CVE-2008-3385 in php Help Agent
Summary
by MITRE
Directory traversal vulnerability in include/head_chat.inc.php in php Help Agent 1.0 and 1.1 Full allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the content parameter. NOTE: in some environments, this can be leveraged for remote file inclusion by using a UNC share pathname or an ftp, ftps, or ssh2.sftp URL.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 11/02/2024
The vulnerability identified as CVE-2008-3385 represents a critical directory traversal flaw within the php Help Agent 1.0 and 1.1 Full web application. This security weakness resides in the include/head_chat.inc.php file and allows remote attackers to manipulate file inclusion mechanisms through carefully crafted input parameters. The vulnerability specifically exploits the content parameter where a .. (dot dot) sequence can be injected to navigate directory structures and access arbitrary local files on the server filesystem. This type of vulnerability falls under the CWE-22 category of Improper Limitation of a Pathname to a Restricted Directory, commonly known as Path Traversal or Directory Traversal.
The technical exploitation of this vulnerability occurs when the application fails to properly validate or sanitize user input before using it in file inclusion operations. When an attacker supplies a content parameter containing directory traversal sequences such as ../../etc/passwd or similar paths, the application processes these inputs without adequate restrictions, allowing access to files outside the intended directory structure. This flaw enables attackers to read sensitive files, execute arbitrary code, or potentially gain unauthorized access to system resources. The vulnerability is particularly dangerous because it can be leveraged to access system files, configuration data, or other sensitive information that should remain protected from unauthorized access.
The operational impact of CVE-2008-3385 extends beyond simple file reading capabilities to potentially enable complete system compromise. In environments where the web application runs with elevated privileges, attackers could leverage this vulnerability to execute arbitrary commands on the server, establish persistent backdoors, or escalate privileges to gain administrative control. The vulnerability's potential for remote file inclusion further amplifies its danger, as demonstrated by the note indicating that attackers can use UNC share pathnames or URLs from protocols such as ftp, ftps, or ssh2.sftp to extend their attack surface. This capability allows attackers to bypass traditional file inclusion restrictions and potentially access files stored on remote systems or through network protocols that may not be properly filtered.
Security practitioners should consider this vulnerability in the context of the ATT&CK framework, specifically under the T1059.007 technique for Command and Scripting Interpreter: PowerShell, as the ability to execute arbitrary code through file inclusion can enable attackers to run PowerShell scripts or other malicious payloads. The vulnerability also relates to T1566.001 for Initial Access: Phishing, as attackers may use this flaw to deliver malicious payloads through compromised web applications. Mitigation strategies should include implementing proper input validation and sanitization, applying the principle of least privilege to web application processes, and ensuring that all file inclusion operations use absolute paths rather than relative paths that can be manipulated by attackers. Additionally, organizations should deploy web application firewalls and implement proper access controls to limit the impact of such vulnerabilities.
The remediation approach for CVE-2008-3385 requires immediate attention from system administrators and security teams responsible for maintaining the php Help Agent installations. The most effective solution involves implementing strict input validation that filters out directory traversal sequences such as .., ., and other potentially dangerous path components. Organizations should also consider implementing proper output encoding, using allowlists for acceptable file paths, and ensuring that all file inclusion operations are performed within restricted directories. The vulnerability demonstrates the importance of input validation and proper secure coding practices, as it stems from inadequate sanitization of user-supplied data before using it in file operations. Additionally, regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other applications and systems within the organization's infrastructure.