CVE-2022-22990
📋 TL;DR
CVE-2022-22990 is an authentication bypass vulnerability in Western Digital My Cloud devices that allows attackers to bypass limited authentication checks, potentially leading to remote code execution and privilege escalation. This affects My Cloud OS5 devices running vulnerable firmware versions. Attackers could gain unauthorized access to network-attached storage systems.
💻 Affected Systems
- Western Digital My Cloud devices running My Cloud OS5
📦 What is this software?
My Cloud Os by Westerndigital
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with remote code execution, data theft, ransomware deployment, and persistent backdoor installation on affected My Cloud devices.
Likely Case
Unauthorized access to stored files, configuration tampering, and potential lateral movement within the network from compromised storage devices.
If Mitigated
Limited impact with proper network segmentation and access controls, potentially only exposing storage data without system compromise.
🎯 Exploit Status
Multiple advisories confirm exploitation details. Attack requires some authentication bypass but leads to RCE.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: My Cloud OS5 firmware version 5.19.117
Vendor Advisory: https://www.westerndigital.com/support/product-security/wdc-22002-my-cloud-os5-firmware-5-19-117
Restart Required: Yes
Instructions:
1. Log into My Cloud device web interface. 2. Navigate to Settings > Firmware Update. 3. Check for updates and install version 5.19.117 or later. 4. Reboot device after installation completes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate My Cloud devices from internet and restrict internal network access
Access Control Lists
allImplement strict firewall rules to limit device access to trusted IPs only
🧯 If You Can't Patch
- Disable remote access features and ensure devices are not internet-facing
- Implement strict network segmentation and monitor for unusual authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version in My Cloud web interface under Settings > Firmware Update. Versions below 5.19.117 are vulnerable.Check Version:
Check via web interface or SSH if enabled: cat /etc/versionVerify Fix Applied:
Confirm firmware version shows 5.19.117 or higher after update. Test authentication mechanisms for proper token validation.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful access
- Unusual PHP script execution patterns
- Access from unexpected IP addresses
Network Indicators:
- HTTP requests bypassing authentication endpoints
- Unusual traffic to PHP scripts on port 80/443
SIEM Query:
source="mycloud.log" AND ("authentication bypass" OR "PHP script" AND "unauthorized")🔗 References
- https://www.westerndigital.com/support/product-security/wdc-22002-my-cloud-os5-firmware-5-19-117
- https://www.zerodayinitiative.com/advisories/ZDI-22-076/
- https://www.zerodayinitiative.com/advisories/ZDI-22-347/
- https://www.westerndigital.com/support/product-security/wdc-22002-my-cloud-os5-firmware-5-19-117
- https://www.zerodayinitiative.com/advisories/ZDI-22-076/
- https://www.zerodayinitiative.com/advisories/ZDI-22-347/
