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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


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: 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


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.

Get Notified about Future Security Bulletins




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.


Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Document Location


[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSCT62","label":"IBM Security Verify"},"Component":"IBM Verify Gateway for PAM","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF016","label":"Linux"}],"Version":"1.0.0, 1.0.1","Edition":"","Line of Business":{"code":"LOB24","label":"Security Software"}}]

Document Information

Modified date:
09 March 2021