CVE-2025-60319
📋 TL;DR
PerfreeBlog v4.0.11 contains a Server-Side Request Forgery vulnerability in the uploadAttachByUrl API endpoint that allows attackers to make unauthorized requests from the server. This could lead to internal network scanning, data exfiltration, or service disruption. All users running PerfreeBlog v4.0.11 are affected.
💻 Affected Systems
- PerfreeBlog
📦 What is this software?
Perfreeblog by Perfree
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, exfiltrate sensitive data, or use the server as a proxy for attacks against other systems.
Likely Case
Internal network reconnaissance, accessing metadata services, or limited data exposure from internal endpoints.
If Mitigated
Minimal impact if proper network segmentation and egress filtering are implemented.
🎯 Exploit Status
Exploitation requires understanding of the API endpoint and ability to craft SSRF requests. No authentication bypass is needed beyond standard web access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in commit 103c79165e3a41a1729188fdc8a1e90c97c0a06d
Vendor Advisory: https://github.com/PerfreeBlog/PerfreeBlog/issues/20
Restart Required: No
Instructions:
1. Update to the latest PerfreeBlog version containing commit 103c79165e3a41a1729188fdc8a1e90c97c0a06d
2. Replace AttachController.java with the patched version
3. Recompile and redeploy the application
🔧 Temporary Workarounds
Network Egress Filtering
allImplement firewall rules to restrict outbound connections from the PerfreeBlog server to only necessary services.
Endpoint Access Control
allRestrict access to the uploadAttachByUrl endpoint using web application firewall rules or authentication requirements.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the PerfreeBlog server from sensitive internal networks
- Deploy a web application firewall with SSRF detection rules to block malicious requests
🔍 How to Verify
Check if Vulnerable:
Check if AttachController.java contains the vulnerable uploadAttachByUrl method without proper URL validation and authorization checks.Check Version:
Check PerfreeBlog version in admin panel or examine pom.xml for version informationVerify Fix Applied:
Verify that commit 103c79165e3a41a1729188fdc8a1e90c97c0a06d is present in your codebase and that URL validation has been implemented.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from server
- Requests to internal IP addresses or metadata services
- Multiple failed upload attempts with external URLs
Network Indicators:
- Unexpected outbound connections from PerfreeBlog server to internal services
- Traffic to cloud metadata endpoints (169.254.169.254, etc.)
SIEM Query:
source="perfreeblog" AND (url CONTAINS "uploadAttachByUrl" OR dest_ip IN [internal_ranges, metadata_services])