CVE-2020-25260
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Hyland OnBase systems due to unsafe JSON deserialization. Attackers can achieve remote code execution (RCE) by sending specially crafted JSON payloads. All OnBase installations running affected versions are vulnerable.
💻 Affected Systems
- Hyland OnBase
📦 What is this software?
Onbase by Hyland
Onbase by Hyland
Onbase by Hyland
Onbase by Hyland
Onbase by Hyland
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the OnBase server, allowing data theft, ransomware deployment, and lateral movement within the network.
Likely Case
Remote code execution leading to data exfiltration, installation of backdoors, and disruption of business operations.
If Mitigated
If proper network segmentation and input validation are in place, impact may be limited to the OnBase application server only.
🎯 Exploit Status
Exploitation requires no authentication and has been weaponized in the wild. Attackers can send malicious JSON payloads to vulnerable endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions above those listed in affected versions
Vendor Advisory: https://www.hyland.com/en/security-advisories
Restart Required: Yes
Instructions:
1. Contact Hyland support for appropriate patches. 2. Apply patches to all affected OnBase servers. 3. Restart OnBase services. 4. Test functionality after patching.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to OnBase servers to only trusted IP addresses and required users.
WAF Rules
allImplement Web Application Firewall rules to block malicious JSON payloads and deserialization attacks.
🧯 If You Can't Patch
- Isolate OnBase servers in a separate network segment with strict access controls
- Implement application-level input validation to reject suspicious JSON structures
🔍 How to Verify
Check if Vulnerable:
Check OnBase version against affected version list. Review application logs for unusual JSON deserialization errors.Check Version:
Check OnBase administration console or server properties for version informationVerify Fix Applied:
Verify OnBase version is above affected versions. Test that malicious JSON payloads no longer execute code.📡 Detection & Monitoring
Log Indicators:
- Unusual JSON parsing errors
- Unexpected process creation from OnBase services
- Large or malformed JSON payloads in request logs
Network Indicators:
- Unusual outbound connections from OnBase servers
- Suspicious HTTP POST requests with JSON payloads to OnBase endpoints
SIEM Query:
source="onbase" AND ("JSON deserialization" OR "unexpected process" OR "malformed request")