CVE-2020-26193
📋 TL;DR
Dell EMC PowerScale OneFS versions 8.1.0 through 9.1.0 contain an improper input validation vulnerability that allows authenticated users with the ISI_PRIV_CLUSTER privilege to execute arbitrary operating system commands on the underlying OS with application privileges. This affects all systems running vulnerable versions of PowerScale OneFS.
💻 Affected Systems
- Dell EMC PowerScale OneFS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with ISI_PRIV_CLUSTER privilege gains full control of the underlying operating system, potentially compromising the entire storage cluster, exfiltrating sensitive data, or deploying ransomware.
Likely Case
Privileged insider or compromised account executes arbitrary commands to escalate privileges, access sensitive data, or disrupt storage operations.
If Mitigated
Limited impact due to strict access controls, privilege separation, and network segmentation preventing lateral movement.
🎯 Exploit Status
Exploitation requires authenticated access with specific privilege. No public exploit code available at time of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 9.1.0 (check vendor advisory for specific patched versions)
Vendor Advisory: https://www.dell.com/support/kbdoc/en-us/000182873/dsa-2021-009-dell-powerscale-onefs-security-update-for-multiple-vulnerabilities
Restart Required: Yes
Instructions:
1. Review Dell advisory DSA-2021-009. 2. Apply the recommended OneFS update. 3. Reboot the cluster as required by the update process.
🔧 Temporary Workarounds
Restrict ISI_PRIV_CLUSTER Access
linuxLimit accounts with ISI_PRIV_CLUSTER privilege to only essential administrative users.
isi auth roles modify --privileges="ISI_PRIV_CLUSTER" --users="admin1,admin2"
🧯 If You Can't Patch
- Implement strict network segmentation to isolate PowerScale management interfaces
- Enforce multi-factor authentication and least privilege for all administrative accounts
🔍 How to Verify
Check if Vulnerable:
Check OneFS version with: isi version | grep ReleaseCheck Version:
isi versionVerify Fix Applied:
Verify version is updated beyond 9.1.0 and check for applied patches in update history📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed privilege escalation attempts
- Unexpected processes spawned from OneFS services
Network Indicators:
- Unusual outbound connections from PowerScale nodes
- Anomalous SSH or management protocol traffic
SIEM Query:
source="powerscale" AND (event_type="command_execution" OR process_name="sh" OR process_name="bash")