CVE-2023-48250
📋 TL;DR
This vulnerability allows remote attackers to authenticate to affected Bosch web applications using hidden hard-coded accounts with high privileges. Any organization using vulnerable Bosch products with web interfaces is affected. Attackers can gain unauthorized administrative access without needing legitimate credentials.
💻 Affected Systems
- Bosch Building Integration System (BIS) with web interface
📦 What is this software?
Nexo Os by Bosch
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the web application with administrative privileges, allowing data theft, system manipulation, and potential lateral movement to other systems.
Likely Case
Unauthorized access to sensitive data and configuration settings, potentially leading to data exfiltration or system disruption.
If Mitigated
Limited impact if network segmentation, strong authentication controls, and monitoring are in place to detect unauthorized access attempts.
🎯 Exploit Status
Exploitation requires knowledge of the hard-coded credentials but no special tools or advanced skills. The vulnerability is authentication bypass through known credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Bosch security advisory for specific patched versions
Vendor Advisory: https://psirt.bosch.com/security-advisories/BOSCH-SA-711465.html
Restart Required: Yes
Instructions:
1. Review Bosch security advisory BOSCH-SA-711465. 2. Identify affected product versions. 3. Apply the vendor-provided patch or update to the fixed version. 4. Restart the application/service. 5. Verify the fix by testing authentication.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to the web interface to only trusted IP addresses or networks
Use firewall rules to limit access (e.g., iptables -A INPUT -p tcp --dport [web_port] -s [trusted_ip] -j ACCEPT)
Disable Web Interface
allTemporarily disable the web interface if not required for operations
Consult product documentation for web interface disable procedure
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems from untrusted networks
- Enable detailed authentication logging and monitor for unauthorized access attempts using the hard-coded accounts
🔍 How to Verify
Check if Vulnerable:
Attempt to authenticate to the web application using known hard-coded credentials (specific credentials not disclosed in public advisory). Check system logs for authentication attempts with suspicious accounts.Check Version:
Check web interface version through admin panel or consult product documentation for version query commandsVerify Fix Applied:
After patching, verify that hard-coded accounts no longer provide authentication. Test with legitimate credentials only.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful logins from unexpected accounts
- Authentication events from hard-coded account names (specific names not publicly disclosed)
Network Indicators:
- Unusual authentication traffic patterns to web interface
- Access from unexpected IP addresses to administrative endpoints
SIEM Query:
source="web_logs" AND (event_type="authentication_success" AND user IN ["hardcoded_account1", "hardcoded_account2"])