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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2011.1178.2
Perl Digest Module "Digest->new()" Code Injection Vulnerability
29 January 2013
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Perl
Publisher: IBM
Operating System: AIX
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2011-3597
Reference: ESB-2011.1102
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/perl_advisory2.asc
Revision History: January 29 2013: Fixed vulnerable fileset levels,
Added VIOS Levels under section V for
Interim Fixes,
Fixed availability dates
November 24 2011: Initial Release
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IBM SECURITY ADVISORY
First Issued: Mon Nov 22 15:00:14 CST 2011
| Updated: Fri Jan 25 13:39:30 CST 2013
| Fixed vulnerable fileset levels
| Added VIOS Levels under section V for Interim Fixes
| Fixed availability dates
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/perl_advisory2.asc
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: Perl Digest Module "Digest->new()" Code Injection Vulnerability
PLATFORMS: AIX 5.3, 6.1, 7.1
SOLUTION: Apply the fix as described below.
THREAT: A remote attacker may run arbitrary code.
CERT VU Number: n/a
CVE Number: CVE-2011-3597
===============================================================================
DETAILED INFORMATION
I. OVERVIEW
Perl is a free software scripting language interpreter providing a
rich set of features provided as part of the base AIX Operating
System environment.
II. DESCRIPTION
The Digest module for Perl is prone to a vulnerability that will let
attackers inject and execute arbitrary Perl code.
Remote attackers can exploit this issue to run arbitrary code in the
context of the affected application.
Digest versions prior to 1.17 are affected.
For more details please visit:
http://www.securityfocus.com/bid/49911
https://secunia.com/advisories/46279
III. IMPACT
The successful exploitation of this vulnerability allows a remote
attacker to execute arbitrary code.
IV. 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 5.8.8.122
| perl.rte 6.1.5 5.8.8.0 5.8.8.122
| perl.rte 6.1.6 5.8.8.0 5.8.8.122
| 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 7.1.0 5.10.1.0 5.10.1.50
| perl.rte 7.1.1 5.10.1.0 5.10.1.50
| 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.
V. SOLUTIONS
A. APARS
IBM provides the following fixes:
AIX Level APAR number Availability
---------------------------------------------------
6.1.8 IV10197 06/28/13 sp3
7.1.2 IV10197 08/09/13 sp3
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IV10197
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.
NOTE: Affected customers are urged to upgrade to the latest
applicable Technology Level and Service Pack.
B. INTERIM FIXES
Interim fixes are available. The interim fix can be
downloaded via ftp from:
ftp://aix.software.ibm.com/aix/efixes/security/perl_ifix2.tar
The link above is to a tar file containing this signed
advisory, interim fix packages, and PGP signatures for each
package. The interim fixes below include prerequisite
checking. This will enforce the correct mapping between the
fixes and AIX Technology Levels.
AIX Level VIOS Level Fix
-----------------------------------------------------------------
5.3.12 IV10197610.111107.epkg.Z
| 6.1.5 2.1.3 IV10197610.111107.epkg.Z
| 6.1.6 2.2.0 IV10197610.111107.epkg.Z
| 6.1.7 2.2.1 IV10197610.111107.epkg.Z
| 6.1.8 IV10197610.111107.epkg.Z
7.1.0 IV10197710.111107.epkg.Z
7.1.1 IV10197710.111107.epkg.Z
| 7.1.2 IV10197610.111107.epkg.Z
IMPORTANT: If possible, it is recommended that a mksysb backup
of the system be created. Verify it is both bootable and
readable before proceeding.
These interim fixes have not been fully regression tested;
thus, IBM does not warrant the fully correct functionality of
the interim fix.
Verify you have retrieved the fixes intact:
The checksums below were generated using the "sum", "cksum",
"csum -h MD5" (md5sum), and "csum -h SHA1" (sha1sum) commands
and are as follows:
sum filename
------------------------------------
55198 9 IV10197610.111107.epkg.Z
15391 9 IV10197710.111107.epkg.Z
cksum filename
------------------------------------------
3148530716 8536 IV10197610.111107.epkg.Z
4016406856 8879 IV10197710.111107.epkg.Z
csum -h MD5 (md5sum) filename
----------------------------------------------------------
152ccb72817ecf0ee0cc7116e512fb40 IV10197610.111107.epkg.Z
csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
c0e33bdc5b9476cc9fdb1dc05812f6fd63655fd7 IV10197610.111107.epkg.Z
df3a664147c404ae5ea07aab86655626e5a59383 IV10197710.111107.epkg.Z
To verify the sums, use the text of this advisory as input to
csum, md5sum, or sha1sum. For example:
csum -h SHA1 -i Advisory.asc
md5sum -c Advisory.asc
sha1sum -c Advisory.asc
These sums should match exactly. The PGP signatures in the
compressed tarball and on this advisory can also be used to
verify the integrity of the various files they correspond to.
If the sums or signatures cannot be confirmed, double check
the command results and the download site address. If those
are OK, contact IBM AIX Security at
security-alert@austin.ibm.com and describe the discrepancy.
C. INTERIM FIX INSTALLATION
These packages use the new Interim Fix Management Solution to
install and manage interim fixes. More information can be
found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview an epkg interim fix installation execute the
following command:
# emgr -e ipkg_name -p # where ipkg_name is the name of the
# interim fix package being previewed.
To install an epkg interim fix package, execute the following
command:
# emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.
The "X" flag will expand any filesystems if required.
VI. WORKAROUNDS
None.
VII. OBTAINING FIXES
AIX Version 5 APARs can be downloaded from:
http://www.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix
Security related Interim Fixes can be downloaded from:
ftp://aix.software.ibm.com/aix/efixes/security
VIII. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
Comments regarding the content of this announcement can be
directed to:
security-alert@austin.ibm.com
To request 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:
security-alert@austin.ibm.com
B. 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.
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