CVE-2018-0705
📋 TL;DR
CVE-2018-0705 is a directory traversal vulnerability in Cybozu Dezie that allows remote attackers to read arbitrary files on the server via specially crafted HTTP requests. This affects organizations running vulnerable versions of Cybozu Dezie web application servers.
💻 Affected Systems
- Cybozu Dezie
📦 What is this software?
Dezie by Cybozu
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read sensitive files including configuration files, password files, database credentials, and other confidential data, potentially leading to complete system compromise.
Likely Case
Attackers exfiltrate sensitive configuration files and user data, enabling further attacks or data theft.
If Mitigated
With proper network segmentation and access controls, impact is limited to the application server's file system.
🎯 Exploit Status
Directory traversal vulnerabilities are typically easy to exploit with simple HTTP requests using ../ sequences.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.1.3 and later
Vendor Advisory: https://kb.cybozu.support/article/34089/
Restart Required: Yes
Instructions:
1. Download Cybozu Dezie version 8.1.3 or later from Cybozu support portal. 2. Backup current installation and data. 3. Stop the Dezie service. 4. Install the updated version. 5. Restart the service. 6. Verify the update was successful.
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allConfigure WAF rules to block directory traversal patterns in HTTP requests
Network Segmentation
allRestrict network access to Cybozu Dezie instances to only trusted networks
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the Cybozu Dezie service
- Deploy a web application firewall with rules specifically blocking directory traversal patterns
🔍 How to Verify
Check if Vulnerable:
Check if running Cybozu Dezie version 8.0.2 through 8.1.2. Attempt to access files outside web root using ../ sequences in URLs.Check Version:
Check the Cybozu Dezie administration interface or installation directory for version informationVerify Fix Applied:
Verify Cybozu Dezie version is 8.1.3 or later. Test that directory traversal attempts no longer succeed.📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing ../ sequences
- Access to files outside normal web directories
- Failed file access attempts with traversal patterns
Network Indicators:
- HTTP requests with multiple ../ sequences in URL parameters or paths
- Unusual file access patterns from external IPs
SIEM Query:
source="cybozu_dezie" AND (url="*../*" OR url="*..%2f*" OR url="*%2e%2e%2f*")