ACSE Layer Heap Buffer Overflow in MMS Connection

Executive Summary

This vulnerability exists in the ACSE layer during MMS connection setup. It involves incorrect handling of AARQ PDUs where attacker-controlled length values of zero or one cause the parser to read beyond the allocated heap buffer when processing fields in the calling AP title.

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Detection Guidance

Detection of this vulnerability requires monitoring MMS protocol traffic for malformed AARQ PDUs during connection establishment. Inspect network traffic for unusually short calling AP title fields or zero/one length values in AARQ PDUs. Use protocol analyzers like Wireshark with MMS dissector enabled to filter for MMS traffic anomalies.

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Impact Analysis

An attacker could exploit this to cause a denial of service by crashing the system or potentially execute arbitrary code on affected systems using MMS connections. This may disrupt industrial control systems or other critical infrastructure relying on MMS protocols.

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Compliance Impact

This vulnerability involves a heap buffer overflow in the ACSE layer during MMS connection establishment, which could lead to denial of service or potential code execution. Such flaws may impact compliance by compromising data integrity and availability, which are critical under GDPR and HIPAA. However, specific compliance impacts are not detailed in the provided context.

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Mitigation Strategies

Immediate mitigation steps include updating affected systems to the latest patched versions, monitoring network traffic for unusual MMS connection attempts, and restricting access to MMS services from untrusted networks.

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