Fix (APAR):  PI66849

Status:  Fix

Release:  8.5.5.9,8.5.5.8,8.5.5.7

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

Supersedes Fixes:  

CMVC Defect:  xxxxxx

Byte size of APAR:  10813543

Date: 2016-08-15

Abstract:  Multiple vulnerabilities associated with IBM HTTP Server.

Description/symptom of problem:  
PI66849 resolves the following problems:

ERROR DESCRIPTION:
The "expat" XML parsing library bundled with IHS has several input-related vulnerabilities, and the HTTPOXY vulnerability also affects IHS.  This PI66849 interim fix also includes fixes for PI63098 and PI65855.

LOCAL FIX:                                                      

PROBLEM SUMMARY:
The IHS related vulnerabilities resolved by this interim fix are:

CVEID: CVE-2012-0876                                           
DESCRIPTION: Expat is vulnerable to a denial of service,       
caused by insufficient randomization of hash data structures.  

CVEID: CVE-2012-1148                                           
DESCRIPTION: Expat is vulnerable to a denial of service,       
caused by a memory leak in poolGrow when handling XML data.

CVEID: CVE-2016-4472                                           
DESCRIPTION: Expat XML parser is vulnerable to a denial of     
service, caused by the removal by compilers with certain       
optimization settings. 

CVEID: CVE-2016-0718                                           
DESCRIPTION: Expat XML parser is vulnerable to a denial of     
service, caused by an out-of-bounds read within XML parser. 

CVEID: CVE-2016-5387                                           
DESCRIPTION: Apache HTTP Server could allow a remote attacker  
to redirect HTTP traffic of CGI application, caused by the     
lack of protection of untrusted client data in the HTTP_PROXY  
environment variable. 

PROBLEM CONCLUSION:
The bundled expat library was updated with the latest fixes, and IHS was updated to not copy the particular request header into HTTP-prefixed environment variable to resolve httpoxy.

The PI66849 APAR is expected to be included in IHS fixpacks:                                                    
- 9.0.0.2                                                     
- 8.5.5.11                                                    
- 8.0.0.13                                                    
- 7.0.0.43                                                    
The PI63098 APAR is expected to be included in IHS fixpacks:
- 9.0.0.1
- 8.5.5.10
- 8.0.0.13                                          
- 7.0.0.43                                          
The PI65855 APAR is expected to be included in IHS fixpacks:                                                    
- 9.0.0.1                                                       
- 8.5.5.11                                                      
- 8.0.0.13                                                      
- 7.0.0.43


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: