CVE-2023-22952: SugarCRM RCE Vulnerability

CVE-2023-22952 Overview

CVE-2023-22952 is a code injection vulnerability affecting SugarCRM versions prior to 12.0 Hotfix 91155. The flaw exists within the EmailTemplates functionality, where insufficient input validation allows attackers to inject and execute arbitrary PHP code on vulnerable servers. This vulnerability has been actively exploited in the wild and is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

Critical Impact

Authenticated attackers can achieve remote code execution through crafted requests to the EmailTemplates module, potentially leading to complete system compromise, data exfiltration, and lateral movement within affected networks.

Affected Products

• SugarCRM versions prior to 12.0 Hotfix 91155
• SugarCRM versions prior to 11.0.5
• SugarCRM Enterprise, Professional, and Sell editions

Discovery Timeline

• 2023-01-11 - CVE-2023-22952 published to NVD
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2023-22952

Vulnerability Analysis

This vulnerability stems from improper input validation in SugarCRM's EmailTemplates functionality. The application fails to adequately sanitize user-supplied input before incorporating it into PHP code execution paths. An authenticated attacker with low privileges can craft malicious requests that inject arbitrary PHP code, which is then executed server-side with the privileges of the web server process.

The weakness is classified under CWE-20 (Improper Input Validation) and CWE-94 (Improper Control of Generation of Code, or 'Code Injection'). The attack can be executed remotely over the network without requiring user interaction, making it particularly dangerous in internet-facing deployments.

Root Cause

The root cause of CVE-2023-22952 is missing input validation within the EmailTemplates module. When processing template-related requests, SugarCRM does not properly sanitize or filter input parameters that can influence PHP code generation or execution. This oversight allows malicious PHP code to be injected through specially crafted request parameters, bypassing intended security controls.

Attack Vector

The attack is network-based and requires low-privilege authentication to the SugarCRM application. Once authenticated, an attacker sends a crafted HTTP request to the EmailTemplates endpoint containing malicious PHP code embedded within template parameters. The vulnerable application processes this input without adequate validation, resulting in the injected code being executed on the server.

Successful exploitation can lead to web shell deployment, enabling persistent access to the compromised system. The Packet Storm Security advisory documents exploitation techniques including shell upload capabilities. Given the CISA KEV listing, this vulnerability is confirmed to be actively exploited in real-world attacks.

Detection Methods for CVE-2023-22952

Indicators of Compromise

• Unexpected PHP files or web shells in the SugarCRM installation directory, particularly in upload or cache folders
• Anomalous HTTP POST requests to EmailTemplates-related endpoints containing PHP code patterns such as <?php, eval(, base64_decode(, or system(
• Web server error logs showing PHP syntax errors or unexpected code execution attempts
• Unauthorized outbound network connections from the web server process

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing PHP code injection patterns targeting SugarCRM endpoints
• Monitor web server access logs for unusual activity patterns on /index.php routes related to EmailTemplates module
• Deploy file integrity monitoring (FIM) on SugarCRM directories to detect unauthorized file modifications or new file creation
• Configure intrusion detection systems (IDS) to alert on POST requests with suspicious payloads to SugarCRM installations

Monitoring Recommendations

• Enable detailed logging for all SugarCRM application requests and regularly review for anomalies
• Implement real-time alerting for any new file creation in web-accessible directories
• Monitor for unusual PHP process behavior including unexpected child processes or network connections
• Track authentication events and correlate with subsequent high-risk API calls

How to Mitigate CVE-2023-22952

Immediate Actions Required

• Apply SugarCRM Hotfix 91155 or upgrade to version 12.0 or later immediately
• Conduct a forensic review of affected systems to identify potential compromise indicators
• Restrict network access to SugarCRM installations to trusted IP ranges where possible
• Review user accounts and privileges, removing unnecessary access

Patch Information

SugarCRM has released Hotfix 91155 to address this vulnerability. Administrators should apply this hotfix or upgrade to SugarCRM version 12.0 or later. Detailed patch information and installation instructions are available in the SugarCRM Security Advisory SA-2023-001. Given active exploitation, patching should be treated as an emergency priority.

Workarounds

• If immediate patching is not possible, consider temporarily disabling the EmailTemplates module until the fix can be applied
• Implement strict WAF rules to block requests containing PHP code patterns in POST parameters
• Restrict access to the SugarCRM administrative interface to internal networks or VPN-connected users only
• Deploy additional input validation at the reverse proxy or load balancer level as a defense-in-depth measure

# Example: Apache mod_security rule to detect PHP injection attempts
SecRule REQUEST_BODY "@rx <\?php|eval\s*\(|base64_decode\s*\(" \
    "id:100001,phase:2,deny,status:403,log,msg:'Potential PHP injection attempt blocked'"