CVE-2021-41352: SCOM Information Disclosure Vulnerability

CVE-2021-41352 Overview

CVE-2021-41352 is an information disclosure vulnerability affecting Microsoft System Center Operations Manager (SCOM). This vulnerability allows unauthenticated remote attackers to access sensitive information from affected SCOM installations without requiring any user interaction. The flaw enables unauthorized exposure of confidential data that could be leveraged for further attacks against enterprise monitoring infrastructure.

Critical Impact

This information disclosure vulnerability in Microsoft SCOM can expose sensitive configuration and operational data to unauthenticated attackers, potentially enabling reconnaissance for more sophisticated follow-up attacks against enterprise environments.

Affected Products

• Microsoft System Center Operations Manager 2012 R2
• Microsoft System Center Operations Manager 2016
• Microsoft System Center Operations Manager 2019

Discovery Timeline

• October 13, 2021 - CVE-2021-41352 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2021-41352

Vulnerability Analysis

This information disclosure vulnerability in Microsoft System Center Operations Manager represents a significant security risk for enterprise environments utilizing SCOM for infrastructure monitoring. The vulnerability can be exploited remotely over the network without requiring authentication or user interaction, making it particularly dangerous in environments where SCOM components are network-accessible.

The vulnerability allows attackers to extract sensitive information from SCOM deployments. Given SCOM's role as a centralized monitoring solution, the exposed information could include details about monitored systems, network topology, configuration parameters, and potentially credentials or connection strings used for monitoring various infrastructure components.

Root Cause

The root cause of this vulnerability stems from insufficient access controls or improper handling of sensitive data within the SCOM web components. Microsoft has not disclosed specific technical details about the underlying flaw, categorizing it under "NVD-CWE-noinfo" in the Common Weakness Enumeration database. This typically indicates an information exposure issue where sensitive data can be accessed by unauthorized parties through network-accessible interfaces.

Attack Vector

The attack vector for CVE-2021-41352 is network-based, allowing remote exploitation. An attacker can exploit this vulnerability by sending specially crafted requests to vulnerable SCOM installations. The attack requires no authentication credentials and no user interaction, enabling fully automated exploitation against exposed SCOM infrastructure.

The exploitation scenario typically involves:

1. Identifying network-accessible SCOM web console or API endpoints
2. Sending crafted HTTP requests to specific SCOM components
3. Extracting sensitive information from server responses
4. Using disclosed information for reconnaissance or further attacks

Detection Methods for CVE-2021-41352

Indicators of Compromise

• Unusual or unexpected HTTP requests targeting SCOM web console endpoints from external IP addresses
• Anomalous access patterns to SCOM configuration or API endpoints without valid authentication
• Unexpected data exfiltration or large response payloads from SCOM web services
• Log entries showing access to sensitive SCOM resources from unauthorized sources

Detection Strategies

• Monitor IIS logs on SCOM management servers for suspicious request patterns or unauthorized access attempts
• Implement network intrusion detection rules to identify exploitation attempts against SCOM web interfaces
• Review SCOM operational logs for anomalous queries or configuration access events
• Deploy web application firewall rules to detect and block malicious requests targeting known SCOM endpoints

Monitoring Recommendations

• Enable detailed logging on SCOM web console and API components
• Configure alerting for failed authentication attempts and unusual access patterns to SCOM management servers
• Implement network segmentation monitoring to detect unauthorized access attempts to SCOM infrastructure
• Establish baseline behavior for SCOM web traffic and alert on deviations

How to Mitigate CVE-2021-41352

Immediate Actions Required

• Apply the Microsoft security update for CVE-2021-41352 immediately to all affected SCOM installations
• Restrict network access to SCOM management servers and web consoles using firewall rules
• Review SCOM deployment for any signs of prior exploitation or unauthorized data access
• Implement network segmentation to limit exposure of SCOM components to trusted networks only

Patch Information

Microsoft has released security updates to address CVE-2021-41352. Administrators should consult the Microsoft Security Advisory CVE-2021-41352 for detailed patch information and download links specific to their SCOM version. The advisory provides guidance for System Center Operations Manager 2012 R2, 2016, and 2019 installations.

Workarounds

• Implement strict network access controls limiting SCOM web console access to authorized management workstations only
• Deploy a reverse proxy or web application firewall in front of SCOM web services to filter malicious requests
• Disable or restrict access to SCOM web console features until patches can be applied
• Consider temporarily isolating SCOM management servers from untrusted network segments

# Example: Restrict SCOM web console access using Windows Firewall
# Block external access to SCOM web console port (default 443)
netsh advfirewall firewall add rule name="Block SCOM External Access" dir=in action=block protocol=tcp localport=443 remoteip=any
# Allow access only from trusted management subnet
netsh advfirewall firewall add rule name="Allow SCOM Management Access" dir=in action=allow protocol=tcp localport=443 remoteip=10.0.0.0/24