CVE-2004-1545 in MoniWiki
Summary
by MITRE
UploadFile.php in MoniWiki 1.0.9.2 and earlier, when used with Apache mod_mime, does not properly handle files with two file extensions, such as .php.hwp, which allows remote attackers to upload and execute arbitrary code.
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Analysis
by VulDB Data Team • 06/22/2018
The vulnerability identified as CVE-2004-1545 affects MoniWiki version 1.0.9.2 and earlier, specifically within the UploadFile.php component when integrated with Apache mod_mime module. This represents a critical security flaw that stems from improper file extension handling mechanisms within the web application's file upload functionality. The vulnerability occurs due to insufficient validation of file extensions, creating a pathway for malicious actors to bypass security controls and execute arbitrary code on the target system.
The technical root cause of this vulnerability lies in the application's failure to properly sanitize and validate file extensions during the upload process. When Apache mod_mime processes files with multiple extensions such as .php.hwp, the system does not correctly identify the true file type or extension that determines the file's execution behavior. This misconfiguration allows attackers to upload files that appear benign due to their multiple extensions but actually contain malicious code that executes with the privileges of the web server. The flaw essentially creates a false positive in the file type detection system, enabling attackers to exploit the trust relationship between the web application and the server.
From an operational perspective, this vulnerability poses significant risks to organizations using MoniWiki installations. Remote attackers can leverage this weakness to upload malicious files that execute arbitrary code on the server, potentially leading to complete system compromise, data exfiltration, or further lateral movement within the network. The impact extends beyond simple code execution to include potential privilege escalation, denial of service conditions, and persistent backdoor installation. The vulnerability's exploitation requires minimal technical skill, making it particularly dangerous as it can be targeted by both skilled attackers and automated exploitation tools.
The vulnerability aligns with CWE-434, which addresses the improper restriction of uploads of executable files, and demonstrates characteristics consistent with attack patterns found in the MITRE ATT&CK framework under the initial access and execution phases. Organizations should implement immediate mitigations including updating to MoniWiki version 1.0.9.3 or later, which contains the necessary fixes for proper file extension handling. Additional protective measures include configuring Apache mod_mime to properly handle multiple extensions, implementing strict file type validation, and deploying web application firewalls to monitor and block suspicious upload activities. Regular security audits and proper input validation practices should be enforced to prevent similar vulnerabilities in other applications.