CVE-2025-27776
📋 TL;DR
Applio versions 3.2.7 and earlier contain a server-side request forgery (SSRF) vulnerability in model_download.py that allows attackers to send requests from the server to internal networks. Combined with an arbitrary file write vulnerability, this can lead to remote code execution. All Applio users running vulnerable versions are affected.
💻 Affected Systems
- Applio
📦 What is this software?
Applio by Applio
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution on the Applio server through SSRF combined with file write and unsafe deserialization, potentially leading to complete system compromise.
Likely Case
Internal network reconnaissance and data exfiltration through SSRF, potentially reading files from internal systems when combined with CVE-2025-27784.
If Mitigated
Limited impact if network segmentation prevents internal network access and file system permissions restrict write operations.
🎯 Exploit Status
Exploitation requires chaining multiple vulnerabilities for full impact; SSRF component is straightforward to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: None
Restart Required: No
Instructions:
No official patch available. Monitor Applio GitHub repository for updates.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict Applio server's network access to prevent SSRF exploitation of internal systems
iptables -A OUTPUT -p tcp --dport 80 -j DROP
iptables -A OUTPUT -p tcp --dport 443 -j DROP
File System Restrictions
linuxRun Applio with minimal file system write permissions to limit file write impact
chmod -R 755 /path/to/applio
chown -R nobody:nogroup /path/to/applio
🧯 If You Can't Patch
- Isolate Applio server in a restricted network segment with no access to internal systems
- Implement strict egress filtering to block outbound requests from the Applio server
🔍 How to Verify
Check if Vulnerable:
Check Applio version; if version is 3.2.7 or earlier, system is vulnerableCheck Version:
Check version in Applio interface or configuration filesVerify Fix Applied:
Verify Applio version is higher than 3.2.7 when patch becomes available📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from Applio server
- File write operations in unexpected locations
Network Indicators:
- HTTP requests from Applio server to internal IP addresses
- Unexpected outbound connections on ports 80/443
SIEM Query:
source="applio" AND (dest_ip IN (RFC1918_ranges) OR action="file_write")🔗 References
- https://github.com/IAHispano/Applio/blob/29b4a00e4be209f9aac51cd9ccffcc632dfb2973/assets/flask/routes.py#L14
- https://github.com/IAHispano/Applio/blob/29b4a00e4be209f9aac51cd9ccffcc632dfb2973/rvc/lib/tools/model_download.py#L240
- https://github.com/IAHispano/Applio/blob/29b4a00e4be209f9aac51cd9ccffcc632dfb2973/tabs/download/download.py#L192-L196
- https://securitylab.github.com/advisories/GHSL-2024-341_GHSL-2024-353_Applio/
