Fix (APAR):  PH25216

Status:  Fix

Release:  8.5.5.17,8.5.5.16,8.5.5.15,8.5.5.14,8.5.5.13,8.5.5.12,8.5.5.11,8.5.5.10,8.5.5.9,8.5.5.8,8.5.5.7,8.5.5.6,8.5.5.5,8.5.5.4,8.5.5.3,8.5.5.2,8.5.5.1,8.5.5

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

Supersedes Fixes:  PI22949:PI82522:PI91256:PH01352:PH11655:PH12773

CMVC Defect:  xxxxxx

Byte size of APAR:  886446

Date: 2020-05-13

Abstract:  IBM WebSphere Deserialization of Untrusted Data Remote Code Execution Vulnerability (CVE-2020-4448)

Description/symptom of problem:  
PH25216 resolves the following problem:

ERROR DESCRIPTION:
IBM WebSphere Deserialization of Untrusted Data Remote Code Execution Vulnerability (CVE-2020-4448)

LOCAL FIX:

PROBLEM SUMMARY:
IBM WebSphere Deserialization of Untrusted Data Remote Code Execution Vulnerability (CVE-2020-4448)

PROBLEM CONCLUSION:
IBM WebSphere Deserialization of Untrusted Data Remote Code Execution Vulnerability (CVE-2020-4448)


Directions to apply fix:  Fix applies to Editions:
Release 8.5
__ Application Server (Express or BASE)
_X_ Network Deployment (ND)
__ Liberty Core
__ Edge Components
__ 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 Certain iFixes may require a newer version of the Installation Manager and the Installation Manager will inform you during the installation process if a newer version is required.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: