OpenSSL Encrypt JSON Schema Validation Bypass

Executive Summary

This vulnerability affects openssl_encrypt versions before 1.4.0. When the jsonschema library is missing, the system silently skips JSON schema validation instead of enforcing it. Attackers can exploit this by removing the jsonschema package or using unknown metadata formats to bypass security checks and process malicious data.

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Detection Guidance

Check if the jsonschema library is installed alongside openssl_encrypt versions before 1.4.0. Run commands like 'pip show jsonschema' or 'composer show' to verify dependencies. Inspect application logs for warnings about missing jsonschema library during openssl_encrypt operations.

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Impact Analysis

This flaw allows attackers to bypass security checks and process malicious data, potentially leading to unauthorized access, data corruption, or other harmful actions. Systems relying on openssl_encrypt for data validation are at risk if they use versions prior to 1.4.0.

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Compliance Impact

This vulnerability could lead to non-compliance with GDPR and HIPAA by allowing unauthorized processing or exposure of sensitive data due to skipped JSON schema validation. Malicious data could bypass security checks, potentially violating data integrity and confidentiality requirements.

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Mitigation Strategies

Upgrade openssl_encrypt to version 1.4.0 or later. Ensure jsonschema is installed as a mandatory dependency. Modify schemas to set 'additionalProperties: false' to reject unknown fields. Implement fail-closed behavior if validation libraries are missing.

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