CVE-2025-25907
📋 TL;DR
CVE-2025-25907 is a Cross-Site Request Forgery vulnerability in tianti v2.3 that allows attackers to trick authenticated users into performing unintended actions via crafted requests to /user/ajax/save. This affects all users of tianti v2.3 who have authenticated sessions. Attackers can execute arbitrary operations with the victim's privileges.
💻 Affected Systems
- tianti
📦 What is this software?
Tianti by Tianti Project
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, data theft, or system compromise if admin users are targeted and the endpoint allows privileged operations.
Likely Case
Unauthorized user account modifications, profile changes, or data manipulation within the application.
If Mitigated
Limited impact with proper CSRF protections, though some risk remains if other vulnerabilities exist.
🎯 Exploit Status
Requires attacker to trick authenticated user into visiting malicious page. No authentication bypass needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.4 or later
Vendor Advisory: https://github.com/xujeff/tianti/issues/39
Restart Required: No
Instructions:
1. Upgrade tianti to version 2.4 or later. 2. Verify CSRF tokens are implemented on all state-changing endpoints. 3. Test the /user/ajax/save endpoint with and without valid CSRF tokens.
🔧 Temporary Workarounds
Implement CSRF Protection
allAdd CSRF tokens to all POST/PUT/DELETE endpoints and validate them server-side.
Implement CSRF middleware that generates and validates unique tokens per session
SameSite Cookie Attribute
allSet SameSite=Strict or Lax on session cookies to prevent cross-site requests.
Set-Cookie: session=value; SameSite=Strict; HttpOnly; Secure
🧯 If You Can't Patch
- Implement web application firewall rules to detect and block CSRF patterns
- Monitor for unusual user account modifications and implement approval workflows for sensitive changes
🔍 How to Verify
Check if Vulnerable:
Test if /user/ajax/save endpoint accepts requests without CSRF tokens when user is authenticated.Check Version:
Check tianti version in application configuration or via package manager: grep -r 'version' /path/to/tianti/config/Verify Fix Applied:
Verify that /user/ajax/save endpoint rejects requests without valid CSRF tokens and that tokens are properly implemented.📡 Detection & Monitoring
Log Indicators:
- Multiple failed CSRF token validations
- Unusual user account modifications from unexpected IPs
- POST requests to /user/ajax/save without referrer headers
Network Indicators:
- Cross-origin requests to /user/ajax/save endpoint
- Requests with missing or invalid CSRF tokens
SIEM Query:
source="web_logs" AND (uri="/user/ajax/save" AND (csrf_token="" OR csrf_token=null)) AND response_code=200