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Security Bulletin: IBM InfoSphere Information Server is affected by a remote code execution vulnerability

Security Bulletin


Summary

A remote code execution vulnerability was addressed by IBM InfoSphere Information Server.

Vulnerability Details

CVEID:   CVE-2020-4305
DESCRIPTION:   IBM InfoSphere Information Server could allow a remote attacker to execute arbitrary code on the system, caused by the deserialization of untrusted data. By persuading a victim to visit a specially crafted Web site, an attacker could exploit this vulnerability to execute arbitrary code on the system.
CVSS Base score: 8.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/176677 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s) Version(s)
InfoSphere Information Server, Information Server on Cloud 11.7.1.1 and earlier 11.7 releases
InfoSphere Information Server, Information Server on Cloud 11.5
InfoSphere Information Server 11.3

Remediation/Fixes

None

Workarounds and Mitigations

Installations using WebSphere Application Server Network Deployment
 

1. Change directory to <WAS Install location>/AppServer/profiles/<profile name>/config/cells/<cell name>/applications/isf-servlets.ear/deployments/isf-servlets/isf-servlets.war/WEB-INF
     The default profile name is InfoSphere.

2. Open the web.xml file in an editor.
3. Within the security-constraint section
     a. Locate lines that match the following url-pattern

               <url-pattern>/javahttp/checked/*</url-pattern>
     b. Remove /checked to change the line to 
               <url-pattern>/javahttp/*</url-pattern>
4. Add a new security-constraint after the existing security constraints:
     <security-constraint>
           <web-resource-collection>
                <web-resource-name>Public</web-resource-name>
                <description>No Authorization resources</description>
                <url-pattern>/javahttp/unchecked/*</url-pattern>
           </web-resource-collection>
      </security-constraint>

5. Save the updated file.
6. Restart WAS.

Note: If you have a clustered environment, you can:
                  a. repeat the same steps for the deployment manager and all members of the cluster   --or--
                  b. perform the steps on the deployment manager and run SyncNode (so web.xml on the nodes is updated)
           After all are updated, restart the deployment manager and the cluster.

Installations using WebSphere Application Server Liberty

1. Change directory to <Liberty install location>/wlp/usr/servers/iis/apps/isf
2. Extract isf-servlets.war using following command:
          unzip isf-servlets.war
3. Open the isf-servlets/WEB-INF/web.xml file in an editor
4. Within the security-constraint section
     a. Locate lines that match the following url-pattern
               <url-pattern>/javahttp/checked/*</url-pattern>
     b. Remove /checked to change the line to 
               <url-pattern>/javahttp/*</url-pattern>
5. Add a new security-constraint after the existing security constraints:
     <security-constraint>
           <web-resource-collection>
                 <web-resource-name>Public</web-resource-name>
                 <description>No Authorization resources</description>
                 <url-pattern>/javahttp/unchecked/*</url-pattern>
           </web-resource-collection>
      </security-constraint>
6. Save the updated file.
7. Repackage the war file:
         a. Move the isf-servlets.war file to a backup location.

         b. Create the new isf-servlets.war file
                zip -r isf-servlets.war isf-servlets/
         c. Verify that the new isf-servlets.war file is created in <Liberty install location>/wlp/usr/servers/iis/apps/isf
8. Remove the isf-servlets folder.
9. Restart Liberty WebSphere.

Get Notified about Future Security Bulletins

References

Off

Acknowledgement

The vulnerability was reported to IBM by Lukasz Plonka and Maciej Grabiec

Change History

08 July 2020: Initial Publication
22 July 2020: Clarified location of new security-constraint, additional details for WAS ND clustered installations, corrected location of web.xml

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

Document Location

Worldwide

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Document Information

Modified date:
22 July 2020

UID

ibm16244664