## Summary

An information disclosure vulnerability in Kubernetes used by IBM InfoSphere Information Server was addressed.

## Vulnerability Details

** CVEID: **[CVE-2021-25740]()
** DESCRIPTION: **Kubernetes could allow a remote authenticated attacker to obtain sensitive information, caused by a confused deputy attack. By sending a specially-crafted request to create or edit Endpoints or EndpointSlices in the Kubernetes API, an attacker could exploit this vulnerability to obtain backend IPs information, and use this information to launch further attacks against the affected system.
CVSS Base score: 3.1
CVSS Temporal Score: See: [ https://exchange.xforce.ibmcloud.com/vulnerabilities/205570]() for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N)

## Affected Products and Versions

Affected Product(s)| Version(s)
—|—
InfoSphere Information Server,
Information Server on Cloud| 11.7

Note: New suite installations of Information Server 11.7.1.4 are not vulnerable but installations upgraded to 11.7.1.4 may be vulnerable.

## Remediation/Fixes

None

## Workarounds and Mitigations

You can check whether your installation is affected by running the following command:

` $ if kubectl get clusterrole system:aggregate-to-edit -oyaml | grep -q endpoints; then echo ‘Affected’; else echo ‘Not affected’; fi`

Run the following commands to apply the fix:

$ kubectl get clusterrole system:aggregate-to-edit -oyaml > /tmp/aggregate-to-edit-role.bak

$ sed ‘/endpoints/d’ /tmp/aggregate-to-edit-role.bak | kubectl replace -f –

The commands need only be applied once; the effect is not affected when subsequent patches are installed.

` `

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### References

[Complete CVSS v3 Guide]( “Link resides outside of ibm.com” )
[On-line Calculator v3]( “Link resides outside of ibm.com” )

Off

## Related Information

[IBM Secure Engineering Web Portal]()
[IBM Product Security Incident Response Blog]()

## Change History

03 Jan 2023: Initial Publication

*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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. “Affected Products and Versions” referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

## Document Location

Worldwide

[{“Business Unit”:{“code”:”BU059″,”label”:”IBM Software w/o TPS”},”Product”:{“code”:”SSZJPZ”,”label”:”IBM InfoSphere Information Server”},”Component”:””,”Platform”:[{“code”:”PF002″,”label”:”AIX”},{“code”:”PF033″,”label”:”Windows”},{“code”:”PF016″,”label”:”Linux”}],”Version”:”11.7″,”Edition”:””,”Line of Business”:{“code”:”LOB10″,”label”:”Data and AI”}}]Read More