CVE-2024-25676
📋 TL;DR
ViewerJS 0.5.8 contains an open redirection and out-of-band resource loading vulnerability due to improper URL sanitization in URL TAGs. This allows attackers to redirect users to malicious sites or load external resources without proper validation. Any system running the vulnerable ViewerJS version is affected.
💻 Affected Systems
- ViewerJS
⚠️ 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 redirect users to phishing sites, steal credentials via open redirection, or load malicious resources that could lead to further exploitation.
Likely Case
Open redirection attacks where users are tricked into visiting malicious websites, potentially leading to credential theft or malware distribution.
If Mitigated
Limited impact with proper input validation and URL filtering in place, preventing malicious redirects and resource loading.
🎯 Exploit Status
Exploitation requires user interaction (clicking a malicious link) but doesn't require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.5.9 or later
Vendor Advisory: https://cds.thalesgroup.com/en/tcs-cert/CVE-2024-25676
Restart Required: No
Instructions:
1. Upgrade ViewerJS to version 0.5.9 or later. 2. Replace all files with the updated version. 3. Clear any cached files or resources.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side URL validation to block malicious redirects and external resource loading.
Content Security Policy
allImplement strict CSP headers to restrict resource loading to trusted sources only.
🧯 If You Can't Patch
- Implement network-level URL filtering to block malicious domains and redirects.
- Use web application firewalls (WAF) with open redirection protection rules.
🔍 How to Verify
Check if Vulnerable:
Check the ViewerJS version in use. If it's 0.5.8, the system is vulnerable.Check Version:
Check the ViewerJS documentation or package files for version information.Verify Fix Applied:
Verify that ViewerJS has been updated to version 0.5.9 or later and test URL loading functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual redirect patterns in web server logs
- Requests to unexpected external domains from ViewerJS
Network Indicators:
- HTTP redirects to suspicious domains
- Unexpected outbound connections from ViewerJS instances
SIEM Query:
source="web_server" AND (url="*redirect=*" OR url="*url=*") AND status=302