Heap-based Buffer Overflow in RDK-B WebUI

Executive Summary

This is a heap-based buffer overflow in the multipart form-data parser of RDK-B WebUI. It occurs in the file jst_post.c and allows a remote unauthenticated attacker to corrupt memory and cause a denial of service. In severe cases, it may enable arbitrary code execution through specially crafted multipart/form-data requests.

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Detection Guidance

This vulnerability involves a heap-based buffer overflow in the multipart form-data parser in RDK-B WebUI. Detection requires inspecting network traffic for malformed multipart/form-data requests targeting the vulnerable component. Use packet capture tools like tcpdump or Wireshark to monitor and analyze incoming HTTP POST requests with multipart/form-data content types. Check server logs for segmentation faults or crashes in the WebUI process.

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Impact Analysis

An attacker could exploit this to crash the affected system, leading to service disruption. If code execution is achieved, they might gain control over the device, steal data, or perform other malicious actions depending on the system's role and configuration.

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Mitigation Strategies

Immediately update RDK-B WebUI to the latest patched version if available. If no patch exists, restrict access to the WebUI by blocking external traffic via firewall rules. Disable multipart/form-data parsing temporarily if feasible. Monitor system logs for signs of exploitation attempts. Consider isolating the WebUI server from critical systems until mitigation is confirmed.

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