CVE-2006-3972 in Ajax Chat
Summary
by MITRE
Directory traversal vulnerability in includes/operator_chattranscript.php in Scott Weedon Ajax Chat, possibly 0.1, allows remote attackers to read arbitrary files via a .. (dot dot) in the chatid parameter.
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Analysis
by VulDB Data Team • 06/25/2025
The vulnerability identified as CVE-2006-3972 represents a classic directory traversal flaw within the Scott Weedon Ajax Chat application version 0.1. This security weakness resides in the includes/operator_chattranscript.php file where the chatid parameter fails to properly validate user input before processing file operations. The vulnerability arises from insufficient sanitization of the chatid parameter, which allows remote attackers to manipulate the input string to traverse directory structures and access files outside the intended scope of the application. This type of vulnerability falls under the Common Weakness Enumeration category CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The flaw enables attackers to exploit the application's file handling mechanism by injecting .. (dot dot) sequences into the chatid parameter, thereby bypassing normal access controls and potentially gaining unauthorized access to sensitive system files.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to read arbitrary files from the server filesystem. This could include configuration files containing database credentials, application source code, user data, or system files that may contain additional sensitive information. Attackers could leverage this vulnerability to escalate their privileges, gather intelligence for further attacks, or even potentially execute arbitrary code if they can access files that allow for code execution. The remote nature of the attack means that an attacker does not require physical access to the system or local network privileges to exploit this vulnerability. The attack vector is straightforward, requiring only a properly crafted HTTP request that includes the directory traversal sequence in the chatid parameter, making this vulnerability particularly dangerous as it can be exploited by automated scanning tools and bots. This vulnerability aligns with the MITRE ATT&CK framework under the technique T1083, which covers File and Directory Discovery, as attackers can use this vulnerability to enumerate the filesystem structure and identify valuable targets for further exploitation.
Mitigation strategies for CVE-2006-3972 must focus on implementing proper input validation and sanitization mechanisms within the application code. The most effective approach involves implementing strict parameter validation that rejects any input containing directory traversal sequences such as .. or %2e%2e. Developers should employ whitelisting techniques where only predefined valid chatid values are accepted, or implement proper path normalization that strips out or encodes potentially dangerous sequences. The application should also enforce proper access controls and ensure that file operations are performed within a restricted directory, preventing access to sensitive system paths. Additionally, the application should implement proper error handling that does not reveal internal filesystem information to users. Organizations should consider implementing web application firewalls that can detect and block directory traversal attempts, and regular security audits should be conducted to identify similar vulnerabilities in other components of the application. Given the age of this vulnerability, it is crucial for organizations using legacy Ajax Chat implementations to either upgrade to supported versions or implement comprehensive input validation measures to prevent exploitation of this and similar directory traversal vulnerabilities.