CVE-2006-2156 in X7 Chat
Summary
by MITRE
Directory traversal vulnerability in help/index.php in X7 Chat 2.0 and earlier allows remote attackers to include arbitrary files via .. (dot dot) sequences in the help_file parameter.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 06/23/2024
The vulnerability identified as CVE-2006-2156 represents a critical directory traversal flaw within the X7 Chat 2.0 software suite, specifically affecting the help/index.php component. This issue stems from insufficient input validation mechanisms that fail to properly sanitize user-supplied data before processing file inclusion requests. The vulnerability manifests when the application processes the help_file parameter without adequate restrictions on directory navigation sequences, allowing malicious actors to manipulate file paths through the use of .. (dot dot) sequences.
The technical exploitation of this vulnerability occurs through the manipulation of the help_file parameter in the help/index.php script, where attackers can append directory traversal sequences to access files outside the intended directory structure. This flaw enables remote attackers to include arbitrary files from the server filesystem, potentially leading to unauthorized access to sensitive system resources, configuration files, or even system-level files that should remain protected. The vulnerability is classified under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to execute arbitrary code on the affected system, depending on the server configuration and file permissions. An attacker could leverage this vulnerability to access administrative files, database credentials, or other sensitive information stored within the application's directory structure. The vulnerability affects all versions of X7 Chat up to and including version 2.0, making it particularly concerning given the widespread use of this chat application in web environments. The attack vector is entirely remote, requiring no local system access or authentication, which significantly increases the exploitability and potential impact.
Security professionals should consider this vulnerability in the context of the ATT&CK framework, particularly under the techniques related to privilege escalation and credential access. The vulnerability enables an attacker to move laterally within a network by accessing system files that may contain authentication credentials or configuration details. Mitigation strategies should include immediate patching of the affected software to version 2.1 or later, which contains the necessary input validation fixes. Additionally, implementing proper input sanitization measures, including strict validation of file path parameters and the removal of directory traversal sequences, should be enforced. Network segmentation and web application firewalls can provide additional protective layers, while regular security audits and code reviews should be conducted to identify similar vulnerabilities in other applications within the infrastructure.