CVE-2025-26320
📋 TL;DR
CVE-2025-26320 is an OS command injection vulnerability in t0mer BroadlinkManager v5.9.1 that allows attackers to execute arbitrary commands on the host system by injecting malicious input into the IP Address parameter at the /device/ping endpoint. This affects anyone running the vulnerable version of BroadlinkManager, particularly in Docker deployments.
💻 Affected Systems
- t0mer BroadlinkManager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise leading to complete host takeover, data exfiltration, lateral movement, and persistent backdoor installation.
Likely Case
Unauthorized command execution with the privileges of the BroadlinkManager process, potentially leading to service disruption, data access, or further exploitation.
If Mitigated
Limited impact if proper network segmentation, least privilege, and input validation are implemented.
🎯 Exploit Status
Exploitation is straightforward via crafted HTTP requests to the vulnerable endpoint; proof-of-concept code is available in the GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch exists; apply workarounds or discontinue use of the vulnerable version.
🔧 Temporary Workarounds
Input Validation and Sanitization
allModify the BroadlinkManager code to validate and sanitize the IP address parameter before passing it to system commands.
Edit broadlinkmanager.py lines 639-657 to implement proper input validation (e.g., using regex or IP address libraries).
Network Access Restriction
linuxRestrict network access to the BroadlinkManager service to trusted IPs only.
iptables -A INPUT -p tcp --dport [PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [PORT] -j DROP
🧯 If You Can't Patch
- Isolate the BroadlinkManager instance in a dedicated network segment with strict firewall rules.
- Run BroadlinkManager with minimal privileges (e.g., as a non-root user) to limit potential damage.
🔍 How to Verify
Check if Vulnerable:
Check if BroadlinkManager v5.9.1 is running and accessible; test by sending a crafted request to /device/ping with a malicious IP parameter (e.g., '127.0.0.1; whoami').Check Version:
docker exec [CONTAINER_NAME] python -c "import broadlinkmanager; print(broadlinkmanager.__version__)" or check the Docker image tag.Verify Fix Applied:
Verify that input validation is in place by testing with malicious inputs and ensuring no command execution occurs.📡 Detection & Monitoring
Log Indicators:
- Unusual commands in system logs from the BroadlinkManager process
- HTTP requests to /device/ping with suspicious IP parameters
Network Indicators:
- Unexpected outbound connections from the BroadlinkManager host
- Traffic to /device/ping endpoint with shell metacharacters
SIEM Query:
source="broadlinkmanager.log" AND (url="/device/ping" AND ip_address MATCHES "[;|&$()]" )