CVE-2023-44915
📋 TL;DR
This cross-site scripting (XSS) vulnerability in c3crm's login page allows attackers to inject malicious scripts that execute in users' browsers when they view error messages. Anyone using c3crm versions up to 3.0.4 is affected, particularly organizations using this CRM software for customer management.
💻 Affected Systems
- c3crm
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on user systems through the vulnerable login page.
Likely Case
Session hijacking leading to unauthorized access to CRM data, phishing attacks via login page redirection, or credential theft from legitimate users.
If Mitigated
With proper input validation and output encoding, the attack would fail to execute scripts, limiting impact to benign error message display.
🎯 Exploit Status
XSS payloads can be delivered via login_error parameter without authentication; exploitation requires user interaction with the login page.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: unknown
Vendor Advisory: unknown
Restart Required: No
Instructions:
1. Check for updated version beyond 3.0.4 from official sources. 2. If available, backup data and configuration. 3. Replace vulnerable Login.php with patched version. 4. Test login functionality.
🔧 Temporary Workarounds
Input Validation Filter
allAdd server-side validation to sanitize login_error parameter before display
Modify Login.php around line 108 to filter/escape user input
WAF Rule
allImplement web application firewall rules to block XSS payloads in login_error parameter
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Disable or restrict access to the login page from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Test by injecting <script>alert('XSS')</script> into login_error parameter and checking if script executesCheck Version:
Check c3crm version in configuration files or admin interfaceVerify Fix Applied:
Attempt same XSS payload; script should not execute and input should be properly escaped📡 Detection & Monitoring
Log Indicators:
- Unusual login_error parameter values containing script tags or JavaScript
- Multiple failed login attempts with suspicious error messages
Network Indicators:
- HTTP requests to /Login.php with script payloads in parameters
- Unexpected redirects from login page
SIEM Query:
source="web_logs" AND uri_path="/Login.php" AND (param="login_error" AND value MATCHES "<script|javascript:")