CVE-2023-27874
📋 TL;DR
IBM Aspera Faspex 4.4.2 contains an XML external entity injection (XXE) vulnerability that allows authenticated remote attackers to read arbitrary files and potentially execute commands on the server. This affects organizations using IBM Aspera Faspex for high-speed file transfers. The vulnerability requires authentication but poses critical risk due to the high CVSS score.
💻 Affected Systems
- IBM Aspera Faspex
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote authenticated attacker gains complete system control, reads sensitive files, executes arbitrary commands, and potentially pivots to other systems.
Likely Case
Attacker reads sensitive configuration files, extracts credentials, and gains foothold for further exploitation.
If Mitigated
With proper network segmentation and authentication controls, impact limited to isolated file transfer system.
🎯 Exploit Status
XXE vulnerabilities are well-understood and often weaponized quickly. Authentication requirement reduces immediate risk but doesn't eliminate it.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.4.2 Patch Level 1 or later
Vendor Advisory: https://www.ibm.com/support/pages/node/6964694
Restart Required: Yes
Instructions:
1. Download patch from IBM Fix Central. 2. Backup current installation. 3. Apply patch following IBM instructions. 4. Restart Aspera Faspex services. 5. Verify patch installation.
🔧 Temporary Workarounds
Disable XML external entity processing
allConfigure XML parser to disable external entity resolution
Modify XML parser configuration to set features: FEATURE_SECURE_PROCESSING=true, disallow-doctype-decl=true
Network segmentation
allRestrict access to Aspera Faspex to trusted networks only
Configure firewall rules to limit inbound connections to specific IP ranges
🧯 If You Can't Patch
- Implement strict authentication controls and monitor for suspicious login attempts
- Deploy web application firewall with XXE protection rules
🔍 How to Verify
Check if Vulnerable:
Check Aspera Faspex version via admin interface or configuration filesCheck Version:
Check Aspera Faspex web interface or configuration files for version informationVerify Fix Applied:
Verify patch installation through admin interface showing version 4.4.2 Patch Level 1 or later📡 Detection & Monitoring
Log Indicators:
- Unusual XML file uploads
- Multiple authentication attempts from single source
- System file access attempts
Network Indicators:
- XML payloads with external entity references
- Outbound connections to unexpected destinations
SIEM Query:
source="aspera" AND (xml OR xxe OR entity) AND (error OR exception OR failed)