How the CVE Works:
The vulnerability exists in Publify’s redirect functionality, where a publisher can inject malicious JavaScript via a crafted redirect URL. When an administrator views the redirect list in the admin panel, the payload is embedded in an `` tag. Clicking the link executes the JavaScript in the admin’s session, enabling XSS. Attackers may encode the payload to evade detection, potentially leading to session hijacking or privilege escalation.
DailyCVE Form:
Platform: Publify
Version:
Vulnerability: Stored XSS
Severity: Medium
Date: 2023-01-15
What Undercode Say:
Exploitation:
1. Craft malicious redirect:
javascript:fetch('/admin/privilege_escalate?user=attacker')
2. Encode payload:
// Hex-encoded example
jaVasCript:alert('XSS')
3. Admin interaction:
Victim clicks the link in the admin panel, triggering the exploit.
Protection:
1. Input sanitization:
$redirect_url = filter_var($_POST[bash], FILTER_SANITIZE_URL);
2. Content Security Policy (CSP):
Content-Security-Policy: default-src 'self'; script-src 'unsafe-inline' 'unsafe-eval'
3. Output encoding:
ERB::Util.html_escape(redirect.url)
Detection:
- Audit logs:
grep -r "javascript:" /var/log/publify/access.log
- Patch check:
bundle show publify | grep -i "fixed_version"
Mitigation:
1. Update to the latest Publify version.
2. Restrict publisher permissions for redirect creation.
3. Implement clickjacking protection headers:
X-Frame-Options: DENY
References:
- Publify advisory: GHSA-xxxx-xxxx-xxxx
- OWASP XSS Cheat Sheet
References:
Reported By: https://github.com/advisories/GHSA-8fm5-gg2f-f66q
Extra Source Hub:
Undercode
