Entity Expansion Vulnerability in svg_optimizer Ruby Gem

Executive Summary

The svg_optimizer gem before version 0.3.0 for Ruby has a vulnerability where it performs entity expansion on untrusted documents. This means it processes XML or HTML entities in files without proper validation, which can lead to security risks like XML External Entity (XXE) attacks if malicious entities are included in the input.

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Detection Guidance

Check if the svg_optimizer gem version is below 0.3.0 using the command: gem list svg_optimizer. If installed, verify if Nokogiri's noent parse option is enabled by default in your Ruby environment.

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Impact Analysis

If you use the svg_optimizer gem before version 0.3.0, an attacker could craft a malicious SVG or XML file that triggers entity expansion, potentially leading to unauthorized data access, denial of service, or other security breaches when processed by your application.

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Mitigation Strategies

Update the svg_optimizer gem to version 0.3.0 or higher using: gem update svg_optimizer. If using Nokogiri, ensure the noent parse option is not enabled by default and only use trusted: true for trusted documents.

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