CVE-2025-25477
📋 TL;DR
A host header injection vulnerability in SysPass 3.2x allows attackers to inject malicious JavaScript from arbitrary domains, which executes in victims' browsers when they access the vulnerable application. This affects all users of vulnerable SysPass versions, potentially leading to session hijacking, credential theft, or client-side attacks.
💻 Affected Systems
- SysPass
📦 What is this software?
Syspass by Syspass
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, credential theft, and client-side malware execution leading to full system compromise of affected users.
Likely Case
Session hijacking, credential theft, and client-side attacks like keylogging or form manipulation.
If Mitigated
Limited impact with proper input validation and Content Security Policy headers in place.
🎯 Exploit Status
Exploitation requires the attacker to craft malicious requests and trick users into visiting manipulated URLs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 3.2x (check vendor advisory for specific version)
Vendor Advisory: https://github.com/sysentr0py/CVEs/tree/main/CVE-2025-25477
Restart Required: No
Instructions:
1. Check current SysPass version. 2. Update to patched version from official repository. 3. Verify host header validation is properly implemented.
🔧 Temporary Workarounds
Implement strict host header validation
allConfigure web server or application to validate and sanitize host headers.
Deploy Content Security Policy (CSP)
allImplement CSP headers to restrict script sources to trusted domains only.
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block malicious host header injections.
- Restrict access to SysPass to trusted networks only and monitor for suspicious requests.
🔍 How to Verify
Check if Vulnerable:
Test by sending requests with manipulated host headers to see if they're accepted without validation.Check Version:
Check SysPass version in application interface or configuration files.Verify Fix Applied:
Verify that host headers are properly validated and CSP headers are in place.📡 Detection & Monitoring
Log Indicators:
- Unusual host header values in HTTP request logs
- Multiple failed login attempts from unexpected domains
Network Indicators:
- HTTP requests with manipulated host headers
- External JavaScript loading from untrusted domains
SIEM Query:
Search for HTTP requests with host headers containing suspicious domains or injection patterns.