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Security Bulletin: WebSphere Application Server Edge Caching Proxy may be vulnerable to HTTP response splitting (CVE-2017-1503)

Security Bulletin


The Edge Caching Proxy component of WebSphere Application Server may be vulnerable to HTTP response splitting attack. This is a separate install from WebSphere Application Server. You only need to apply this if you use the Edge Caching Proxy.

Vulnerability Details

CVEID: CVE-2017-1503
IBM WebSphere Application Server is vulnerable to HTTP response splitting attacks. A remote attacker could exploit this vulnerability using specially-crafted URL to cause the server to return a split response, once the URL is clicked. This would allow the attacker to perform further attacks, such as Web cache poisoning, cross-site scripting, and possibly obtain sensitive information.
CVSS Base Score: 6.1
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)

Affected Products and Versions

This vulnerability affects the Edge Caching Proxy (separate install) shipped with the following versions and releases of IBM WebSphere Application Server:

  • Version 9.0
  • Version 8.5
  • Version 8.0
  • Version 7.0


The recommended solution is to apply the Fix Pack or PTF for each named product as soon as practical.


Apply an Interim Fix, Fix Pack or PTF containing APAR PI82587 if you use the Edge Caching Proxy component (separate install from WebSphere Application Server) as noted below:

For IBM WebSphere Application Server

For V9.0.0.0 through

  • Upgrade to fix pack level then apply Interim Fix PI82587
-- OR
  • Upgrade to fix pack level then apply Interim Fix PI82587
-- OR
  • Apply Fix Pack 5 (, or later.
For V8.5.0.0 through
  • Upgrade to fix pack level then apply Interim Fix PI82587
-- OR
  • Upgrade to fix pack level then apply Interim Fix PI82587
-- OR
  • Apply Fix Pack 13 (, or later.
For V8.0.0.0 through
  • Apply Fix Pack 14 (, or later.

For V7.0.0.0 through
  • Upgrade to a minimum of fix pack level then apply Interim Fix PI82587
-- OR
  • Apply Fix Pack 45 (, or later.

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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.



Change History

09 October 2017: original document published
31 October 2017: corrected version 8
07 November 2017: added separate install information

*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.


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.

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Document Information

Modified date:
15 June 2018