CVE-2016-8938 in UrbanCode Deploy
Summary
by MITRE
IBM UrbanCode Deploy could allow a user to execute code using a specially crafted file upload that would replace code on the server. This code could be executed on the UCD agent machines that host customer's production applications.
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Analysis
by VulDB Data Team • 08/09/2020
IBM UrbanCode Deploy represents a comprehensive application release management platform that automates deployment processes across complex enterprise environments. The vulnerability described in CVE-2016-8938 specifically targets the file upload functionality within this deployment system, creating a critical security risk that could compromise the integrity of production environments. This flaw resides in the server-side file handling mechanisms that process uploaded artifacts during deployment operations.
The technical implementation of this vulnerability stems from insufficient input validation and inadequate file type restrictions within the UrbanCode Deploy server component. Attackers can craft malicious files that, when uploaded through the legitimate deployment interface, bypass security controls and replace existing code on the server. The vulnerability manifests when the system fails to properly validate file extensions, content signatures, or file attributes during the upload process, allowing arbitrary code execution through specially crafted file uploads. This weakness aligns with CWE-434 which categorizes insecure file upload vulnerabilities, and specifically relates to CWE-20 which covers improper input validation.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise of UCD agent machines that host critical production applications. When successful, attackers can execute arbitrary code with the privileges of the UrbanCode Deploy service account, potentially leading to unauthorized access to production environments, data exfiltration, or complete system takeover. The agents that execute deployment commands on customer servers become vulnerable attack vectors, creating a chain of compromise that could affect multiple production systems. This vulnerability directly impacts the principle of least privilege and can be categorized under ATT&CK technique T1059 which covers command and scripting interpreter execution.
The exploitation of this vulnerability requires an attacker to gain access to the UrbanCode Deploy interface with sufficient privileges to upload files, typically through a valid user account or session. Once the malicious file is uploaded, it can be processed by the deployment system and executed on the target agent machines, potentially executing commands with elevated privileges. The attack vector represents a classic server-side include vulnerability where uploaded files are treated as executable code rather than benign artifacts. This issue demonstrates the critical importance of validating and sanitizing all user-supplied input, particularly in deployment and automation platforms that handle sensitive production environments.
Organizations utilizing IBM UrbanCode Deploy should implement immediate mitigations including restricting file upload capabilities, implementing strict file type validation, and applying the vendor-provided security patches. The recommended approach involves configuring the system to reject executable file types during upload processes and implementing additional security controls such as file content analysis and sandboxing techniques. Security monitoring should focus on unusual file upload patterns and unauthorized access attempts to deployment interfaces. System administrators should also consider implementing network segmentation to limit access to UrbanCode Deploy systems and establish robust audit trails for all file upload operations. The vulnerability highlights the necessity of following secure coding practices and implementing defense-in-depth strategies to protect critical deployment infrastructure from unauthorized code execution attacks.