IBM Support

Security Bulletin: Authd service in the IBM Verify Gateway PAM components is vulnerable to denial of service attack (CVE-2020-4399)

Security Bulletin


Summary

The IBM Verify Gateway (IVG) Authd service listens on TCP port 12. It's possible to mount a denial of service attack by sending malformed requests to port 12, thereby crashing the service. As of v1.0.1 of IVG for AIX PAM, and v1.0.2 of IVG for Linux PAM, the Authd service is not used. The PAM module now goes directly to the tenant using TLS encryption.

Vulnerability Details

CVEID:   CVE-2020-4399
DESCRIPTION:   IBM Verify Gateway (IVG) could allow an authenticated user to send malformed requests to cause a denial of service against the server.
CVSS Base score: 6.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/179476 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

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

None

Get Notified about Future Security Bulletins

Subscribe to My Notifications to be notified of important product support alerts like this.

References

Complete CVSS v3 Guide
On-line Calculator v3

Off

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

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

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.

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

[{"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

UID

ibm16251323

Page Feedback