How to Fix CVE-2020-4427: Bypass Security in Data Risk Manager

By the Sai Kiran Pandrala · Reviewed and edited by Sai Kiran Pandrala, Editor

⚠️ Remediate or isolate immediately. CVE-2020-4427 is in CISA's Known Exploited Vulnerabilities catalog (added 2021-11-03), and IBM Data Risk Manager is end-of-support with no clean patched version named for the affected 2.0.x line. Follow IBM Security Bulletin 6206875 and isolate the appliance until it is remediated or decommissioned.

What is CVE-2020-4427?

CVE-2020-4427 is an authentication bypass in IBM Data Risk Manager (IDRM), a data-security risk-management product shipped as a Linux-based virtual appliance (an OVA you import into VMware or another hypervisor). The flaw is classified as CWE-287, Improper Authentication. It affects IDRM versions 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, and 2.0.6, and it is tracked internally as IBM X-Force ID 180532.

The bug lives in the appliance's web console when it is configured with SAML authentication. By sending a specially crafted HTTP request to the IDRM API, a remote, unauthenticated attacker can defeat the SAML login flow entirely and obtain a valid administrative session. There is no password to guess and no brute-force step. The attacker simply asks the API for an authenticated session and the appliance hands one over.

This is an authentication bypass, not remote code execution on its own and not a denial-of-service condition. That distinction matters when you triage. By itself, CVE-2020-4427 gives an attacker full administrative control of the IDRM console. In the public research that disclosed this issue, however, it was chained with three sibling bugs in the same appliance — command injection (CVE-2020-4428), an insecure default password (CVE-2020-4429), and an arbitrary file download (CVE-2020-4430) — to escalate from “bypass the login” all the way to unauthenticated remote root on the appliance. Because IDRM is designed to inventory and connect to your most sensitive data stores, an attacker who owns the appliance can frequently pivot into the databases and systems it monitors.

The CVSS 3.0 base score is 9.0 (Critical), vector AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H. The high attack complexity (AC:H) reflects the precondition that SAML must be configured; the changed scope (S:C) and the high confidentiality, integrity, and availability impacts reflect that a successful bypass yields full admin over the appliance and the data it touches. CISA has confirmed exploitation in the wild and added it to the KEV catalog, so this is not a theoretical risk.

Am I affected?

You are affected if you run an IBM Data Risk Manager virtual appliance at any 2.0.x version from 2.0.1 through 2.0.6. There is no apt or rpm package to query here — IDRM is a self-contained appliance, so check the version inside the appliance, not on a host OS package manager.

• From the web console: sign in and open Administration → System Settings → About (or the equivalent “About / Version” panel). The build string identifies the 2.0.x release.
• From the appliance shell (SSH as the admin account): the release is recorded in the IDRM application files under the install root. Inspect the deployed application metadata rather than the OS:

# On the IDRM appliance shell: find the IDRM application version marker
# (path varies slightly by build; search the IDRM install tree)
sudo find / -iname 'version*.properties' -path '*idrm*' 2>/dev/null
sudo grep -ri 'version' /home/a3user 2>/dev/null | grep -i idrm | head

If SAML authentication is enabled on that appliance, treat it as actively exposed. Even if SAML is not currently configured, plan to remediate, because the appliance is end-of-support and carries the three chained companion CVEs regardless.

How to fix CVE-2020-4427

There is no patched version named in the IBM advisory. When this was disclosed, IBM's initial position was that it would not patch the reported issues; IBM later published Security Bulletin 6206875 to address the chain. Do not invent or assume a “fixed” build number — check the bulletin for the current remediation guidance for your exact 2.0.x release, because IBM Data Risk Manager has since reached end of support.

Because no clean “upgrade to version X” path was provided for the affected line, the realistic remediation options are, in order of preference:

1. Follow IBM Security Bulletin 6206875 exactly for your installed release. Apply whatever fix or interim relief IBM documents there for your build. This is the authoritative source — this page intentionally does not substitute a version number the vendor did not publish.
2. Decommission and migrate. IBM Data Risk Manager is end-of-support. If you can, retire the appliance and move to a supported data-security posture rather than carrying a KEV-listed, unpatched appliance.
3. If you must keep it running, fully isolate it (see the containment section below) until you can decommission.

