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Security Bulletin: IBM Verify Gateway PAM components default to cleartext storage of client secret (CVE-2020-4369)

Security Bulletin


Summary

The IBM Verify Gateway (IVG) PAM components allow encryption of the client-secret property in the /etc/pam_ibm_auth.json file, but it's not the default configuration. Instead, customers must remember to add an --obfuscation command-line flag to encrypt the property. As of v1.0.1 of IVG for AIX PAM, and v1.0.2 of IVG for Linux PAM, the client-secret property is encrypted by default.

Vulnerability Details

CVEID:   CVE-2020-4369
DESCRIPTION:   IBM Verify Gateway (IVG) stores highly sensitive information in cleartext that could be obtained by a user.
CVSS Base score: 5.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/179004 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/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

Add the --obf command-line flag when running /opt/ibm/ibm_auth/ibm_authd in order to generate an encrypted version of the client secret. Then, store the encrypted version in /etc/pam_ibm_auth.json by using the "obf-client-secret" parameter. For details, see the IBM Knowledge Center topic at https://www.ibm.com/support/knowledgecenter/en/SSCT62/com.ibm.iamservice.doc/references/r_verify_pam_ibmauthapi.html.

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References

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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

13 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:
09 March 2021

UID

ibm16251285