CVE-2023-4550
📋 TL;DR
CVE-2023-4550 is an improper input validation vulnerability in OpenText AppBuilder that allows unauthenticated or authenticated users to read arbitrary files on the server. This affects AppBuilder versions from 21.2 before 23.2 on both Windows and Linux systems.
💻 Affected Systems
- OpenText AppBuilder
📦 What is this software?
Appbuilder by Opentext
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read sensitive system files, configuration files, or application data, potentially leading to credential theft, privilege escalation, or complete system compromise.
Likely Case
Unauthorized file disclosure including configuration files, logs, and potentially sensitive application data.
If Mitigated
Limited to reading files accessible to the AppBuilder process, but still significant information disclosure risk.
🎯 Exploit Status
The vulnerability description suggests exploitation is straightforward via a specific page in AppBuilder. No public exploit code has been identified at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 23.2 or later
Vendor Advisory: https://support.opentext.com/csm?id=ot_kb_search&kb_category=61648712db61781068cfd6c4e296197b
Restart Required: Yes
Instructions:
1. Download AppBuilder version 23.2 or later from OpenText support portal. 2. Backup current configuration and data. 3. Install the updated version following OpenText's upgrade documentation. 4. Restart the AppBuilder service. 5. Verify the installation and test functionality.
🔧 Temporary Workarounds
Network Access Control
allRestrict network access to AppBuilder instances to only trusted IP addresses or networks.
Web Application Firewall Rules
allImplement WAF rules to block requests to the vulnerable page or patterns of file path traversal.
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit access to AppBuilder instances
- Deploy a web application firewall with specific rules to detect and block file path traversal attempts
🔍 How to Verify
Check if Vulnerable:
Check AppBuilder version via administrative interface or configuration files. Versions 21.2 through 23.1 are vulnerable.Check Version:
Check AppBuilder web interface admin panel or consult installation documentation for version verification methods.Verify Fix Applied:
Verify AppBuilder version is 23.2 or later and test that file path traversal attempts are properly rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns in AppBuilder logs
- Requests containing path traversal sequences (../, ..\)
- Access to sensitive file paths from AppBuilder
Network Indicators:
- HTTP requests with file path parameters to AppBuilder endpoints
- Unusual outbound data transfers from AppBuilder servers
SIEM Query:
source="appbuilder.log" AND ("..\" OR "../" OR "file=" OR "path=")