^{CVE-2020-6841:}Command Injection Vulnerability in D-Link DCH-M225 Audio Extender

Overview

The D-Link DCH-M225 Audio Extender contains a critical command injection vulnerability that affects firmware version 1.05b01 and earlier. The vulnerability exists in the spotifyConnect.php script, which improperly sanitizes user input in the userName parameter. An attacker can exploit this vulnerability by sending specially crafted requests containing shell metacharacters to the affected device, resulting in arbitrary command execution with the privileges of the web server process. This vulnerability could allow attackers to gain unauthorized access to the device, extract sensitive information, modify system configurations, or use the compromised device as an entry point to attack other systems on the network.

Remediation

1. Update firmware: D-Link has released a security patch to address this vulnerability. Users should immediately update their DCH-M225 devices to the latest firmware version available through the D-Link support website.
2. Network isolation: Until patches can be applied, isolate vulnerable devices on a separate network segment with restricted access.
3. Access control: Implement strong access controls to limit who can connect to the device.
4. Firewall configuration: Configure network firewalls to restrict access to the management interfaces of these devices.
5. Monitor for suspicious activity: Regularly check device logs for any signs of unauthorized access or unusual behavior.
6. Consider replacement: If updates are not available for your specific model, consider replacing the device with a supported alternative.

References

1. D-Link Security Advisory: https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10152
2. Exploit Details: https://gist.github.com/jezzaaa/38c752d0a129576b2cc523ce6325050f
3. CWE-78: OS Command Injection: https://cwe.mitre.org/data/definitions/78.html
4. MITRE CVE Entry: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6841