CVE-2019-25355
📋 TL;DR
CVE-2019-25355 is a directory traversal vulnerability in gSOAP 2.8 that allows unauthenticated attackers to access sensitive system files by manipulating HTTP requests with path traversal sequences. This affects any system running vulnerable versions of gSOAP web services, potentially exposing configuration files, passwords, and other sensitive data.
💻 Affected Systems
- gSOAP
📦 What is this software?
Gsoap by Genivia
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through retrieval of sensitive files like SSH keys, configuration files with credentials, or shadow password files, leading to privilege escalation and lateral movement.
Likely Case
Exfiltration of sensitive configuration files, application secrets, and system information that could enable further attacks.
If Mitigated
Limited to read-only access of non-critical files if proper file permissions and web server configurations restrict access.
🎯 Exploit Status
Public exploit code available on Exploit-DB (47653) demonstrates simple HTTP GET requests with '../' sequences to retrieve files like /etc/passwd.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: gSOAP 2.8.104 or later
Vendor Advisory: https://www.genivia.com/advisory.html
Restart Required: Yes
Instructions:
1. Download latest gSOAP version from genivia.com. 2. Replace vulnerable gSOAP libraries. 3. Recompile and redeploy affected applications. 4. Restart web services using gSOAP.
🔧 Temporary Workarounds
Input Validation Filter
allImplement web application firewall or input validation to block requests containing '../' sequences
# Example mod_security rule for Apache:
SecRule REQUEST_URI "\.\./" "id:1001,phase:1,deny,status:403,msg:'Path Traversal Attempt'
File Permission Restrictions
linuxRun gSOAP services with minimal privileges and restrict file system access
# Run as non-root user:
useradd -r -s /bin/false gsoapuser
chown -R gsoapuser:gsoapuser /path/to/gsoap
🧯 If You Can't Patch
- Implement network segmentation to isolate gSOAP services from sensitive systems
- Deploy web application firewall with rules to detect and block path traversal patterns
🔍 How to Verify
Check if Vulnerable:
Test with curl: curl -v 'http://target/path/../../../../etc/passwd' or use the public exploit PoCCheck Version:
Check gSOAP version in application logs or compile output, or run: strings libgsoap.so | grep -i 'gsoap version'Verify Fix Applied:
Attempt the same traversal attack after patching - should return 403/404 error instead of file contents📡 Detection & Monitoring
Log Indicators:
- HTTP GET requests containing '../' sequences
- Unusual file access patterns from web service process
- 403/404 errors for traversal attempts if blocked
Network Indicators:
- HTTP requests with multiple '../' in URL path
- GET requests for known sensitive files like /etc/passwd, /etc/shadow
SIEM Query:
source="web_logs" AND (url="*../*" OR url="*/etc/passwd" OR url="*/etc/shadow")