Disable SAML on the IDRM console if your environment can fall back to another supported authentication method, since the bypass is specific to the SAML flow. Confirm any such change against Bulletin 6206875 before relying on it as a fix — reconfiguring authentication is a mitigation that narrows the attack surface, not a guaranteed remediation of the underlying flaw.

If you can't remediate immediately

IDRM is a network appliance with a web console and API. The single most effective containment is to take the management interface off any network the attacker can reach. These are interim measures, not a substitute for the vendor's guidance.

1. Remove it from the internet and untrusted networks. The console and API should never be internet-reachable. Restrict access to a small admin subnet at your perimeter firewall or hypervisor network policy. If you run a firewall on the appliance itself, scope inbound access to the console/API port to your admin range only:

# On the IDRM appliance, allow the web console/API only from the admin subnet
# Replace 8443 with your IDRM console port and 10.0.0.0/24 with your admin subnet
sudo iptables -A INPUT -p tcp --dport 8443 -s 10.0.0.0/24 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 8443 -j DROP

2. Disable SAML if you can. The bypass targets the SAML login path. If your appliance can authenticate operators another supported way, turning off SAML removes the specific flow this CVE abuses. Validate against Bulletin 6206875 first.

3. Watch the console access logs. Look for unexpected administrative sessions, API calls that create or modify connections to your data sources, and downloads of configuration or credential material — those are the actions the chained exploit performs after the bypass. Investigate any admin session you cannot tie to a known operator.

Verify and review

After you act on Bulletin 6206875, confirm the result on the appliance itself, not on a host package database:

• Confirm the console version/build now matches what IBM documents as remediated for your release.
• Confirm SAML is configured the way the bulletin requires (or disabled, if that was your chosen mitigation).
• Re-run your vulnerability scanner against the appliance and confirm the CVE-2020-4427 finding has cleared. Some scanners key on the appliance banner and may lag the official metadata by a release, so corroborate against the bulletin.

Because this CVE is part of a four-bug chain that reaches root, also sweep for compromise if the appliance was reachable from untrusted networks during the exposure window: review the appliance shell history, check for unexpected accounts or cron entries, and audit any data-source connections IDRM holds in case stored credentials were exfiltrated. If you find evidence of access, rotate every credential the appliance stored, since the chained file-download bug (CVE-2020-4430) was specifically used to pull sensitive files off the host.

Frequently asked questions

Is CVE-2020-4427 remote code execution?

Not on its own. CVE-2020-4427 is an authentication bypass (CWE-287) in the IBM Data Risk Manager SAML login flow — it gives an unauthenticated remote attacker an admin session on the appliance console. In the public research that disclosed it, it was chained with CVE-2020-4428 (command injection), CVE-2020-4429 (default password), and CVE-2020-4430 (arbitrary file download) to reach unauthenticated remote code execution as root.

Which IBM Data Risk Manager versions are affected?

IDRM 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, and 2.0.6 are all affected. The condition that exposes the bypass is having SAML authentication configured on the appliance console.

What version fixes CVE-2020-4427?

IBM did not publish a clean “upgrade to version X” for the affected line, and IDRM is now end-of-support. Follow IBM Security Bulletin 6206875 for the remediation guidance that applies to your exact 2.0.x build. The safest long-term answer is to decommission and migrate off the appliance rather than carry a KEV-listed, unpatched product.

We use SAML on IDRM — can we just turn it off?

Disabling SAML removes the specific login flow this CVE abuses, so it is a sound interim mitigation if your environment can authenticate operators another supported way. Treat it as containment, not a complete fix, and validate the change against Bulletin 6206875. Also isolate the console to a trusted admin subnet, because the companion CVEs in the chain do not depend on SAML.

References

• Official vendor advisory: https://www.ibm.com/support/pages/node/6206875
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-4427
• CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• IBM X-Force entry (180532): https://exchange.xforce.ibmcloud.com/vulnerabilities/180532
• Full-disclosure advisory (Seclists): http://seclists.org/fulldisclosure/2024/Nov/0

Written by Sai Kiran Pandrala on 2026-05-25. Sourced from the official vendor advisory, the NVD record, and the CISA KEV listing. Always confirm against the vendor advisory before applying changes in production.

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