CVE-2020-4427

What is IBM Data Risk Manager?

IBM Data Risk Manager (IDRM) is an enterprise security and risk management platform that aggregates vulnerability data from IBM's AppScan, QRadar, and Guardium products to provide a unified view of an organization's security posture. It is deployed on-premises in large enterprises and government agencies to help security teams prioritize remediation. Because IDRM aggregates sensitive vulnerability and data classification information across an organization's entire security toolset, compromising it gives attackers a detailed map of the target's security weaknesses.

Overview

CVE-2020-4427 is an authentication bypass vulnerability in IBM Data Risk Manager that allows an unauthenticated remote attacker to gain full administrative access to the IDRM web interface. It is one of four vulnerabilities (CVE-2020-4427 through CVE-2020-4430) discovered by Pedro Ribeiro of Agile Information Security in April 2020. The disclosure process was notable: IBM initially refused to patch the vulnerabilities, claiming they were out of scope — researchers published anyway after IBM's response, ultimately forcing IBM to release a patch.

CVE-2020-4427 is typically chained with CVE-2020-4428 (OS command injection) for a complete unauthenticated remote code execution exploit chain.

Affected Versions

Technical Details

IBM IDRM's web application uses a session management mechanism with predictable or improperly secured tokens when SAML authentication is configured. The bypass allows an attacker to craft a request that the application accepts as an authenticated admin session without providing valid credentials.

The practical exploit chain discovered by Ribeiro:

1. CVE-2020-4427 (this CVE): bypass authentication to obtain an admin session or access admin-only API endpoints
2. CVE-2020-4428: once authenticated (or using the bypass), inject OS commands via an administrative function to achieve RCE as root
3. CVE-2020-4429: hardcoded default credentials (a3user / idrm) enable admin access on fresh deployments where defaults are not changed
4. CVE-2020-4430: path traversal allows downloading arbitrary files from the IDRM server

Discovery

Pedro Ribeiro of Agile Information Security discovered all four vulnerabilities in April 2020. His initial disclosure to IBM on April 21, 2020 was declined — IBM stated the vulnerabilities were out of scope for their bug bounty program. After CERT/CC intervention, IBM eventually agreed to patch and released a fix in IDRM v2.0.6.1 on May 7, 2020. The public disclosure and IBM's initial refusal to patch drew widespread attention to the vulnerability's severity.

Exploitation Context

CISA added CVE-2020-4427 to the KEV catalog on November 3, 2021 as part of the initial KEV launch, indicating confirmed exploitation in the wild. IBM IDRM is deployed in enterprise and government environments where it aggregates sensitive security data — making it a high-value target for attackers seeking intelligence about an organization's security posture before launching broader attacks.

Remediation

1. Upgrade to IDRM v2.0.6.1 or later: Apply the IBM patch via the normal IDRM update mechanism.
2. Change default credentials: If running a fresh deployment, change the default a3user/idrm credentials immediately (addresses CVE-2020-4429).
3. Restrict network access: IDRM should not be internet-accessible — restrict to internal management networks only.
4. Review admin audit logs: Check for unauthorized access events or configuration changes in the IDRM audit trail around the exposure window.