Security Bulletin: Internal service types can be invoked in IBM Business Process Manager (BPM) and WebSphere Lombardi Edition (WLE) Process Portal (CVE-2015-0110)

Security Bulletin

Summary

When invoking a service using the executeServiceByName URL, there is no access restriction based on the service type and services that were meant for internal use only are available for authenticated users.

Vulnerability Details

CVEID: CVE-2015-0110

DESCRIPTION: IBM Business Process Manager are vulnerable to an authenticated remote attacker accessing services that were meant for internal use only.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/99630 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:S/C:N/I:P/A:N)

Affected Products and Versions

IBM Business Process Manager Standard V7.5.x, 8.0.x, 8.5.x
IBM Business Process Manager Express V7.5.x, 8.0.x, 8.5.x
IBM Business Process Manager Advanced V7.5.x, 8.0.x, 8.5.x
WebSphere Lombardi Edition 7.2.x

If you are using an earlier unsupported version, IBM strongly recommends to upgrade.

Remediation/Fixes

Install the interim fix for APAR JR52126 as appropriate for your current IBM Business Process Manager or IT06189 for your current WebSphere Lombardi Edition environment.

Before this fix, a user could start System Tasks or User Tasks that were not exposed to this user via undocumented URLs.
The new functionality is:
"With URLs it is possible,

to start Human Services that are exposed to the logged-on user
to start Ajax Services.

Execution of other service types is rejected, unless

the request arrives on the Process Center and
the request was issued by Process Designer in a playback session and
the user that issued this request is a member of the tw_authors group and
the user is granted Read access to the process app.

If this behaviour conflicts with existing solutions, it is possible to disable the new checks.
To do this, add
<server merge="mergeChildren">
<web-workflow-manager merge="mergeChildren">
<enforce-correct-service-type-for-execute-service-by-name>false</enforce-correct-service-type-for-execute-service-by-name>
</web-workflow-manager>
</server>

to 100Custom.xml

Workarounds and Mitigations

None

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Important Note

IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.

References

Complete CVSS v2 Guide
On-line Calculator v2

Off

Change History

2015-03-13 - initial version published

*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.

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Tips

Security Bulletin: Internal service types can be invoked in IBM Business Process Manager (BPM) and WebSphere Lombardi Edition (WLE) Process Portal (CVE-2015-0110)