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.
DESCRIPTION: 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 https://exchange.xforce.ibmcloud.com/vulnerabilities/129578 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 V126.96.36.199 through 188.8.131.52:
- Upgrade to 184.108.40.206 fix pack level then apply Interim Fix PI82587
- Upgrade to 220.127.116.11 fix pack level then apply Interim Fix PI82587
- Apply Fix Pack 5 (18.104.22.168), or later.
For V22.214.171.124 through 126.96.36.199:
- Upgrade to 188.8.131.52 fix pack level then apply Interim Fix PI82587
- Upgrade to 184.108.40.206 fix pack level then apply Interim Fix PI82587
- Apply Fix Pack 13 (220.127.116.11), or later.
For V18.104.22.168 through 22.214.171.124:
- Apply Fix Pack 14 (126.96.36.199), or later.
For V188.8.131.52 through 184.108.40.206:
- Upgrade to a minimum of 220.127.116.11 fix pack level then apply Interim Fix PI82587
- Apply Fix Pack 45 (18.104.22.168), or later.
Get Notified about Future Security Bulletins
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.
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.
15 June 2018