ID: 3522
Date: 19/12/2007
Title: 3522 - AIX Perl buffer overflow vulnerability
Platform level affected:Operating System
Specific operating systems components affected: Unix
Other software: Run-time Environment
Remediation Summary:Update your copy of the software with the download available from the supplier.
Vendors affected:IBM
Applications affected:perl
Adversity source: Unknown
Attack Vector: Vulnerability exploitation
Virulence: Unknown
Warning Status: Unknown
Potential Damage: Remote execution/modification
Possible Duration: Unknown
Availability of fix: Available
Type of fix: Patch
Source: IBM
Reliability of source: Trusted
Source URL: http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html
Abstract: Description of a buffer overflow vulnerability that exists in the IBM AIX 'perl.rte' fileset.
AIX 5.3 : Security advisories (2007.12.18)
AIX Perl buffer overflow vulnerability
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
IBM SECURITY ADVISORY
First Issued: Tue Dec 18 11:33:00 CST 2007 ===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: AIX Perl buffer overflow vulnerability
PLATFORMS: AIX 5.2, 5.3, 6.1
SOLUTION: Apply the APAR, interim fix or workaround as
described below.
THREAT: A remote attacker may run arbitrary code.
CERT VU Number: n/a
CVE Number: CVE-2007-5116
===============================================================================
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
A buffer overflow vulnerability exists in the 'perl.rte' fileset.
A remote attacker may execute arbitrary code if a Perl script
executing on the system is listening on a network port. If
exploited the attacker can execute arbitrary code with the same
privileges as the script.
For more details please visit:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5116
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 5.2.0 5.8.0.0 5.8.0.106
perl.rte 5.3.0 5.8.2.0 5.8.2.70
perl.rte 6.1.0 5.8.2.70 5.8.2.70
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
---------------------------------------------------
5.2 IZ10220 05/14/2008
5.3 through TL06 IZ10244 02/06/2008
5.3 TL07 IZ10244 02/06/2008
6.1 IZ10244 02/20/2008
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IZ10220
http://www.ibm.com/support/docview.wss?uid=isg1IZ10244
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.
AIX Version 5 APARs can be downloaded from:
http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html
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_ifix.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 Fileset AIX Release and Interim fix
Technology Level
-----------------------------------------------------------------
perl.rte 5200-08 IZ10220.071206.epkg.Z
perl.rte 5200-09 IZ10220.071206.epkg.Z
perl.rte 5200-10 IZ10220.071206.epkg.Z
perl.rte 5300-05 IZ10244.071206.epkg.Z
perl.rte 5300-06 IZ10244.071206.epkg.Z
perl.rte 5300-07 IZ10244.071206.epkg.Z
perl.rte 6100-00 (same as 53) IZ10244.071206.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
------------------------------------
21674 5683 IZ10220.071206.epkg.Z
43658 5880 IZ10244.071206.epkg.Z
cksum filename
------------------------------------------
3383682558 5819246 IZ10220.071206.epkg.Z
4001149063 6020447 IZ10244.071206.epkg.Z
csum -h MD5 (md5sum) filename
----------------------------------------------------------
208b132ee3ff67d7ac4641e1ef9b5c6b IZ10220.071206.epkg.Z
42e6ae761b9ec36ad653a3fa294fd184 IZ10244.071206.epkg.Z
csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
aea47a5acc29ad3b5eee23de3cee47d53706e79a IZ10220.071206.epkg.Z
21db9fa9b433a2fc62d7897dab2c1a62e55a6a9e IZ10244.071206.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
If you are running perl network services there are no known
workarounds. If the perl services are not needed and are running,
shut them down.
VII. OBTAINING FIXES
AIX Version 5 APARs can be downloaded from:
http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html
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:
0xA6A36CCC
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.
IX. ACKNOWLEDGMENTS
Tavis Ormandy and Will Drewry are credited with the discovery of
this issue.
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---------------------------------------------------------------------
Related URLs:
Find end of support dates for AIX and software running on AIX
http://www.ibm.com/services/sl/products
Visit Unix Servers Support for a wide array of technical resources.
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Download fixes for AIX V5 and 4.3 OS, Java, Compilers:
http://www-912.ibm.com/eserver/support/fixes/
This advisory contains information released by the original author. Some of the information may have changed since it was released. If the issue affects you, it may be prudent to retrieve the advisory from the site of the original source to ensure that you receive the most current information concerning that problem. Reference to any specific commercial product, process, or service by trade name, trademark manufacturer, or otherwise, does not constitute or imply its endorsement, recommendation, or favouring by CPNI.
The views and opinions of authors expressed within this notice shall not be used for advertising or product endorsement purposes. CPNI shall not accept responsibility for any errors or omissions contained within this advisory. In particular, they shall not be liable for any loss or damage whatsoever, arising from or in connection with the usage of information contained within this advisory.
CSIRTUK is a member of the Forum of Incident Response and Security Teams (FIRST) and has contacts with other international Incident Response Teams (IRTs) in order to foster cooperation and coordination in incident prevention, to prompt rapid reaction to incidents, and to promote information sharing amongst its members and the community at large.
Wed, 19 Dec 2007 14:10:00 GMT
Domain affected: Technical