Security Bulletin
Summary
A remote code execution vulnerability was addressed by IBM InfoSphere Information Server.
Vulnerability Details
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
Workarounds and Mitigations
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
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
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
Document Location
Worldwide
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Document Information
Modified date:
22 July 2020
UID
ibm16244664