Deserialization of Untrusted Data in Microsoft Office SharePoint

Executive Summary

This vulnerability involves deserialization of untrusted data in Microsoft Office SharePoint. An authorized attacker can exploit this to execute arbitrary code remotely over a network.

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Detection Guidance

Detection requires monitoring for unusual deserialization activity in Microsoft Office SharePoint. Check SharePoint logs for unexpected code execution attempts or network traffic anomalies. Use tools like Microsoft Defender for Office 365 to scan for suspicious deserialization patterns.

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Impact Analysis

An attacker could gain control of your SharePoint server, steal data, install malware, or disrupt services. This requires the attacker to have authorized access but could lead to severe system compromise.

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Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR (data protection) and HIPAA (health data privacy). Organizations may face fines or legal penalties for non-compliance.

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Mitigation Strategies

Apply the latest security updates from Microsoft for SharePoint as soon as possible to patch the deserialization flaw. Monitor Microsoft's advisory for additional mitigation guidance and restrict network access to SharePoint servers until patched.

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