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Security Bulletin: HTTP response splitting attack in WebSphere Application Server (CVE-2015-2017)

Security Bulletin


Summary

There is a vulnerability in IBM WebSphere Application Server that could allow an HTTP response splitting attack in Channel.

Vulnerability Details

CVEID: CVE-2015-2017
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: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/103991 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:P/A:N)

Affected Products and Versions

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

  • Version 8.5.5 Full Profile and Liberty Profile
  • Version 8.5 Full Profile and Liberty Profile
  • Version 8.0
  • Version 7.0
  • Version 6.1

Remediation/Fixes

The recommended solutions is to apply the interim fix, Fix Pack or PTF containing APAR PI45266 for each named product as soon as practical.

For WebSphere Application Server:

For V8.5.0.0 through 8.5.5.7 Full Profile:

· Upgrade to a minimal fix pack level as required by interim fix and then apply Interim Fix PI45266
(Note: If you downloaded the interim fix for WebSphere Application Server Full Profile 8.5.5.7 on or before November 17, 2015, please uninstall it and install the new 8.5.5.7 interim fix for PI45266. The previous interim fix also contained the fix for another APAR and it was enabled by default).

--OR--
· Apply Fix Pack 8.5.5.8 or later (targeted availability 11 December 2015).

For V8.5.0.0 through 8.5.5.7 Liberty Profile:
· Upgrade to a minimal fix pack level as required by interim fix and then apply Interim Fix PI45266

--OR--
· Apply Fix Pack 8.5.5.8 or later (targeted availability 11 December 2015).


For V8.0 through 8.0.0.11:

· Upgrade to a minimal fix pack level as required by interim fix and then apply Interim Fix PI45266

--OR--
· Apply Fix Pack 8.0.0.12 or later (targeted availability 02 February 2016).


For V7.0.0.0 through 7.0.0.37:

· Upgrade to a minimal fix pack level as required by interim fix and then apply Interim Fix PI45266

--OR--
· Apply Fix Pack 7.0.0.39 or later (targeted availability 02 November 2015).

For V6.1.0.0 through 6.1.0.47:
· Upgrade to Fix Pack 6.1.0.47 and then apply Interim Fix PI45266


For unsupported versions IBM recommends upgrading to a fixed, supported version of the product.

Workarounds and Mitigations

none

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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.

References

Complete CVSS v2 Guide
On-line Calculator v2

Related information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

29 October 2015: original document published
30 October 2015: clarified product infomation
2 November 2015: Fixed minor grammatical error
19 November 2015: updated with new interim fix

*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.

Cross reference information
Segment Product Component Platform Version Edition
Application Servers WebSphere Application Server Hypervisor Edition
Application Servers WebSphere Application Server Liberty Core

Document information

More support for: WebSphere Application Server
General

Software version: 6.1, 7.0, 8.0, 8.5, 8.5.5

Operating system(s): AIX, HP-UX, IBM i, Linux, Solaris, Windows, z/OS

Software edition: Base, Developer, Express, Liberty, Network Deployment

Reference #: 1966837

Modified date: 07 October 2016