CVE-2019-9922 in Harmis JE Messenger
Summary
by MITRE
An issue was discovered in the Harmis JE Messenger component 1.2.2 for Joomla!. Directory Traversal allows read access to arbitrary files.
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Analysis
by VulDB Data Team • 08/17/2023
The CVE-2019-9922 vulnerability represents a critical directory traversal flaw within the Harmis JE Messenger component version 1.2.2 for Joomla! platforms. This vulnerability exposes systems to unauthorized file access by allowing remote attackers to read arbitrary files from the server filesystem through improper input validation mechanisms. The flaw specifically affects the component's handling of file paths, where user-supplied input is not adequately sanitized or validated before being processed. This directory traversal vulnerability enables attackers to navigate through the file system hierarchy and access sensitive files that should remain protected, including configuration files, database credentials, and other system resources that could compromise the entire Joomla installation.
The technical implementation of this vulnerability stems from inadequate input validation within the component's file handling routines. Attackers can exploit this weakness by crafting malicious requests that include directory traversal sequences such as ../ or ..\ in file path parameters. When the vulnerable component processes these inputs without proper sanitization, it allows the application to resolve and return contents of files located outside the intended directory structure. This flaw operates at the application layer and can be exploited through various attack vectors including web interface interactions, API calls, or direct HTTP requests to the vulnerable component endpoints. The vulnerability specifically aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of CVE-2019-9922 extends beyond simple unauthorized file access, potentially leading to complete system compromise and data exfiltration. Attackers who successfully exploit this vulnerability can access sensitive information including database connection strings, administrator credentials, and configuration files that may contain encryption keys or other critical system parameters. The exposure of such information could enable further attacks including privilege escalation, lateral movement within network environments, and persistent access to compromised systems. In a typical attack scenario, an adversary might first identify the vulnerable component, then craft malicious requests to access the Joomla configuration file, which often contains database credentials and other sensitive parameters that could be leveraged for database access or additional system compromise. This vulnerability also aligns with several MITRE ATT&CK techniques including T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachments) when combined with other exploitation methods.
Mitigation strategies for CVE-2019-9922 should prioritize immediate patching of the affected Harmis JE Messenger component to version 1.2.3 or later, which contains the necessary security fixes. Organizations should also implement proper input validation and sanitization measures to prevent directory traversal attempts, including implementing strict path validation that rejects any input containing directory traversal sequences. Network-level protections such as web application firewalls can provide additional defense-in-depth by monitoring and blocking suspicious requests containing traversal patterns. System administrators should conduct comprehensive security assessments to identify other potentially vulnerable components within their Joomla installations and ensure proper file permissions are configured to limit access to sensitive system files. Regular security audits and vulnerability scanning should be implemented to detect similar weaknesses in other applications and components. The vulnerability demonstrates the critical importance of keeping content management systems and their components updated, as well as implementing proper security controls such as input validation and access controls to prevent unauthorized file system access.