CVE-2002-0683 in Carello
Summary
by MITRE
Directory traversal vulnerability in Carello 1.3 allows remote attackers to execute programs on the server via a .. (dot dot) in the VBEXE parameter.
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Analysis
by VulDB Data Team • 09/14/2025
The CVE-2002-0683 vulnerability represents a critical directory traversal flaw in Carello 1.3, a web application framework that was widely used for creating dynamic web content. This vulnerability stems from inadequate input validation mechanisms within the application's handling of the VBEXE parameter, which is used to specify virtual basic executable files for processing. The flaw allows remote attackers to manipulate file paths through the use of directory traversal sequences such as .. (dot dot) to navigate outside the intended directory boundaries. This type of 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 technical implementation of this vulnerability exploits the lack of proper sanitization of user-supplied input in the VBEXE parameter. When a user submits a request containing a path traversal sequence, the application fails to validate or sanitize the input before processing it, allowing the attacker to specify arbitrary file paths. This weakness enables an attacker to access files outside the web root directory, potentially leading to unauthorized access to sensitive system files, configuration data, or even execute arbitrary code on the server. The vulnerability is particularly dangerous because it can be exploited remotely without requiring authentication, making it an attractive target for automated attacks and exploitation frameworks.
The operational impact of CVE-2002-0683 extends beyond simple information disclosure, as it can lead to complete system compromise. An attacker who successfully exploits this vulnerability can potentially read sensitive files such as database credentials, application configuration files, or even system files that contain critical security information. The ability to execute programs on the server creates a pathway for privilege escalation and persistent access to the compromised system. This vulnerability aligns with ATT&CK technique T1059, which covers command and script injection, and T1083, which addresses file and directory discovery, as attackers can use the vulnerability to both execute commands and enumerate the target system's file structure. The impact is particularly severe in environments where Carello applications are deployed with elevated privileges, as it could lead to complete system takeover.
Mitigation strategies for this vulnerability focus on implementing proper input validation and sanitization mechanisms. Organizations should immediately apply vendor patches or upgrade to versions that address this specific directory traversal issue. The implementation of strict input validation should include filtering or rejecting any input containing directory traversal sequences such as .. or %2e%2e. Additionally, the application should be configured to run with minimal required privileges and implement proper access controls to limit the damage that could occur even if the vulnerability is exploited. Network segmentation and intrusion detection systems can help monitor for exploitation attempts, while regular security assessments should be conducted to identify similar vulnerabilities in other applications. The vulnerability also underscores the importance of following secure coding practices and adhering to the principle of least privilege in application design, as outlined in industry security frameworks and standards.