Fix (APAR): PH26083 Status: Fix Release: 9.0.5.4,9.0.5.3 Operating System: AIX,HP-UX,IBM i,Linux,Solaris,Windows,z/OS Supersedes Fixes: CMVC Defect: xxxxxx Byte size of APAR: 271298 Date: 2020-07-30 Abstract: WebSphere Application Server Code Execution Vulnerability by local users due to Improper Handling of UNC Paths (CVE-2020-4534 CVSS Score 7.8) Description/symptom of problem: PH26083 resolves the following problem: ERROR DESCRIPTION: WebSphere Application Server Code Execution Vulnerability by local users due to Improper Handling of UNC Paths (CVE-2020-4534 CVSS Score 7.8). LOCAL FIX: PROBLEM SUMMARY: WebSphere Application Server Code Execution Vulnerability by local users due to Improper Handling of UNC Paths (CVE-2020-4534 CVSS Score 7.8). PROBLEM CONCLUSION: WebSphere Application Server Code Execution Vulnerability by local users due to Improper Handling of UNC Paths (CVE-2020-4534 CVSS Score 7.8). Directions to apply fix: 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 V1.8.5 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 Certain iFixes may require a newer version of the Installation Manager and the Installation Manager will inform you during the installation process if a newer version is required.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 Information Center can provide details, if needed, on the use of the Installation Manager to apply the iFixes. http://www.ibm.com/support/knowledgecenter/SSDV2W_1.8.5/com.ibm.cic.agent.ui.doc/helpindex_imic.html. Shutdown WebSphere Application Server before applying the iFixes. Restart WebSphere Application Server after applying the iFixes. Directions to remove fix: The IBM Information Center can provide details, if needed, on the use of the Installation Manager to remove the iFixes. http://www.ibm.com/support/knowledgecenter/SSDV2W_1.8.5/com.ibm.cic.agent.ui.doc/helpindex_imic.html. 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: