CVE-2014-3947 in powermail
Summary
by MITRE
Unrestricted file upload vulnerability in the powermail extension before 1.6.11 and 2.x before 2.0.14 for TYPO3 allows remote attackers to execute arbitrary code by uploading a file with a crafted extension, then accessing it via unspecified vectors.
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Analysis
by VulDB Data Team • 03/13/2019
The vulnerability identified as CVE-2014-3947 represents a critical unrestricted file upload flaw within the powermail extension for TYPO3 content management systems. This security weakness affects versions prior to 1.6.11 and 2.x prior to 2.0.14, creating a significant attack surface that malicious actors can exploit to gain remote code execution capabilities. The vulnerability stems from inadequate input validation and sanitization mechanisms within the file upload functionality of the powermail extension, which fails to properly verify file extensions and content types before storing uploaded files on the server.
The technical implementation of this flaw allows attackers to bypass normal file upload restrictions by crafting malicious files with extensions that appear legitimate but contain executable code. When users upload files through the vulnerable powermail extension, the system does not adequately validate whether the uploaded file matches its claimed extension or contains malicious payload within its content. This validation failure enables attackers to upload web shells, script files, or other malicious executables that can be executed on the target server. The unspecified vectors mentioned in the vulnerability description suggest that once a malicious file is uploaded, attackers can access it through various pathways including direct web access or indirect execution through other application components.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with persistent access to the compromised TYPO3 environment. Successful exploitation can lead to complete system compromise, data exfiltration, and potential lateral movement within network infrastructure. Attackers can leverage this vulnerability to establish backdoors, install additional malware, or use the compromised server as a staging point for further attacks. The vulnerability affects organizations using TYPO3 installations with the powermail extension, potentially impacting thousands of websites that rely on this popular content management system for business operations.
Security practitioners should note that this vulnerability aligns with CWE-434, which specifically addresses the issue of unrestricted file upload where applications accept files without proper validation of their content or type. The attack pattern follows typical exploitation techniques described in the MITRE ATT&CK framework under the execution and persistence phases, where attackers leverage file upload capabilities to establish malicious presence on target systems. Organizations should prioritize immediate patching of affected TYPO3 installations to address this vulnerability, as the window for exploitation remains open for systems running vulnerable versions of the powermail extension. Additionally, implementing proper input validation, restricting file upload directories, and monitoring upload activities can serve as defensive measures to reduce the risk of exploitation.
The remediation approach requires organizations to upgrade to powermail extension versions 1.6.11 or later for 1.x releases and 2.0.14 or later for 2.x releases, ensuring that proper file validation mechanisms are in place. System administrators should also implement network-level restrictions on file upload operations, conduct regular security assessments of installed extensions, and maintain up-to-date threat intelligence to identify potential exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation and the potential consequences of inadequate security controls in web application frameworks.