CVE-2023-20886
📋 TL;DR
This CVE is an open redirect vulnerability in VMware Workspace ONE UEM console that allows attackers to redirect victims to malicious sites and potentially steal SAML responses. If exploited, it could enable unauthorized login as the victim user. Organizations using affected VMware Workspace ONE UEM versions are at risk.
💻 Affected Systems
- VMware Workspace ONE UEM console
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain unauthorized access to victim accounts, leading to data theft, privilege escalation, or further network compromise.
Likely Case
Attackers redirect users to phishing sites to steal credentials or SAML tokens, resulting in account takeover.
If Mitigated
With proper controls like patching and monitoring, impact is limited to failed redirect attempts or isolated incidents.
🎯 Exploit Status
Exploitation involves crafting malicious URLs to trigger redirects; no authentication needed, making it straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to VMSA-2023-0025 for patched versions; typically requires updating to a fixed release.
Vendor Advisory: https://www.vmware.com/security/advisories/VMSA-2023-0025.html
Restart Required: Yes
Instructions:
1. Review VMSA-2023-0025 for affected versions. 2. Download and apply the latest patch from VMware. 3. Restart the Workspace ONE UEM console services as required.
🔧 Temporary Workarounds
Input Validation and URL Filtering
allImplement server-side validation to block malicious redirect URLs and filter out unauthorized domains.
🧯 If You Can't Patch
- Restrict network access to the UEM console to trusted IPs only using firewalls.
- Monitor logs for suspicious redirect attempts and educate users on phishing risks.
🔍 How to Verify
Check if Vulnerable:
Check the VMware Workspace ONE UEM console version against the list in VMSA-2023-0025; if it matches an affected version, it is vulnerable.Check Version:
Consult VMware documentation or console interface for version details; no universal command provided.Verify Fix Applied:
After patching, verify the version is updated to a fixed release as specified in the advisory and test for redirect vulnerabilities.📡 Detection & Monitoring
Log Indicators:
- Unusual redirect requests in web server logs, especially to external domains.
Network Indicators:
- HTTP redirects to suspicious URLs in network traffic.
SIEM Query:
Example: search for 'HTTP 302' or 'redirect' events with external domains in web logs.