How CVE-2025-23108 Works
This vulnerability in Firefox for iOS (< v134) allows malicious JavaScript links to spoof the URL of a new tab when opened via long-press. Attackers can craft a link that, when long-pressed, opens a new tab with a fake URL while executing arbitrary scripts. The browser fails to properly validate the displayed URL against the actual page content, enabling phishing attacks where users believe they are visiting a legitimate site.
DailyCVE Form
Platform: Firefox iOS
Version: < 134
Vulnerability: URL Spoofing
Severity: Medium
Date: 04/03/2025
What Undercode Say:
Exploitation Analysis
- Attackers inject malicious JavaScript via crafted links.
- Long-press triggers new tab with spoofed URL.
- User perceives fake domain as legitimate.
Detection Commands
grep -r "window.open" /path/to/firefox-ios/codebase
// Check for URL validation bypass
if (document.location.href !== window.opener.location.href) {
console.log("Possible spoofing detected");
}
Protection Measures
1. Update Firefox iOS to v134+.
2. Disable JavaScript execution for untrusted links.
3. Implement strict URL validation in new tabs.
Patch Verification Code
func validateURL(_ url: URL) -> Bool {
return url.absoluteString == webView.url?.absoluteString
}
Mitigation Script
// Force URL visibility check
window.addEventListener('load', () => {
if (window.opener && window.opener.location.host !== location.host) {
alert("Suspicious tab detected!");
}
});
Log Analysis
cat /var/log/firefox-ios/errors.log | grep "URL mismatch"
Exploit PoC (For Research Only)
<a href="javascript:window.open('https://evil.com','_blank');document.='Trusted Site'">Long-press me</a>
Secure Coding Practices
- Sanitize all user-controlled links.
- Enforce same-origin checks for new tabs.
- Audit all `window.open` calls.
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-23108
Extra Source Hub:
Undercode
