CVE-2022-26851
📋 TL;DR
Dell PowerScale OneFS versions 8.2.2 through 9.3.x contain a predictable file name vulnerability that allows unprivileged network attackers to potentially cause data loss. The vulnerability stems from observable state information that can be used to predict file names, enabling attackers to manipulate or delete files. This affects all Dell PowerScale OneFS deployments running vulnerable versions.
💻 Affected Systems
- Dell PowerScale OneFS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete data loss or corruption of critical files through predictable file name manipulation by an unprivileged attacker.
Likely Case
Targeted data deletion or corruption of specific files accessible to the attacker through predictable naming patterns.
If Mitigated
Limited impact with proper network segmentation and access controls preventing unprivileged network access to affected systems.
🎯 Exploit Status
Exploitation requires understanding of the predictable naming pattern and network access to the system. No public exploit code has been identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.4.0.0 and later
Vendor Advisory: https://www.dell.com/support/kbdoc/en-us/000197991/dell-emc-powerscale-onefs-security-update-for-multiple-component-vulnerabilities
Restart Required: Yes
Instructions:
1. Download the latest OneFS update from Dell Support. 2. Apply the update following Dell's upgrade procedures. 3. Reboot the PowerScale cluster to complete the update.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to PowerScale systems to only trusted administrative networks.
Access Control Lists
allImplement strict file and directory permissions to limit what unprivileged users can access.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate PowerScale systems from untrusted networks.
- Enable comprehensive logging and monitoring for file access patterns and implement alerting for suspicious activity.
🔍 How to Verify
Check if Vulnerable:
Check the OneFS version using 'isi version' command. If version is between 8.2.2 and 9.3.x inclusive, the system is vulnerable.Check Version:
isi versionVerify Fix Applied:
After patching, verify the version is 9.4.0.0 or later using 'isi version' command.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns from unprivileged users
- Multiple failed file access attempts followed by successful manipulation
- File deletion or modification events from unexpected sources
Network Indicators:
- Network traffic to PowerScale systems from unauthorized sources
- Patterns of file access requests that follow predictable naming conventions
SIEM Query:
source="powerscale_logs" AND (event_type="file_access" OR event_type="file_modify") AND user="unprivileged" AND file_name MATCHES "predictable_pattern*"