Security Bulletin: IBM Verify Gateway does not prevent excessive authentication attempts (CVE-2020-4400)

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

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&gt;
• IBM Security Verify Gateway for Linux PAM (Pluggable Authentication Modules) v1.0.2 at <https://exchange.xforce.ibmcloud.com/hub/extension/80eca9a1094b416db69dfff40eb10c5a&gt;
• IBM Security Verify Gateway for RADIUS v1.0.1 at <https://exchange.xforce.ibmcloud.com/hub/extension/d39efc0e03582d3eed3263d7e7022058&gt;
• IBM Security Verify Gateway for Windows Login v1.0.2 at <https://exchange.xforce.ibmcloud.com/hub/extension/103b558c1aa73755641fe45493db3301&gt;

Workarounds and Mitigations

None