CVE-2023-28342
7.5 HIGH
📋 TL;DR
This vulnerability in Zoho ManageEngine ADSelfService Plus allows unauthenticated attackers to cause denial-of-service via the Mobile App Authentication API. It affects organizations using ADSelfService Plus for self-service password management and authentication. The attack can disrupt legitimate user access to authentication services.
💻 Affected Systems
Products:
- Zoho ManageEngine ADSelfService Plus
Versions: All versions before 6218
Operating Systems: Windows, Linux
Default Config Vulnerable:
⚠️ Yes
Notes: Affects all deployments with Mobile App Authentication enabled (default configuration).
📦 What is this software?
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⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption preventing all users from authenticating via mobile apps, potentially affecting business operations that rely on this authentication method.
Likely Case
Temporary service degradation or outages affecting mobile authentication capabilities, requiring service restart.
If Mitigated
Minimal impact with proper network segmentation and rate limiting in place.
🌐 Internet-Facing: HIGH - The Mobile App Authentication API is typically exposed to the internet for legitimate mobile app functionality.
🏢 Internal Only: MEDIUM - Internal attackers could still exploit this, but external threat is higher.
🎯 Exploit Status
Public PoC:
✅ No
Weaponized:
LIKELY
Unauthenticated Exploit:
⚠️ Yes
Complexity:
LOW
Simple API request can trigger the DoS condition without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6218 and later
Vendor Advisory: https://www.manageengine.com/products/self-service-password/advisory/CVE-2023-28342.html
Restart Required: Yes
Instructions:
1. Download ADSelfService Plus version 6218 or later from ManageEngine website. 2. Stop the ADSelfService Plus service. 3. Install the update. 4. Restart the service.
🔧 Temporary Workarounds
Disable Mobile App Authentication
allTemporarily disable the vulnerable Mobile App Authentication API feature
Navigate to Admin > Mobile App Settings > Disable Mobile App Authentication
Implement Rate Limiting
allConfigure web server or WAF to limit requests to the Mobile App Authentication API endpoint
🧯 If You Can't Patch
- Implement strict network segmentation to limit access to the ADSelfService Plus server
- Deploy a WAF with rate limiting and DoS protection rules for the Mobile App Authentication API endpoint
🔍 How to Verify
Check if Vulnerable:
Check ADSelfService Plus version in Admin Console > About. If version is below 6218, system is vulnerable.Check Version:
In ADSelfService Plus web interface: Admin > AboutVerify Fix Applied:
Verify version is 6218 or higher in Admin Console > About and test Mobile App Authentication functionality.📡 Detection & Monitoring
Log Indicators:
- High volume of requests to /MobileAppAuthenticationAPI endpoint
- Service restart events in application logs
- Error logs indicating authentication service failures
Network Indicators:
- Unusual traffic spikes to Mobile App Authentication API endpoint
- Repeated requests from single IP addresses to authentication endpoints
SIEM Query:
source="ADSelfServicePlus" AND (uri_path="/MobileAppAuthenticationAPI" OR message="authentication failure") | stats count by src_ip