Security Bulletin
Summary
The IBM Verify Gateway (IVG) components do not prevent rapid, excessive attempts to authenticate with a time-based one-time password (TOTP). Consequently, an attacker could brute force account credentials. 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, a throttling mechanism has been added to remediate this vulnerability.
Vulnerability Details
CVEID: CVE-2020-4400
DESCRIPTION: IBM Verify Gateway (IVG) uses an inadequate account lockout setting that could allow a remote attacker to brute force account credentials.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/179478 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/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) | 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 |
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) components. Specifically:
- IBM Security Verify Gateway for AIX PAM (Pluggable Authentication Modules) v1.0.1 at https://exchange.xforce.ibmcloud.com/hub/extension/e506cf66c5f51340cef3e1b40e8b4840
- IBM Security Verify Gateway for Linux PAM (Pluggable Authentication Modules) v1.0.2 at https://exchange.xforce.ibmcloud.com/hub/extension/80eca9a1094b416db69dfff40eb10c5a
- IBM Security Verify Gateway for RADIUS v1.0.1 at https://exchange.xforce.ibmcloud.com/hub/extension/d39efc0e03582d3eed3263d7e7022058
- IBM Security Verify Gateway for Windows Login v1.0.2 at https://exchange.xforce.ibmcloud.com/hub/extension/103b558c1aa73755641fe45493db3301
Workarounds and Mitigations
None
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References
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
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
Document Location
Worldwide
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Document Information
Modified date:
09 March 2021
UID
ibm16251279