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Security Bulletin: IBM Verify Gateway does not sufficiently guard against unauthorized API calls (CVE-2020-4847)

Security Bulletin


When the IBM Verify Gateway (IVG) components make API calls, there is insufficient protection of tenant secrets. It's possible for an attacker to obtain the access token belonging to another tenant and issue an API while impersonating that tenant. As of v1.0.1 of IVG for RADIUS and IVG for AIX PAM, and v1.0.2 of IVG for Linux PAM and IVG for Windows Login, the client API secrets, access tokens, and cookies are scrubbed so that they cannot be captured for replay in another API call.

Vulnerability Details

CVEID:   CVE-2020-4847
CVSS Base score: 7.1
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N)

Affected Products and Versions

Affected Product(s)Version(s)
IBM Verify Gateway (IVG)RADIUS 1.0.0
IBM Verify Gateway (IVG)PAM 1.0.0, 1.0.1
IBM Verify Gateway (IVG)WinLogin 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) components. Specifically:

Workarounds and Mitigations


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Jonathan Fitz-Gerald, John Zuccato, Rodney Ryan, Chris Shepherd, Nathan Roane, Kamil Sarbinowski, Vince Dragnea, Troy Fisher and Elaheh Samani

Change History

14 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


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Document Information

Modified date:
09 March 2021