07 May 2014
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== 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 22.214.171.124-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-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: email@example.com Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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