Fix (APAR):  PI45266

Status:  Fix

Release:  8.5.5.4

Operating System:  AIX,HP-UX,IBM i,Inspur K-UX,Linux,Solaris,Windows,z/OS

Supersedes Fixes:  

CMVC Defect:  xxxxxx

Byte size of APAR:  322133

Date: 2016-03-07

Abstract:  The HTTP Channel allows response splitting.

Description/symptom of problem:  

PI45266 resolves the following problem:

ERROR DESCRIPTION:
WebSphere Application Server could allow an HTTP response splitting attack.

LOCAL FIX:                                                      
N/A                                                             

PROBLEM SUMMARY:
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.

PROBLEM CONCLUSION:
An update was made to prevent the vulnerability.
The fix for this APAR is currently targeted for inclusion in fix packs
7.0.0.39, 8.0.0.12 and 8.5.5.8.




Directions to apply fix:  Fix applies to Editions:
Release 8.5
_X Application Server (Express or BASE)
_X Network Deployment (ND)
__ Liberty Core
_X Edge Components
_X Developer

Install Fix to all WebSphere installations unless special instructions are included below.

Special Instructions: None

NOTE:
The user must:
* Logged in with the same authority level when unpacking a fix, fix pack or refresh pack.
* Be at V1.4.3 or newer of the Installation Manager. Certain iFixes may require a newer version of the Installation Manager and the Installation Manager will inform you during the installation process if a newer version is required.

The IBM Knowledge Center can provide details, if needed, on the use of the Installation Manager to apply the iFixes.
http://publib.boulder.ibm.com/infocenter/install/v1r4/index.jsp.  Shutdown WebSphere Application Server before applying the iFixes.  Restart WebSphere Application Server after applying the iFixes.



Directions to remove fix:  

The IBM Knowledge Center can provide details, if needed, on the use of the Installation Manager to remove the iFixes.
http://publib.boulder.ibm.com/infocenter/install/v1r4/index.jsp.  Shutdown WebSphere Application Server before removing the iFixes.  Restart WebSphere Application Server after removing the iFixes.



Directions to re-apply fix:  
1) Shutdown WebSphere Application Server.

2) Follow the Fix instructions to apply the fix.

3) Restart WebSphere Application Server.





Additional Information: