CVE-2023-53887
📋 TL;DR
Zomplog 3.9 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious JavaScript when creating new pages. Attackers can craft malicious image attributes to execute arbitrary code in victims' browsers, potentially compromising user sessions or stealing sensitive data. This affects all Zomplog 3.9 installations with authenticated user access.
💻 Affected Systems
- Zomplog
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, hijack user sessions, deface websites, or redirect users to malicious sites, potentially leading to complete system compromise if combined with other vulnerabilities.
Likely Case
Authenticated attackers with malicious intent could steal session cookies, perform actions on behalf of other users, or deface the website by injecting malicious content visible to all visitors.
If Mitigated
With proper input validation and output encoding, the risk is limited to authenticated users who would need to bypass additional security controls to exploit the vulnerability.
🎯 Exploit Status
Exploit code is publicly available on Exploit-DB (ID 51625). The vulnerability requires authenticated access but exploitation is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a different blogging platform or implementing workarounds.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement server-side input validation and output encoding for all user-controlled data in page creation functionality.
Manual code review and modification of Zomplog source files to sanitize user input
Content Security Policy (CSP)
allImplement a strict Content Security Policy to prevent execution of inline JavaScript and restrict script sources.
Add Content-Security-Policy header to web server configuration
🧯 If You Can't Patch
- Disable page creation functionality for non-administrative users
- Implement web application firewall (WAF) rules to block XSS payloads in page content
🔍 How to Verify
Check if Vulnerable:
Check if running Zomplog version 3.9. Attempt to create a page with malicious image attributes like <img src=x onerror=alert(1)> and see if JavaScript executes.Check Version:
Check Zomplog configuration files or admin interface for version informationVerify Fix Applied:
Test page creation with the same malicious payloads after implementing workarounds to ensure JavaScript does not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual page creation activity
- Requests containing suspicious JavaScript or HTML attributes in page content
Network Indicators:
- HTTP requests with malicious script payloads in POST data to page creation endpoints
SIEM Query:
source="web_logs" AND (uri_path="/admin/create_page" OR uri_path="/admin/page") AND (http_method="POST") AND (request_body MATCHES "onerror|javascript:|<script>|<img.*onerror")