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Security Bulletin: IBM Verify Gateway PAM components do not set restricted access permission for debug logs (CVE-2020-4405)

Security Bulletin


Summary

To debug the IBM Verify Gateway (IVG) PAM components, customers can add "trace-file" parameters in the PAM configuration so that .log files are written to the /tmp directory. These debug logs potentially contain sensitive information, and yet they default to world readable. They should have stricter access permissions. As of v1.0.1 of IVG for AIX PAM, and v1.0.2 of IVG for Linux PAM, the logs are no longer world readable.

Vulnerability Details

CVEID:   CVE-2020-4405
DESCRIPTION:   IBM Verify Gateway (IVG) could disclose potentially sensitive information to an authenticated user due to world readable log files.
CVSS Base score: 3.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/179484 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)
IBM Verify Gateway (IVG)PAM 1.0.0, 1.0.1

Remediation/Fixes

Log in to IBM X-Force Exchange / App Exchange and download and install the latest IBM Security Verify Gateway (renamed from IBM Verify Gateway) PAM components. Specifically:

Workarounds and Mitigations

Use the chmod command to restrict access to PAM's "trace-file" logs in the /tmp directory.

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References

Off

Acknowledgement

Jonathan Fitz-Gerald, John Zuccato, Rodney Ryan, Chris Shepherd, Nathan Roane, Kamil Sarbinowski, Vince Dragnea, Troy Fisher and Elaheh Samani from IBM X-Force Ethical Hacking Team.

Change History

15 Jul 2020: 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.

Document Location

Worldwide

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Document Information

Modified date:
23 July 2020

UID

ibm16252479