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IBM SECURITY ADVISORY

First Issued: Thu Dec 8 12:46:23 CST 2011

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/invscout_advisory2.asc
===============================================================================
VULNERABILITY SUMMARY

VULNERABILITY: AIX inventory scout file deletion and symlink vulnerability

PLATFORMS: AIX 5.3, 6.1, and 7.1, and earlier releases

SOLUTION: Apply the fix described below.

THREAT: See below.

CVE Number: CVE-2011-1384

Reboot required? NO
Workarounds? YES
Protected by FPM? NO
Protected by SED? NO
===============================================================================
DETAILED INFORMATION

I. DESCRIPTION

A vulnerability exists in the inventory scout code which may allow a user
to delete vital system files and allow an attacker to cause the software
to operate on unauthorized files.

II. CVSS

CVSS Base Score: 6.3
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/71615 for the
current score
CVSS Environmental Score*: Undefined

III. PLATFORM VULNERABILITY ASSESSMENT

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

# lslpp -l | grep invscout.rte

The following filesets are vulnerable:

AIX 7.1, 6.1, 5.3: all versions less than 2.2.0.19

NOTE: The invscout.rte is based on an independent service release and is
not tied to any particular version or release of AIX.

IV. SOLUTIONS

A. APARS

IBM has assigned the following APARs to this problem:

AIX Level APAR number Availability
---------------------------------------------------
5.3 IV11643 available
6.1 IV11643 available
7.1 IV11643 available

Subscribe to the APARs here:

http://www.ibm.com/support/docview.wss?uid=isg1IV11643

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. FIX

IMPORTANT: If possible, it is recommended that a mksysb backup
of the system be created. Verify it is both bootable and
readable before proceeding.

To preview a fix installation:

installp -a -d fix_name -p all # where fix_name is the name of the
# fix package being previewed.
To install a fix package:

installp -a -d fix_name -X all # where fix_name is the name of the
# fix package being installed.

Interim fixes have had limited functional and regression
testing but not the full regression testing that takes place
for Service Packs; thus, IBM does not warrant the fully
correct functionality of an interim fix.

V. WORKAROUNDS

a) Remove the setuid bit from the following:

chmod 555 /opt/IBMinvscout/bin/invscoutClient_VPD_Survey
chmod 555 /opt/IBMinvscout/sbin/invscout_lsvpd

     NOTE: chmod will disable functionality of these commands for
all users except root.

VII. CONTACT INFORMATION

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

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

and click on the "My notifications" link.

To view previously issued advisories, 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.

VIII. ACKNOWLEDGMENTS

This vulnerability was reported by Jakub Wartak.

IX. 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/71615
CVE-2011-1384: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1384

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