CVE-2007-1097 in Wiclear
Summary
by MITRE
Unrestricted file upload vulnerability in the onAttachFiles function in the upload tool (inc/lib/attachment.lib.php) in Wiclear before 0.11.1 allows remote attackers to upload and execute arbitrary PHP code via unspecified vectors related to filename validation. NOTE: some details were obtained from third party information.
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Analysis
by VulDB Data Team • 08/20/2018
The CVE-2007-1097 vulnerability represents a critical unrestricted file upload flaw in the Wiclear web application platform prior to version 0.11.1. This vulnerability specifically targets the onAttachFiles function within the upload tool component located at inc/lib/attachment.lib.php. The flaw stems from inadequate filename validation mechanisms that fail to properly sanitize or restrict file extensions and content types during the file upload process. Attackers can exploit this weakness to bypass security controls and upload malicious files that execute arbitrary PHP code on the target server.
The technical implementation of this vulnerability demonstrates a classic input validation failure that aligns with CWE-434, which describes the weakness of allowing files to be uploaded to a web application without proper validation. The vulnerability exists in the attachment library component where the system does not adequately verify the file type or content before storing uploaded files. This weakness creates a pathway for remote attackers to upload PHP scripts or other executable code that can be executed within the web server context. The unspecified vectors mentioned in the description suggest that multiple attack paths may exist, potentially including manipulation of file extensions, content type headers, or other upload parameters that could circumvent the validation checks.
From an operational perspective, this vulnerability presents a severe risk to affected systems as it enables remote code execution capabilities that can be leveraged for complete system compromise. Attackers can upload web shells or malicious PHP scripts that allow them to execute commands on the server, potentially leading to data theft, system infiltration, or further network propagation. The impact extends beyond immediate code execution to include potential privilege escalation, data corruption, or service disruption. The vulnerability affects the core functionality of file attachment capabilities within Wiclear, making it a critical security concern for any organization relying on this platform for document management or collaborative features.
Organizations should implement immediate mitigations including updating to Wiclear version 0.11.1 or later where the vulnerability has been addressed. Additional defensive measures include implementing strict file type validation that checks both file extensions and MIME types, using random or obfuscated filenames to prevent predictable paths, and configuring web server restrictions to prevent execution of uploaded files in web-accessible directories. The ATT&CK framework categorizes this vulnerability under T1190 - Exploit Public-Facing Application, as it represents an attack against publicly accessible web application functionality. Security teams should also consider implementing network-based intrusion detection systems to monitor for suspicious file upload activities and establish proper access controls to limit who can upload files to the system.