ESB-2017.1789 - [Win][Linux][IBM i][HP-UX][Solaris][AIX] IBM WebSphere Application Server: Access confidential data - Existing account 2017-07-21

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1789
          Security Bulletin: Information disclosure in WebSphere
                    Application Server (CVE-2017-1381)
                               21 July 2017

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

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

Product:           IBM WebSphere Application Server
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   IBM i
                   Solaris
                   Linux variants
                   Windows
                   z/OS
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-1381  

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=swg22004792

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

Security Bulletin: Information disclosure in WebSphere Application Server
(CVE-2017-1381)

Security Bulletin

Document information

More support for:

WebSphere Application Server

Software version:

7.0, 8.0, 8.5, 9.0

Operating system(s):

AIX, HP-UX, IBM i, Linux, Solaris, Windows, z/OS

Software edition:

Base, Developer, Enterprise, Express, Network Deployment

Reference #:

2004792

Modified date:

18 July 2017

Summary

There is an information disclosure in the WebSphere Application Server Proxy
Server or On-Demand-Router (ODR). This only occurs when the system clock is
changed. If the system clock is changed it could cause stale data to be
cached and served.

Vulnerability Details

CVEID:

CVE-2017-1381

DESCRIPTION:

IBM WebSphere Application Server Proxy Server or On-demand-router (ODR) could
allow a local attacker to obtain sensitive information, caused by stale data
being cached and then served.

CVSS Base Score: 2.9

CVSS Temporal Score: See

https://exchange.xforce.ibmcloud.com/vulnerabilities/127152

for the current score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)

Affected Products and Versions

This vulnerability affects the following versions and releases of IBM
WebSphere Application Server:

Version 9.0 - you are only affected if you have changed the default value for
the custom property cache.query.string to false

Version 8.5

Version 8.0

Version 7.0

Remediation/Fixes

This vulnerability only occurs if you change the system clock.

The recommended solution is to apply the interim fix, Fix Pack or PTF
containing APAR PI82630 for each named product as soon as practical.

For traditional WebSphere Application Server and WebSphere Application Server
Hypervisor Edition:

For V9.0.0.0 through 9.0.0.4:

 Upgrade to minimal fix pack levels as required by interim fix and then apply
Interim Fix

PI82630

- --OR--

 Apply Fix Pack 9.0.0.5 or later (targeted availability 29 September 2017).

For V8.5.0.0 through 8.5.5.12 Full Profile:

 Upgrade to minimal fix pack levels as required by interim fix and then apply
Interim Fix

PI82630

- --OR--

 Apply Fix Pack 8.5.5.13 or later (targeted availability 5 February 2018).

For V8.0.0.0 through 8.0.0.13:

 Upgrade to a minimal fix pack levels as required by interim fix and then
apply Interim Fix

PI82630

- --OR--

 Apply Fix Pack 8.0.0.14 or later (targeted availability 16 October 2017).

For V7.0.0.0 through 7.0.0.43:

 Upgrade to a minimal fix pack levels as required by interim fix and then
apply Interim Fix

PI82630

- --OR--

 Apply Fix Pack 7.0.0.45 or later (targeted availability 2Q 2018).

Workarounds and Mitigations

There are several ways to work around this issue. You only need to do one
of these or apply the Interim fix above.

1) Restart the ODR or proxy server after changing the system clock.

2) If your applications do not require response caching then disable caching
and restart the ODR or proxy server prior to changing the system clock.

https://www.ibm.com/support/knowledgecenter/SSAW57_8.5.5/com.ibm.websphere.nd.doc/ae/ujpx_proxy.html

3) Set the custom property cache.query.string to true and restart the ODR or
proxy server prior to changing the system clock. This is already set to true
in Version 9.

https://www.ibm.com/support/knowledgecenter/SSAW57_8.5.5/com.ibm.websphere.nd.doc/ae/rjpx_siphttpcustprops.html#cache.query.string

4) Clear the ODR or proxy server cache prior to changing the system clock.

https://developer.ibm.com/answers/questions/382562/how-do-i-clear-the-
websphere-proxy-server-or-odr-c.html

5) In the application, set the "Cache-Control: no-cache" directive header in
the response to prevent sensitive content from being cached in the proxy
server or ODR.

Get Notified about Future Security Bulletins

Subscribe to My Notifications to be notified of important product support
alerts like this.

Important note

IBM strongly suggests that all System z customers be subscribed to the System
z Security Portal to receive the latest critical System z security and
integrity service. If you are not subscribed, see the instructions on the
System z Security web site . Security and integrity APARs and associated
fixes will be posted to this portal. IBM suggests reviewing the CVSS scores
and applying all security or integrity fixes as soon as possible to minimize
any potential risk.


References

Complete CVSS v3 Guide

On-line Calculator v3



Related information

IBM Secure Engineering Web Portal

IBM Product Security Incident Response Blog



Change History

18 July 2017: original document published

*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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