Remote Code Execution in Squirro Cognitive Search

Executive Summary

This vulnerability is a server-side template injection (SSTI) flaw in Squirro Cognitive Search versions before 3.14.2. It allows a remote attacker to execute arbitrary code by injecting a malicious payload into the password reset or email notification template. The issue occurs because the application uses Jinja2 templates, which can be manipulated to access Python's built-in functions and execute system commands.

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Detection Guidance

To detect this vulnerability, check if your Squirro Cognitive Search version is below 3.14.2. Inspect email templates for suspicious Jinja2 payloads like {{self._TemplateReference__context.cycler.__init__.__globals__.os.popen(...).read()}}. Monitor for unexpected system command execution during email processing.

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Impact Analysis

An attacker could exploit this to run arbitrary commands on the server hosting Squirro Cognitive Search. This could lead to unauthorized access, data theft, or further compromise of the system. The impact includes potential loss of sensitive data, system integrity breaches, and disruption of services.

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Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations using affected versions may face compliance violations, legal penalties, and reputational damage due to potential data breaches.

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Mitigation Strategies

Upgrade Squirro Cognitive Search to version 3.14.2 or later immediately. Review and sanitize all email templates to remove any Jinja2 payloads. Restrict access to the password reset function and email template editing to authorized personnel only.

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