CVE-2007-2630 in ActiveCampaign
Summary
by MITRE
Incomplete blacklist vulnerability in filemanager/browser/default/connectors/php/config.php in the FCKeditor module, as used in ActiveCampaign 1-2-All (aka 12All) 4.50 through 4.53.13, and possibly other products, allows remote authenticated administrators to upload and possibly execute .php4 and .php5 files via unspecified vectors. NOTE: this issue is reachable through filemanager/browser/default/browser.html.
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Analysis
by VulDB Data Team • 08/31/2018
The vulnerability described in CVE-2007-2630 represents a critical security flaw in the FCKeditor module implementation within ActiveCampaign 1-2-All version 4.50 through 4.53.13. This issue manifests as an incomplete blacklist vulnerability located in the filemanager/browser/default/connectors/php/config.php configuration file, which serves as a core component of the file upload functionality within the web application. The flaw specifically affects the file type validation mechanism that controls which file extensions are permitted for upload operations, creating a dangerous gap in the security controls that could be exploited by malicious actors.
The technical implementation of this vulnerability stems from the inadequate filtering mechanism in the PHP configuration file where the system maintains a blacklist of prohibited file extensions. However, this blacklist fails to comprehensively cover all potentially dangerous file types, leaving gaps that allow attackers to bypass restrictions. The vulnerability specifically permits the upload of .php4 and .php5 files, which are executable PHP scripts that could be leveraged to execute arbitrary code on the target server. The attack vector is facilitated through the browser.html interface located at filemanager/browser/default/browser.html, which provides a user interface for file management operations that ultimately connect to the vulnerable configuration file.
The operational impact of this vulnerability is severe and multifaceted, as it allows remote authenticated administrators to gain unauthorized code execution capabilities on the target system. This represents a significant escalation of privileges since the attacker must already possess administrative credentials, but the vulnerability enables them to bypass the intended security controls that should prevent the upload of executable scripts. The potential consequences include complete system compromise, data exfiltration, and the establishment of persistent backdoors or command and control channels. This vulnerability directly relates to CWE-434, which describes "Unrestricted Upload of File with Dangerous Type" and aligns with ATT&CK technique T1190, "Exploit Public-Facing Application" as the attack occurs through publicly accessible web interfaces.
The security implications extend beyond immediate code execution to encompass broader system compromise scenarios where attackers can establish persistent access through the uploaded malicious files. The vulnerability demonstrates poor input validation practices and highlights the dangers of relying solely on blacklist-based filtering mechanisms, which are inherently flawed due to the infinite variety of potential file types that could be misused. Organizations using affected versions of ActiveCampaign should immediately implement mitigations including comprehensive file type validation, removal of dangerous file extensions from upload capabilities, and implementation of proper access controls to prevent unauthorized administrative access. The vulnerability also underscores the importance of proper security testing and code review practices to identify and address such incomplete security controls before they can be exploited by malicious actors in the wild.