

| 5.3.12 IV43973 NOW
6.1.8 IV43973 NOW
7.1.2 IV46765 NOW

    Subscribe to the APARs here:

    http://www.ibm.com/support/docview.wss?uid=isg1IV43973
    http://www.ibm.com/support/docview.wss?uid=isg1IV46765

    By subscribing, you will receive periodic email alerting you
    to the status of the APAR, and a link to download the fix once
    it becomes available.

B. FIXES

    Fixes are available.  The fixes can be downloaded via http
    from:

	https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=aixbp

	The perl name provided in the web pack site

| For 5.3: perl61.zip
For 6.1: perl61.zip
For 7.1: perl71.zip

    To extract the fixes from the zip files:

| For 5.3: gunzip -S .zip perl61.zip
For 6.1: gunzip -S .zip perl61.zip
For 7.1: gunzip -S .zip perl71.zip

	IMPORTANT: It is recommended that a mksysb backup of the system be
	created. Verify that this image is both bootable and readable
	before proceeding.

	To preview the fix installation:

		installp -apYd . perl			

	To install the fix package:

		installp -aXYd . perl

V. WORKAROUNDS

 There are no workarounds.

VI. CONTACT INFORMATION

If you would like to receive AIX Security Advisories via email,
please visit:

http://www.ibm.com/support/mynotifications

To view previously issued advisories, please visit:

    http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq

Comments regarding the content of this announcement can be
directed to:

    [email protected]

To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:

    A. Send an email with "get key" in the subject line to:

        [email protected]

    B. Download the key from our web page:

http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt

    C. Download the key from a PGP Public Key Server. The key ID is:

        0x28BFAA12

Please contact your local IBM AIX support center for any
assistance.

eServer is a trademark of International Business Machines
Corporation.  IBM, AIX and pSeries are registered trademarks of
International Business Machines Corporation.  All other trademarks
are property of their respective holders.

VII. ACKNOWLEDGMENTS

IBM discovered and fixed this vulnerability as part of its
commitment to secure the AIX operating system.

VIII. REFERENCES:

Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2

| X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/80098
| X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/82598
CVE-2012-5526: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-5526
CVE-2013-1667: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1667

*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the
impact of this vulnerability in their environments by accessing the links
in the Reference section of this Flash.

Note: According to the Forum of Incident Response and Security Teams
(FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry
open standard designed to convey vulnerability severity and help to
determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES
"AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE
RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY
VULNERABILITY.

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