CVE-2021-27704
📋 TL;DR
CVE-2021-27704 is an incorrect access control vulnerability in Appspace 6.2.4 that allows attackers to bypass authentication via the password reset page. This affects organizations using Appspace Web Portal for digital signage and workplace management. Attackers could potentially reset passwords for arbitrary accounts without proper authorization.
💻 Affected Systems
- Appspace
📦 What is this software?
Appspace by Appspace
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access to Appspace systems, enabling complete compromise of digital signage networks, data exfiltration, and lateral movement to connected systems.
Likely Case
Attackers reset passwords for standard user accounts to gain unauthorized access to Appspace content management and potentially escalate privileges.
If Mitigated
With proper network segmentation and monitoring, impact is limited to isolated Appspace instances with minimal data exposure.
🎯 Exploit Status
The GitHub reference contains technical details that could be used to create exploits. The vulnerability involves bypassing access controls on password reset functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 6.2.4
Vendor Advisory: https://www.appspace.com/support/security-advisories/
Restart Required: Yes
Instructions:
1. Upgrade Appspace to version 6.2.5 or later. 2. Apply the update through Appspace administration console. 3. Restart Appspace services. 4. Verify the fix by testing password reset functionality.
🔧 Temporary Workarounds
Disable Password Reset
allTemporarily disable password reset functionality in Appspace Web Portal
# Requires Appspace administrative access to modify portal settings
Network Access Control
allRestrict access to Appspace Web Portal to trusted IP addresses only
# Configure firewall rules to limit access to Appspace portal
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Appspace systems from critical infrastructure
- Enable detailed logging and monitoring of all authentication attempts and password reset activities
🔍 How to Verify
Check if Vulnerable:
Check Appspace version in administration console. If version is 6.2.4, the system is vulnerable.Check Version:
# In Appspace admin console: System > About, or check Appspace installation directoryVerify Fix Applied:
After patching, attempt to reproduce the password reset bypass. Successful password resets should require proper authentication.📡 Detection & Monitoring
Log Indicators:
- Multiple failed password reset attempts from single IP
- Successful password resets without proper authentication
- Unusual account access patterns after password reset
Network Indicators:
- HTTP POST requests to password reset endpoints with unusual parameters
- Traffic to Appspace Web Portal from unexpected sources
SIEM Query:
source="appspace" AND (event_type="password_reset" OR uri_path="/password/reset") AND status="success"