CVE-2023-36764 in SharePoint Server
Summary
by MITRE • 09/12/2023
Microsoft SharePoint Server Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 10/10/2023
This vulnerability represents a critical elevation of privilege flaw in Microsoft SharePoint Server that allows authenticated attackers to escalate their privileges within the system. The vulnerability stems from improper validation of user permissions and access controls within the SharePoint authorization framework, creating a pathway for malicious actors to gain higher-level system access than initially granted. According to CWE-284, this issue falls under inadequate access control mechanisms where the system fails to properly enforce authorization checks during critical operations.
The technical implementation of this vulnerability involves a flaw in how SharePoint Server handles permission validation when processing certain administrative requests and API calls. Attackers can exploit this weakness by crafting specific requests that bypass normal access controls, effectively allowing them to perform actions typically restricted to administrators or users with higher privileges. The vulnerability specifically impacts the way SharePoint validates user credentials and session tokens during privilege escalation scenarios, particularly affecting the server-side validation logic that should prevent unauthorized access to sensitive administrative functions.
The operational impact of this vulnerability extends beyond simple privilege escalation, potentially enabling attackers to gain full administrative control over SharePoint environments. Once exploited, attackers can manipulate content, modify user permissions, access confidential data, and potentially establish persistent backdoors within the organization's SharePoint infrastructure. This vulnerability affects organizations relying on SharePoint Server for document management, collaboration, and enterprise content management services, making it particularly dangerous in environments where SharePoint serves as a central hub for business-critical information.
Organizations should implement immediate mitigations including applying the latest security patches from Microsoft, reviewing and tightening SharePoint permission settings, implementing network segmentation to limit access to SharePoint servers, and monitoring for suspicious authentication patterns. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques where adversaries leverage system flaws to gain elevated access rights. Security teams should also consider implementing additional controls such as multi-factor authentication, regular security assessments, and enhanced logging of administrative activities to detect potential exploitation attempts and maintain comprehensive audit trails for forensic analysis purposes.
Microsoft has released security updates addressing this vulnerability through their regular patching cycle, emphasizing the importance of maintaining up-to-date security measures. Organizations should also conduct thorough risk assessments to identify all SharePoint Server installations and ensure proper patch management protocols are in place across their entire infrastructure. The vulnerability demonstrates the critical need for robust access control mechanisms and continuous security monitoring in enterprise collaboration platforms that handle sensitive organizational data and user credentials.