CVE-2025-8527
📋 TL;DR
This critical vulnerability in Exrick xboot allows remote attackers to perform server-side request forgery (SSRF) attacks by manipulating the loginUrl parameter in the Swagger component. It affects all systems running xboot versions up to 3.3.4. Attackers can potentially access internal network resources or services through the vulnerable application.
💻 Affected Systems
- Exrick xboot
📦 What is this software?
Xboot by Exrick
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, exfiltrate sensitive data, or pivot to other internal systems by making requests to internal network resources through the vulnerable server.
Likely Case
Attackers scan and access internal services, potentially exposing internal APIs, databases, or administrative interfaces that shouldn't be publicly accessible.
If Mitigated
With proper network segmentation and input validation, impact is limited to the application server's network context with no access to critical internal resources.
🎯 Exploit Status
Exploit details have been publicly disclosed on GitHub. Attack requires manipulation of the loginUrl parameter in Swagger endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.3.5 or later
Vendor Advisory: https://github.com/Exrick/xboot/issues/70
Restart Required: No
Instructions:
1. Update to xboot version 3.3.5 or later. 2. Verify the SecurityController.java file has proper input validation for the loginUrl parameter. 3. Test Swagger functionality after update.
🔧 Temporary Workarounds
Disable Swagger in production
allDisable Swagger UI/API documentation endpoints in production environments
springfox.swagger.enabled=false
springdoc.api-docs.enabled=false
Input validation filter
allImplement request filtering to validate and sanitize loginUrl parameter
🧯 If You Can't Patch
- Implement network segmentation to restrict the application server's outbound network access
- Deploy a WAF with SSRF protection rules to block malicious loginUrl parameters
🔍 How to Verify
Check if Vulnerable:
Check if running xboot version 3.3.4 or earlier and Swagger is enabled. Review SecurityController.java for lack of loginUrl validation.Check Version:
Check pom.xml for <version> tag or application properties for xboot versionVerify Fix Applied:
Verify version is 3.3.5 or later. Test Swagger endpoints with malicious loginUrl values to confirm they're rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual requests to Swagger endpoints with external URLs in parameters
- Outbound requests from application server to internal IP ranges
Network Indicators:
- Application server making unexpected outbound HTTP requests
- Requests to internal services from application server IP
SIEM Query:
source="application-server" AND (url_contains("swagger") OR url_contains("api-docs")) AND (parameter_contains("http://") OR parameter_contains("://10.") OR parameter_contains("://192.168."))