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ESB-2014.0679 - [Win][UNIX/Linux][Appliance] IBM Security Access Manager: Denial of service - Remote/unauthenticated

Date: 07 May 2014
References: ESB-2014.0714  ESB-2014.0764  ESB-2014.0782  ESB-2014.0783  ESB-2014.0815  ESB-2014.0819  ESB-2014.0821  ESB-2014.0838  ESB-2014.0878  ESB-2014.0880  
ESB-2014.0983  

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.0679
        Security Bulletin: IBM Security Access Manager for Web High
                      CPU utilization (CVE-2014-0963)
                                7 May 2014

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM Security Access Manager
Publisher:         IBM
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
                   Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-0963  

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21672192

- --------------------------BEGIN INCLUDED TEXT--------------------

Security Bulletin: IBM Security Access Manager for Web High CPU utilization
(CVE-2014-0963)

Security Bulletin

Document information

More support for:
IBM Security Access Manager for Web

Software version:
7.0, 8.0

Operating system(s):
All Platforms

Reference #:
1672192

Modified date:
2014-05-06

Summary

The Reverse Proxy component in all versions of IBM Security Access Manager
for Web is affected by a problem in which, under very specific conditions,
CPU utilization can rapidly increase and not decrease. This issue is related
to the SSL implementation in IBM Security Access Manager (ISAM) for Web.

Vulnerability Details

CVE ID:
CVE-2014-0963

DESCRIPTION:
The Reverse Proxy component in all versions of IBM Security Access
Manager for Web is affected by a problem with the handling of certain SSL
messages. The TLS implementation in a component of the Reverse Proxy can,
under very specific conditions, cause CPU utilization to rapidly increase
and not decrease. The situation occurs only in a certain error case that
causes a single thread to begin looping. If this happens multiple times,
more threads will begin to loop and an increase in CPU utilization will be
seen. This could ultimately result in CPU exhaustion and unresponsiveness
of IBM Security Access Manager for Web and other software running on the
affected system.

This issue can affect the availability of the system, but does not impact
system confidentiality or integrity. This vulnerability can be remotely
exploited, authentication is not required and the exploit is moderately
complex.

To determine if your systems are being affected by this issue, you can
monitor the CPU utilization of your ISAM for Web instances.

CVSS:
CVSS Base Score: 7.1
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/92844 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:C)

Affected Products and Versions

All versions of IBM Security Access Manager for Web, both software and
appliance: 7.0, 8.0

Remediation/Fixes

IBM has provided patches for all affected versions. Follow the installation
instructions in the README files included with the patch.

Affected Version	Build	APAR	Download URL
ISAM for Web 7.0	7006	IV59660	7.0.0-ISS-SAM-IF0006
ISAM for Web 8.0	80032	IV59660	8.0.0.3-ISS-WGA-IF0002

Workarounds and Mitigations

Methods for ISAM for Web 7.0 software version

Method One: Monitor CPU utilization of your WebSEAL instances. If utilization
becomes abnormally high, stop and restart the affected instance.

Method Two: Enable SSLv3 and disable all versions of TLS used by WebSEAL. To
do this, perform these steps for every WebSEAL instance in your environment:

	In the [ssl] stanza of the WebSEAL instance configuration file,
	enable SSLv3 by setting the following parameter:

	disable-ssl-v3 = no
	In the [ssl] stanza of the WebSEAL instance configuration file,
	disable all versions of TLS by setting every parameter that starts
	with "disable-tls" to "yes"
	Restart the WebSEAL instance

Methods for all ISAM for Web appliance versions

Method One: Monitor CPU utilization of your ISAM for Web appliance. From
the Monitor main menu item, select System Graphs | CPU. If utilization
becomes abnormally high, stop and restart all Reverse Proxy instances.

Method Two: Enable SSLv3 and disable all versions of TLS used by each
Reverse Proxy instance. To do this, perform these steps for every Reverse
Proxy instance in your environment:

    In the [ssl] stanza of the Reverse Proxy instance configuration file,
    enable SSLv3 by setting the following parameter:

    disable-ssl-v3 = no
    In the [ssl] stanza of the Reverse Proxy configuration file, disable
    all versions of TLS by setting every parameter that starts with
    "disable-tls" to "yes"
    Save your changes and deploy.

References

Complete CVSS Guide
On-line Calculator V2
CVE-2014-0963 http://xforce.iss.net/xforce/xfdb/92844

Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

*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 Security Bulletin.

Disclaimer

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.

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
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===========================================================================
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