CVE-2018-8488 in SharePoint Enterprise Server
Summary
by MITRE
An elevation of privilege vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server, aka "Microsoft SharePoint Elevation of Privilege Vulnerability." This affects Microsoft SharePoint. This CVE ID is unique from CVE-2018-8480, CVE-2018-8498, CVE-2018-8518.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 05/23/2023
The vulnerability described in CVE-2018-8488 represents a critical elevation of privilege flaw within Microsoft SharePoint Server that stems from inadequate input validation mechanisms. This weakness allows attackers to craft malicious web requests that can bypass normal security restrictions and escalate their privileges within the SharePoint environment. The vulnerability specifically manifests when the affected server fails to properly sanitize incoming web requests, creating an attack vector that could enable unauthorized users to gain higher-level permissions than initially granted. Such a flaw poses significant risks to organizations relying on SharePoint for document management, collaboration, and enterprise content management services.
The technical nature of this vulnerability aligns with CWE-20, which describes improper input validation as a fundamental weakness in software security. When SharePoint Server processes web requests without adequate sanitization, it creates opportunities for attackers to inject malicious content that can manipulate the server's behavior. This particular flaw operates at the application layer where HTTP requests are processed, making it particularly dangerous as it can be exploited through standard web-based attack methods. The vulnerability's exploitation typically involves crafting specific HTTP requests that contain malicious payloads designed to manipulate the SharePoint server's authentication and authorization mechanisms.
From an operational standpoint, this elevation of privilege vulnerability could have severe consequences for organizations using SharePoint Server. Attackers who successfully exploit this flaw could gain administrative privileges or access to sensitive documents and data that should be restricted to authorized personnel only. The impact extends beyond simple data access as the elevated privileges could enable attackers to modify or delete critical content, install malicious software, or establish persistent access within the organization's network. The vulnerability affects SharePoint Server versions that fail to implement proper request sanitization, potentially compromising entire SharePoint farms and the data they contain. Organizations with extensive SharePoint deployments face heightened risk as this vulnerability could be leveraged to compromise multiple systems within a single attack.
Security professionals should implement several mitigation strategies to address this vulnerability effectively. The primary recommendation involves applying the official Microsoft security patches released for this CVE, which typically include code modifications that enhance input validation and request sanitization within the SharePoint Server environment. Network segmentation and firewall rules can help limit exposure by restricting direct access to SharePoint servers from untrusted networks. Additionally, implementing robust web application firewalls and monitoring for suspicious web requests can provide additional layers of defense. Organizations should also conduct thorough security assessments to identify any potential exploitation attempts and ensure that proper access controls and least privilege principles are maintained across their SharePoint environments. The ATT&CK framework categorizes this type of vulnerability under privilege escalation techniques, specifically targeting the 'Exploitation for Privilege Escalation' tactic, making it particularly concerning for organizations that rely on SharePoint Server for enterprise collaboration and content management.