CVE-2020-4675: Security Bulletin: 3RD PARTY IBM InfoSphere MDM Inspector

Summary

In the MDM Inspector web application, CSRF protection is implemented by validating that the referer header is set to a allowlisted domain. It is possible to include the allowlisted domain as a subdomain of an attacker-controlled domain to bypass this validation, allowing for a CSRF attack to be launched from the attacker-controlled domain. Example attacker-domain that would be accepted by an Inspector application hosted on example.internal: example.internal.attacker.com. As the validation is not performed on the entirety of the referer header, the application will accept example.internal.attacker.com as a valid referer, allowing for CSRF to be performed from this domain.

Vulnerability Details

CVEID: CVE-2020-4675
DESCRIPTION: IBM InfoSphere Master Data Management Server is vulnerable to cross-site request forgery which could allow an attacker to execute malicious and unauthorized actions transmitted from a user that the website trusts.
CVSS Base score: 6.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/186324 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)

Affected Products and Versions

Affected Product(s)

Version(s)

InfoSphere Master Data Management

11.6

Workarounds and Mitigations

Approach 1 : Client can avoid security(psirt) issue, by giving proper allowlist-param in web.xml. i.e. its ended by ‘/’
eg: instead of https://accounts.google.com ---->> https://accounts.google.com**/**

References

Off

Acknowledgement

The vulnerability was reported to IBM by Chris Kent on behalf of e-Secure Pty Ltd

Change History

18 May 2021: 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

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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