CVE-2025-23195
📋 TL;DR
An XML External Entity (XXE) vulnerability in Apache Ambari/Oozie allows attackers to inject malicious XML entities due to insecure parsing with DocumentBuilderFactory. This enables reading arbitrary server files or performing SSRF attacks. Systems running vulnerable Ambari/Oozie versions are affected.
💻 Affected Systems
- Apache Ambari
- Apache Oozie
📦 What is this software?
Ambari by Apache
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise via sensitive file disclosure (passwords, keys) or internal network access through SSRF leading to lateral movement.
Likely Case
Unauthorized file system access to read configuration files, logs, or sensitive data stored on the server.
If Mitigated
Limited impact if XML input validation and proper network segmentation are implemented.
🎯 Exploit Status
Requires ability to submit XML input to vulnerable endpoints; no authentication bypass mentioned.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Ambari 2.7.9, Oozie trunk branch
Vendor Advisory: https://lists.apache.org/thread/hsb6mvxd7g37dq1ygtd0pd88gs9tfcwq
Restart Required: No
Instructions:
1. Upgrade Ambari to version 2.7.9 or later. 2. For Oozie, update to the latest trunk branch. 3. Verify XML parsing now disables external entities.
🔧 Temporary Workarounds
Disable XXE in DocumentBuilderFactory
allConfigure XML parsers to disable external entity resolution before parsing untrusted XML.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setFeature("http://xml.org/sax/features/external-general-entities", false);
dbf.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
dbf.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
🧯 If You Can't Patch
- Implement strict XML input validation and sanitization at application boundaries.
- Use network segmentation to limit server access and implement WAF rules to block XXE patterns.
🔍 How to Verify
Check if Vulnerable:
Review code for DocumentBuilderFactory usage without XXE protection features enabled.Check Version:
ambari-server --version (for Ambari) or check Oozie build versionVerify Fix Applied:
Test XML endpoints with XXE payloads; successful file reads indicate vulnerability.📡 Detection & Monitoring
Log Indicators:
- Unusual XML parsing errors
- File access attempts via XML entities
- Outbound requests from server to internal systems
Network Indicators:
- XML payloads containing external entity references
- Unexpected outbound HTTP requests from server
SIEM Query:
source="ambari.log" OR source="oozie.log" AND (message="*DOCTYPE*" OR message="*ENTITY*" OR message="*file:*")