Executive Summary

CVE-2018-25155 is a Cross-Site Request Forgery (CSRF) vulnerability in the Teradek Slice firmware version 7.3.15. It allows attackers to change administrative passwords without proper request validation. Specifically, if a logged-in user visits a malicious web page crafted by an attacker, that page can automatically submit password change requests to the device's web interface, changing the admin password without the user's consent. [1, 3]

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Impact Analysis

This vulnerability can allow an attacker to take control of the Teradek Slice device by changing the administrator password remotely without authorization. This could lead to unauthorized administrative access, potentially disrupting device operation, compromising broadcast streams, or allowing further malicious actions on the device or network. [1, 3]

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Detection Guidance

This vulnerability can be detected by monitoring HTTP requests to the Teradek Slice device's web interface, especially on port 8090, for unauthorized or suspicious password change requests. Since the vulnerability involves CSRF via crafted HTTP requests, checking web server logs (lighttpd versions 1.4.31 and 1.4.48) for POST requests that change administrative passwords without proper validation is key. Specific commands could include using network traffic analysis tools like tcpdump or Wireshark to capture HTTP traffic on port 8090, and grep or similar tools to search logs for password change requests. For example, on the device or a proxy, you might run: `tcpdump -i any port 8090 -w capture.pcap` and then analyze the capture for suspicious POST requests. Additionally, reviewing lighttpd access logs for POST requests to password change endpoints can help detect exploitation attempts. [1, 3]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the Teradek Slice web interface (port 8090) to trusted networks or IP addresses, disabling web interface access from untrusted networks, and educating users to avoid visiting untrusted or suspicious websites while logged into the device. Since the vulnerability is a CSRF flaw allowing password changes without validation, implementing network-level controls such as firewall rules to limit access and monitoring for unusual administrative changes is important. If possible, update the firmware to a version that addresses this vulnerability or apply vendor-provided patches. If no patch is available, consider isolating the device from general network access until a fix is applied. [1, 3]

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