Out-of-Bounds Read in MongoDB PHP Driver BSON Decoding

Executive Summary

This vulnerability is an out-of-bounds read in the BSON decoding component of the MongoDB PHP driver. It allows an unauthenticated attacker to supply specially crafted input that causes a small amount of adjacent process memory to be copied into an error message returned to the application. This could lead to unintended disclosure of limited memory contents.

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Detection Guidance

This vulnerability involves an out-of-bounds read in the MongoDB PHP driver's BSON decoding. Detection requires checking the version of the MongoDB PHP driver in use. Use the command 'php -r "echo phpversion('mongodb');"' to verify the installed version. If it is older than the patched version, the system is likely vulnerable.

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Impact Analysis

The impact includes potential exposure of sensitive memory contents through error messages. While the disclosed memory is limited, it could reveal partial data such as configuration details, session tokens, or other sensitive information depending on the application's memory state.

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Compliance Impact

This vulnerability could lead to unintended disclosure of sensitive data, which may violate compliance requirements under GDPR (data protection) or HIPAA (health information privacy). Organizations must assess whether this exposure risks unauthorized access to regulated data.

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Mitigation Strategies

Immediately update the MongoDB PHP driver to the latest patched version. Disable any unnecessary PHP applications using the MongoDB driver if immediate updates are not feasible. Monitor error logs for unusual memory disclosure patterns in BSON decoding operations.

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