Heap Out-of-Bounds Read in MongoDB BSON Parser

Executive Summary

This vulnerability involves a missing bounds check in the BSON CodeWScope element accessors. An attacker can exploit it by creating a malformed BSONColumn data with a CodeWScope element, bypassing wire-level BSON validation. When decompressed, the unchecked size value leads to out-of-bounds heap read, causing server crashes or exposing adjacent heap memory.

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Impact Analysis

An attacker could crash the server or read sensitive memory contents. This may lead to denial of service, information disclosure, or potential further exploitation depending on the exposed data.

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Compliance Impact

This vulnerability could lead to unauthorized data access or disclosure, violating GDPR's data protection principles and HIPAA's confidentiality requirements. Organizations may face compliance breaches, legal penalties, and reputational damage if exploited.

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Mitigation Strategies

Update MongoDB to the latest patched version immediately to address the missing bounds check in BSON CodeWScope element accessors. Ensure wire-level BSON validation is enforced and restrict authenticated user access to trusted sources only.

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