Executive Summary

This vulnerability exists in ThinkPHP version 5.0.23 and allows remote attackers to execute arbitrary PHP code without authentication. It occurs because attackers can manipulate the routing parameter to invoke functions, enabling them to run system commands with the same privileges as the application by sending crafted requests to the index.php endpoint.

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Impact Analysis

The impact of this vulnerability is severe as it allows unauthenticated remote attackers to execute arbitrary code on the affected system. This can lead to full system compromise, data theft, data loss, service disruption, or the attacker gaining control over the application and potentially the underlying server.

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Compliance Impact

CVE-2018-25270 is a critical remote code execution vulnerability that allows unauthenticated attackers to execute arbitrary PHP code with application privileges. This can lead to unauthorized access, data breaches, and manipulation of sensitive information.

Such unauthorized access and potential data compromise can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data against unauthorized access and breaches.

Organizations using vulnerable versions of ThinkPHP may face increased risk of non-compliance due to the possibility of data exposure or system compromise resulting from this vulnerability.

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Detection Guidance

This vulnerability can be detected by sending crafted HTTP requests to the vulnerable ThinkPHP application's index.php endpoint, specifically targeting the invokefunction mechanism.

A typical detection command involves using curl or similar HTTP clients to send a request that attempts to execute a harmless command such as phpinfo() to verify if remote code execution is possible.

• curl "http://server/public/index.php?s=/index/\think\app/invokefunction&function=call_user_func_array&vars[0]=system&vars[1][]=php -r 'phpinfo();'"

If the response contains PHP information output, it confirms the presence of the vulnerability.

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Mitigation Strategies

Immediate mitigation steps include applying proper input validation and authorization checks on the routing parameters to prevent unauthorized invocation of functions.

Updating ThinkPHP to a version later than 5.0.23 or 5.1.31 where this vulnerability is fixed is strongly recommended.

Additionally, restricting access to the index.php endpoint or disabling the invokefunction mechanism if not needed can reduce the attack surface.

Monitoring and blocking suspicious requests that attempt to exploit the invokefunction parameter can also help mitigate exploitation attempts.

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