CVE-2022-38053: SharePoint Enterprise Server RCE Flaw

CVE-2022-38053 Overview

CVE-2022-38053 is a Remote Code Execution (RCE) vulnerability affecting Microsoft SharePoint Server. This vulnerability allows an authenticated attacker with network access to execute arbitrary code on the target SharePoint server with elevated privileges. The vulnerability stems from improper input validation within SharePoint's processing components, potentially enabling attackers to compromise enterprise collaboration environments and gain unauthorized access to sensitive organizational data.

Critical Impact

Authenticated attackers can achieve remote code execution on affected SharePoint servers, potentially leading to complete system compromise, data exfiltration, and lateral movement within enterprise networks.

Affected Products

• Microsoft SharePoint Enterprise Server 2013 SP1
• Microsoft SharePoint Enterprise Server 2016
• Microsoft SharePoint Foundation 2013 SP1
• Microsoft SharePoint Server 2019
• Microsoft SharePoint Server Subscription Edition

Discovery Timeline

• October 11, 2022 - CVE-2022-38053 published to NVD
• January 2, 2025 - Last updated in NVD database

Technical Details for CVE-2022-38053

Vulnerability Analysis

This Remote Code Execution vulnerability in Microsoft SharePoint Server allows authenticated attackers to execute arbitrary code within the context of the SharePoint application pool identity. The vulnerability requires network access and valid authentication credentials, but does not require user interaction to exploit. Successful exploitation can result in complete compromise of confidentiality, integrity, and availability of the affected SharePoint server and its hosted data.

SharePoint servers often serve as central repositories for enterprise documents and collaboration, making this vulnerability particularly concerning for organizations. An attacker who successfully exploits this vulnerability could access sensitive documents, modify content, deploy malware, or use the compromised server as a pivot point for further attacks within the network.

Root Cause

The vulnerability exists due to improper handling of specially crafted input within Microsoft SharePoint Server. While Microsoft has not disclosed specific technical details about the root cause to prevent exploitation, the vulnerability classification as Remote Code Execution indicates that the server fails to properly validate or sanitize certain input data, allowing malicious payloads to be processed and executed.

Attack Vector

The attack vector for CVE-2022-38053 is network-based, requiring the attacker to have authenticated access to the SharePoint environment. The exploitation process involves:

1. The attacker authenticates to the vulnerable SharePoint server with valid credentials (even low-privileged accounts)
2. A specially crafted request is sent to the SharePoint server
3. The malicious payload bypasses input validation mechanisms
4. Code execution occurs within the context of the SharePoint application pool

The vulnerability does not require any user interaction beyond the initial authentication, and the attacker can target the server directly over the network. For detailed technical information, refer to the Microsoft Security Update Guide.

Detection Methods for CVE-2022-38053

Indicators of Compromise

• Unusual process spawning from SharePoint application pool processes (w3wp.exe)
• Unexpected outbound network connections from SharePoint servers
• Anomalous file creation or modification in SharePoint directories
• Suspicious authentication patterns followed by unusual server activity

Detection Strategies

• Monitor IIS and SharePoint ULS logs for unusual request patterns or error messages indicating exploitation attempts
• Implement network traffic analysis to detect anomalous POST requests to SharePoint endpoints
• Deploy endpoint detection to identify unexpected child processes spawned by SharePoint worker processes
• Review Windows Security Event logs for anomalous process creation events originating from SharePoint services

Monitoring Recommendations

• Enable enhanced SharePoint diagnostic logging and retain logs for forensic analysis
• Configure SIEM rules to correlate SharePoint authentication events with subsequent suspicious activities
• Monitor for unauthorized changes to SharePoint configuration files and web.config

How to Mitigate CVE-2022-38053

Immediate Actions Required

• Apply Microsoft security updates released in October 2022 Patch Tuesday immediately
• Audit SharePoint user accounts and remove unnecessary access privileges
• Implement network segmentation to limit access to SharePoint servers
• Enable enhanced logging and monitoring on SharePoint infrastructure

Patch Information

Microsoft has released security updates to address CVE-2022-38053 as part of the October 2022 security updates. Organizations should apply the appropriate patches based on their SharePoint version:

• SharePoint Enterprise Server 2013 SP1: Apply cumulative update
• SharePoint Enterprise Server 2016: Apply cumulative update
• SharePoint Foundation 2013 SP1: Apply cumulative update
• SharePoint Server 2019: Apply cumulative update
• SharePoint Server Subscription Edition: Apply cumulative update

For specific patch details and download links, refer to the Microsoft Security Advisory for CVE-2022-38053.

Workarounds

• Restrict network access to SharePoint servers using firewall rules to limit exposure
• Implement Web Application Firewall (WAF) rules to filter potentially malicious requests
• Review and minimize authenticated user accounts with access to SharePoint
• Consider temporarily taking vulnerable SharePoint instances offline if patches cannot be applied immediately

# Example: Restrict SharePoint access to specific IP ranges using Windows Firewall
netsh advfirewall firewall add rule name="Restrict SharePoint Access" dir=in action=allow protocol=tcp localport=443 remoteip=10.0.0.0/8
netsh advfirewall firewall add rule name="Block External SharePoint" dir=in action=block protocol=tcp localport=443 remoteip=any