CVE-2025-55267 Overview
HCL Aftermarket DPC is affected by an Unrestricted File Upload vulnerability (CWE-434) that allows attackers to upload and execute malicious scripts, potentially gaining full control over the server. This vulnerability enables remote attackers to bypass file upload restrictions and deploy arbitrary executable content to the target system without requiring authentication or user interaction.
Critical Impact
Successful exploitation allows attackers to upload malicious scripts and gain complete server control, leading to full system compromise, data theft, and potential lateral movement within the network.
Affected Products
- HCL Aftermarket Cloud version 1.0.0
- HCLTech Aftermarket Cloud platform deployments
Discovery Timeline
- 2026-03-26 - CVE-2025-55267 published to NVD
- 2026-03-26 - Last updated in NVD database
Technical Details for CVE-2025-55267
Vulnerability Analysis
This vulnerability stems from improper validation of file uploads within the HCL Aftermarket DPC application. The application fails to adequately restrict the types of files that users can upload, allowing attackers to bypass intended security controls and upload executable content such as web shells, scripts, or other malicious payloads.
When exploited, an attacker can leverage this weakness to execute arbitrary code on the server with the privileges of the web application. The network-accessible attack vector combined with no required authentication or user interaction makes this vulnerability particularly dangerous for internet-facing deployments.
Root Cause
The root cause is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type). The application does not properly validate file extensions, MIME types, or file content before accepting uploads. This allows attackers to circumvent file type restrictions by manipulating file headers, using double extensions, or exploiting insufficient server-side validation logic.
Attack Vector
The vulnerability is exploitable over the network by unauthenticated attackers. An adversary can craft a malicious file—such as a PHP web shell, JSP backdoor, or ASPX payload—and upload it through the vulnerable file upload functionality. Once uploaded, the attacker can access the malicious file directly via the web server, triggering code execution within the server environment.
The attack typically proceeds as follows: the attacker identifies the file upload endpoint, crafts a malicious script disguised as an allowed file type or exploiting missing validation, uploads the payload to the server, and then accesses the uploaded file URL to execute the malicious code.
Detection Methods for CVE-2025-55267
Indicators of Compromise
- Unusual file uploads with executable extensions (.php, .jsp, .aspx, .sh) in upload directories
- Web server access logs showing requests to newly created files in upload locations
- Outbound network connections from the web server to unknown external IP addresses
- Unexpected processes spawned by the web server user account
Detection Strategies
- Monitor file system events for creation of executable files in web-accessible directories
- Implement web application firewall (WAF) rules to detect and block malicious file upload attempts
- Analyze HTTP POST requests containing file uploads for suspicious content patterns or obfuscated payloads
- Deploy file integrity monitoring to alert on unauthorized file creation in upload paths
Monitoring Recommendations
- Enable detailed logging for all file upload operations including file names, sizes, and source IP addresses
- Configure alerts for web shell signatures and known malicious file patterns in uploaded content
- Review web server access logs regularly for access to unexpected files in upload directories
- Monitor for privilege escalation attempts and unusual command execution following file uploads
How to Mitigate CVE-2025-55267
Immediate Actions Required
- Apply the security patch from HCL Software as soon as available
- Restrict file upload functionality to authenticated users only where possible
- Implement strict allowlist-based file type validation on both client and server side
- Store uploaded files outside the web root or in locations where script execution is disabled
- Review upload directories for any suspicious or unauthorized files
Patch Information
HCL Software has published information regarding this vulnerability. Administrators should consult the HCL Software Knowledge Base Article for official patch guidance and remediation instructions. Apply all available security updates to HCL Aftermarket Cloud deployments immediately.
Workarounds
- Disable file upload functionality entirely if not required for business operations
- Implement a web application firewall with rules to block executable file uploads
- Configure the web server to prevent script execution in upload directories using appropriate directives
- Apply network-level access controls to limit exposure of the vulnerable application
# Example: Disable script execution in Apache upload directory
# Add to .htaccess or httpd.conf for the uploads folder
<Directory "/var/www/html/uploads">
Options -ExecCGI
RemoveHandler .php .phtml .php3 .php4 .php5 .jsp .aspx .asp
AddType text/plain .php .phtml .php3 .php4 .php5 .jsp .aspx .asp
</Directory>
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
