Fix (APAR):  PI42928

Status:  Fix

Release:  8.0.0.11

Operating System:  AIX,HP-UX,Linux,Solaris,Windows,z/OS

Supersedes Fixes:  

CMVC Defect:  xxxxxx

Byte size of APAR:  5064526

Date: 2015-08-31

Abstract:  CVE-2015-3183 for IBM HTTP Server

Description/symptom of problem:  
PI42928 resolves the following problem:

ERROR DESCRIPTION:
An attacker sending a carefully crafted request to IBM HTTP 
Server could force intermediate caches to cache the wrong
responses.                                                    

LOCAL FIX:                                                      

PROBLEM SUMMARY:
IBM HTTP Server is vulnerable to HTTP request smuggling, 
caused by a chunk header parsing flaw.  A malicious attacker 
could cause intermediate caches to cache and send the wrong 
response for a given URL, bypass web application firewall 
protection, and possibly conduct XSS attacks.

PROBLEM CONCLUSION:
Mishandled chunked requests are now correctly handled. 
                                                               
This fix is targeted for IBM HTTP Server fix packs: 
- 7.0.0.39 
- 8.0.0.12 
- 8.5.5.7 


Directions to apply fix:  
Special Instructions: None

NOTE: The user must:
* 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  a newer version of the Installation Manager and the Installation Manager will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.
* Be logged in with the same authority level when unpacking a fix, fix pack, or
  refresh pack.

The IBM Knowledge Center can provide details, if needed, on the use of the
Installation Manager to apply the interim fix:
http://publib.boulder.ibm.com/infocenter/install/v1r4/index.jsp.

1) Shutdown IBM HTTP Server
2) Apply the interim fix using Installation Manager
3) Restart IBM HTTP Server


Directions to remove fix:  
The IBM Knowledge Center can provide details, if needed, on the use of the
Installation Manager to remove the interim fix:
http://publib.boulder.ibm.com/infocenter/install/v1r4/index.jsp.

1) Shutdown IBM HTTP Server
2) Remove the interim fix using Installation Manager
3) Restart IBM HTTP Server


Directions to re-apply fix:  
1) Stop IBM HTTP Server.
2) Follow the directions to apply the fix.
3) Restart IBM HTTP Server.


Additional Information: