Executive Summary

This vulnerability is a Denial of Service (DoS) issue in evershop version 2.1.0 and earlier. It allows unauthenticated attackers to exhaust the application server's resources by exploiting the "GET /images" API. The problem arises because the application does not limit the height of the use-element shadow tree or the dimensions of pattern tiles when processing SVG files, which leads to unbounded resource consumption and ultimately causes a system-wide denial of service.

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Impact Analysis

The vulnerability can impact you by causing a denial of service on the evershop application server. An attacker can exploit this flaw to consume excessive server resources, potentially making the application unavailable to legitimate users and disrupting business operations.

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Detection Guidance

This vulnerability can be detected by monitoring for unusual or excessive requests to the "GET /images" API endpoint of evershop 2.1.0 and prior. You can use network monitoring tools or web server logs to identify repeated or high-volume GET requests to /images. Additionally, checking for high resource consumption or server slowdowns when processing SVG files may indicate exploitation attempts. Specific commands depend on your environment, but examples include using curl to simulate requests: `curl -v http://your-evershop-server/images` or using tools like tcpdump or Wireshark to capture and analyze traffic targeting the /images endpoint.

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Mitigation Strategies

Immediate mitigation steps include restricting or rate-limiting access to the "GET /images" API endpoint to prevent resource exhaustion. Applying input validation or filtering to limit the height of the use-element shadow tree and the dimensions of pattern tiles in SVG files can help. If possible, upgrade to a version of evershop that addresses this vulnerability once available. In the meantime, consider deploying web application firewalls (WAF) rules to block or throttle suspicious requests targeting the /images endpoint.

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