CVE-2024-40465
📋 TL;DR
A vulnerability in beego's file caching mechanism allows remote attackers to write arbitrary files to the server filesystem via path traversal. This affects all beego applications running version 2.2.0 or earlier that use file caching functionality.
💻 Affected Systems
- beego
📦 What is this software?
Beego by Beego
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Arbitrary file write enabling web shell deployment, privilege escalation, or data manipulation.
If Mitigated
Limited impact if file caching is disabled or proper file permissions restrict write access.
🎯 Exploit Status
Proof-of-concept available in GitHub gist. Exploitation requires sending specially crafted requests to vulnerable endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.2.1 or later
Vendor Advisory: https://github.com/beego/beego/security/advisories
Restart Required: Yes
Instructions:
1. Update beego to v2.2.1 or later using 'go get github.com/beego/beego/v2@latest'. 2. Rebuild and redeploy your application. 3. Restart all beego services.
🔧 Temporary Workarounds
Disable file caching
allTemporarily disable beego's file caching functionality to prevent exploitation
Set CacheConfig.Adapter = "memory" in your app configuration
Restrict file permissions
linuxSet strict file permissions on cache directories to limit damage
chmod 755 /path/to/cache/directory
chown www-data:www-data /path/to/cache/directory
🧯 If You Can't Patch
- Implement WAF rules to block path traversal patterns in requests
- Isolate beego applications in containers with minimal filesystem access
🔍 How to Verify
Check if Vulnerable:
Check if beego version is ≤2.2.0 and file caching is enabled in configurationCheck Version:
go list -m github.com/beego/beego/v2Verify Fix Applied:
Verify beego version is ≥2.2.1 and test that path traversal attempts are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual file write operations in cache directories
- Requests containing '../' patterns in cache-related endpoints
Network Indicators:
- HTTP requests with path traversal sequences targeting cache endpoints
SIEM Query:
source="web_logs" AND (uri="*../*" OR uri="*cache*" OR uri="*file.go*")