CVE-2020-4561 – This vulnerability allows unauthenticated remot... (How to Fix)

Q: What is the severity of CVE-2020-4561?

CVE-2020-4561 has a CVSS score of 10.0 (CRITICAL). This vulnerability allows unauthenticated remote attackers to read and write files on IBM Cognos Analytics systems by exploiting the DQM API. It affects IBM Cognos Analytics 11.0 and 11.1 installations with exposed endpoints. Attackers can access valid CA endpoints without authentication to exploit this flaw.

📋 TL;DR

This vulnerability allows unauthenticated remote attackers to read and write files on IBM Cognos Analytics systems by exploiting the DQM API. It affects IBM Cognos Analytics 11.0 and 11.1 installations with exposed endpoints. Attackers can access valid CA endpoints without authentication to exploit this flaw.

💻 Affected Systems

Products:

IBM Cognos Analytics

Versions: 11.0 and 11.1

Operating Systems: All supported platforms

Default Config Vulnerable: ⚠️ Yes

Notes: Affects systems with DQM API accessible. Default installations are vulnerable if endpoints are exposed.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise including data theft, ransomware deployment, and persistent backdoor installation leading to full organizational breach.

🟠

Likely Case

Unauthorized file access leading to sensitive data exfiltration, configuration tampering, or malware injection.

🟢

If Mitigated

Limited impact with proper network segmentation and authentication controls preventing external access.

🌐 Internet-Facing: HIGH - Directly exploitable without authentication from internet-facing systems.

🏢 Internal Only: HIGH - Even internal systems are vulnerable to network-accessible attacks without proper segmentation.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires only network access to vulnerable endpoint with no authentication needed.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Apply IBM Cognos Analytics Interim Fixes as specified in vendor advisory

Vendor Advisory: https://www.ibm.com/support/pages/node/6451705

Restart Required: Yes

Instructions:

1. Review IBM advisory 2. Download appropriate interim fix 3. Apply fix following IBM documentation 4. Restart Cognos services 5. Verify fix application

🔧 Temporary Workarounds

Network Access Restriction

all

Restrict network access to Cognos Analytics endpoints to trusted IPs only

Use firewall rules to limit access to Cognos ports (default 9300, 9301)

Authentication Enforcement

all

Ensure all API endpoints require authentication before processing requests

Configure Cognos security to require authentication for all API calls

🧯 If You Can't Patch

Isolate Cognos Analytics systems in restricted network segments with no internet access
Implement strict firewall rules allowing only necessary traffic from authorized sources

🔍 How to Verify

Check if Vulnerable:

Check if Cognos Analytics version is 11.0 or 11.1 and DQM API endpoints are accessible without authentication

Check Version:

Check Cognos version through administration console or configuration files

Verify Fix Applied:

Verify interim fix is applied via IBM fix verification procedures and test that unauthenticated API requests are rejected

📡 Detection & Monitoring

Log Indicators:

Unauthenticated API requests to DQM endpoints
File access/modification patterns from unauthenticated sessions

Network Indicators:

Unusual file transfer patterns from Cognos servers
Unauthenticated requests to Cognos API endpoints

SIEM Query:

source="cognos" AND (event="unauthenticated" OR event="api_access") AND (resource="dqm" OR resource="file")

📊 Metadata

CVE ID: CVE-2020-4561

CVSS v3 Score: 10.0 (CRITICAL)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CWE: CWE-829

Published: June 1, 2021

Last Updated: November 21, 2024

🔗 References

https://exchange.xforce.ibmcloud.com/vulnerabilities/183903 VDB Entry,Vendor Advisory
https://security.netapp.com/advisory/ntap-20210622-0004/ Third Party Advisory
https://www.ibm.com/support/pages/node/6451705 Patch,Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/183903 VDB Entry,Vendor Advisory
https://security.netapp.com/advisory/ntap-20210622-0004/ Third Party Advisory
https://www.ibm.com/support/pages/node/6451705 Patch,Vendor Advisory

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