CVE-2025-0513
📋 TL;DR
CVE-2025-0513 is a cross-site scripting (XSS) vulnerability in Octopus Server where unsafe handling of error messages allows attackers to inject malicious code. This affects users viewing error pages in vulnerable Octopus Server versions. Attackers could execute arbitrary JavaScript in victims' browsers.
💻 Affected Systems
- Octopus Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, or redirect to malicious sites, potentially leading to full account compromise.
Likely Case
Attackers could perform session hijacking, credential theft, or deface error pages with malicious content.
If Mitigated
With proper input validation and output encoding, the risk is limited to error page content manipulation only.
🎯 Exploit Status
Exploitation requires attacker to control error message content, which could occur through various input vectors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024.4.0 and later
Vendor Advisory: https://advisories.octopus.com/post/2024/sa2025-04/
Restart Required: Yes
Instructions:
1. Download Octopus Server 2024.4.0 or later from official sources
2. Run the installer/upgrade package
3. Follow upgrade wizard instructions
4. Restart Octopus Server service
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement strict input validation on all user-controllable fields that could appear in error messages
Content Security Policy
allImplement strict Content Security Policy headers to limit script execution
🧯 If You Can't Patch
- Restrict access to Octopus Server to trusted networks only
- Implement web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check Octopus Server version via web interface or configuration filesCheck Version:
Check Octopus Server web interface dashboard or configuration files for version informationVerify Fix Applied:
Verify version is 2024.4.0 or later and test error page functionality📡 Detection & Monitoring
Log Indicators:
- Unusual error messages containing script tags or JavaScript
- Multiple error page requests with suspicious parameters
Network Indicators:
- HTTP requests with script payloads in error-related parameters
SIEM Query:
source="octopus" AND (message="error" AND (message="script" OR message="javascript" OR message="<script>"))