Heap Buffer Overflow in MMS BER Decoder

Executive Summary

The MMS BER decoder has a flaw where attacker-supplied length values for fixed-width BER fields (boolean/integer) are not validated. This causes the decoder to read past the end of a heap buffer, leading to termination of the MMS service process and a denial-of-service condition.

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Detection Guidance

This vulnerability involves a flaw in MMS BER decoder where attacker-supplied length values cause buffer over-reads. Detection requires monitoring for unexpected MMS service terminations or crashes. Check logs for service process crashes related to MMS decoding. Use network monitoring tools to inspect MMS traffic for malformed BER-encoded fields. Validate if your MMS implementation uses a vulnerable decoder version.

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Impact Analysis

An attacker could exploit this vulnerability to crash the MMS service, causing a denial-of-service. This disrupts communication services relying on MMS, potentially leading to service unavailability for users.

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Compliance Impact

This vulnerability causes a denial-of-service condition by crashing the MMS service process, which could disrupt critical operations. For GDPR, this may impact availability of personal data processing systems, potentially violating Article 32 requirements for resilience. For HIPAA, service disruption could affect covered entities' ability to maintain access to protected health information, potentially compromising the Security Rule's integrity and availability requirements.

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Mitigation Strategies

Apply vendor patches or updates for the MMS BER decoder component to fix the length validation flaw. Monitor MMS service processes for unexpected terminations and implement network segmentation to limit exposure. Disable MMS services if not required.

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