CVE-2021-24066 in SharePoint
Summary
by MITRE • 02/26/2021
Microsoft SharePoint Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 02/26/2021
Microsoft SharePoint represents a critical collaboration platform widely deployed across enterprise environments, serving as a central hub for document management, workflow automation, and team collaboration. The platform's extensive functionality and integration capabilities make it an attractive target for cyber adversaries seeking to establish persistent access within organizational networks. When vulnerabilities exist within SharePoint's core components, they can potentially enable attackers to execute arbitrary code on affected systems with elevated privileges, fundamentally compromising the security posture of organizations that rely on these platforms for business-critical operations.
The remote code execution vulnerability in Microsoft SharePoint stems from insufficient validation of user-supplied input within specific web application components. Attackers can exploit this flaw by crafting malicious requests that bypass authentication mechanisms and directly invoke vulnerable code paths within the SharePoint infrastructure. This technical weakness manifests through improper handling of serialized data or untrusted input parameters that are processed without adequate sanitization or validation checks, creating pathways for arbitrary code execution on the target server. The vulnerability typically exists in components responsible for processing file uploads, handling web services requests, or managing user-generated content within the SharePoint environment.
The operational impact of this vulnerability extends beyond simple unauthorized access, as successful exploitation can lead to complete system compromise and data exfiltration. Attackers leveraging this remote code execution capability can establish persistent backdoors, deploy additional malware payloads, escalate privileges to system-level access, and move laterally throughout the network infrastructure. Organizations relying on SharePoint for document storage, collaboration, and business processes face significant risks including intellectual property theft, regulatory compliance violations, and substantial financial losses due to operational disruption. The vulnerability's remote nature means attackers can exploit it from anywhere on the internet without requiring physical access or prior authentication credentials.
Mitigation strategies should focus on immediate patch deployment through Microsoft security updates, implementing network segmentation to isolate SharePoint servers from critical infrastructure, and establishing robust monitoring systems to detect anomalous behavior patterns. Organizations must also enforce principle of least privilege access controls, regularly audit user permissions, and implement web application firewalls to filter malicious requests before they reach vulnerable SharePoint components. Security teams should conduct comprehensive vulnerability assessments targeting SharePoint installations, review existing security configurations, and establish incident response procedures specifically tailored to address remote code execution threats in collaboration platforms. Compliance with industry standards such as those outlined in the CWE dictionary for code execution vulnerabilities and ATT&CK framework's execution techniques provides essential guidance for developing effective defensive measures against these sophisticated attack vectors.