CVE-2021-21531
📋 TL;DR
This vulnerability allows a local authenticated user with monitor role privileges in Dell Unisphere for PowerMax to bypass authorization controls and perform unauthorized actions. It affects Dell Unisphere for PowerMax versions prior to 9.2.1.6, potentially enabling privilege escalation or unauthorized modifications.
💻 Affected Systems
- Dell Unisphere for PowerMax
📦 What is this software?
Solutions Enabler Virtual Appliance by Dell
View all CVEs affecting Solutions Enabler Virtual Appliance →
Solutions Enabler Virtual Appliance by Dell
View all CVEs affecting Solutions Enabler Virtual Appliance →
⚠️ Risk & Real-World Impact
Worst Case
An attacker could gain administrative privileges, modify system configurations, access sensitive data, or disrupt operations, leading to data breaches or service outages.
Likely Case
A malicious insider or compromised account could escalate privileges to perform unauthorized administrative tasks, such as changing settings or accessing restricted information.
If Mitigated
With proper access controls and monitoring, impact is limited to minor unauthorized actions, quickly detected and contained.
🎯 Exploit Status
Exploitation requires local authenticated access with monitor role; no public proof-of-concept available as per references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.2.1.6
Vendor Advisory: https://www.dell.com/support/kbdoc/000184565
Restart Required: Yes
Instructions:
1. Download the patch from Dell support site. 2. Backup system configurations. 3. Apply the update to Dell Unisphere for PowerMax. 4. Restart the service or system as required. 5. Verify the update by checking the version.
🔧 Temporary Workarounds
Restrict Monitor Role Access
allLimit or remove monitor role privileges for users who do not require them to reduce attack surface.
Use Dell Unisphere administrative interface to modify user roles and permissions.
🧯 If You Can't Patch
- Implement strict access controls and least privilege principles to minimize users with monitor roles.
- Enhance monitoring and logging for unauthorized actions by users with monitor roles to detect exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check the Dell Unisphere for PowerMax version via the administrative interface or system logs; if version is prior to 9.2.1.6, it is vulnerable.Check Version:
Use the Dell Unisphere CLI or web interface to run 'show version' or check system information for the version number.Verify Fix Applied:
After patching, confirm the version is 9.2.1.6 or later using the version check command or administrative interface.📡 Detection & Monitoring
Log Indicators:
- Unusual activity by users with monitor roles, such as unauthorized configuration changes or access attempts to restricted areas.
Network Indicators:
- Not applicable, as this is a local vulnerability requiring authenticated access.
SIEM Query:
Search for logs from Dell Unisphere showing user with monitor role performing actions outside typical monitoring scope, e.g., 'event:authorization_failure' or 'user_role:monitor AND action:modify'.