CVE-2006-5725 in Smartgate Ssl Server
Summary
by MITRE
The SSL server in AEP Smartgate 4.3b allows remote attackers to determine existence of directories via a direct request for a directory URI, which returns different HTTP status codes for existing and non-existing directories.
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Analysis
by VulDB Data Team • 04/26/2026
The vulnerability described in CVE-2006-5725 represents a critical information disclosure flaw within the SSL server implementation of AEP Smartgate version 4.3b. This vulnerability stems from the server's improper handling of directory traversal requests, where it fails to maintain consistent response behavior for both existing and non-existing directory paths. The flaw exists in the web server's response mechanism that directly exposes directory structure information to remote attackers through HTTP status code variations. When an attacker submits a direct request for a directory URI, the server responds with different HTTP status codes based on whether the requested directory exists within the filesystem, thereby leaking directory structure information that could be exploited for further reconnaissance activities.
This vulnerability falls under the category of information disclosure as defined by CWE-200, specifically manifesting as a directory traversal information leak. The technical implementation flaw resides in the server's lack of consistent error handling for directory access requests, creating a side-channel information leakage mechanism. The server's inconsistent response behavior creates a predictable pattern where existing directories return one set of HTTP status codes while non-existing directories return different codes, effectively allowing attackers to enumerate directory structures without requiring authentication or authorization. This type of vulnerability is particularly dangerous as it provides attackers with mapping information that can be used to identify sensitive directories, hidden resources, or application components that might contain additional vulnerabilities.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the foundational knowledge required for more sophisticated attacks. An attacker can systematically probe the server to map directory structures, identify potentially sensitive paths, and discover application logic that might be exposed through directory listings. This information can be leveraged to plan subsequent attacks including path traversal exploits, directory traversal attacks, or to identify potential targets for further reconnaissance. The vulnerability affects the confidentiality aspect of the CIA triad by exposing directory structures that should remain hidden from unauthorized users, potentially revealing application architecture details that could be used to craft more targeted attacks against the system.
Mitigation strategies for this vulnerability should focus on implementing consistent error handling across all directory access requests, ensuring that the server returns uniform HTTP status codes regardless of whether directories exist or not. Organizations should configure their web servers to avoid exposing directory structure information through HTTP responses and implement proper access controls that prevent unauthorized directory enumeration. The solution involves modifying the server's response logic to return consistent error codes for all directory access attempts, typically implementing a standard response such as 404 Not Found for all non-accessible directory requests. Additionally, implementing proper input validation and sanitization for directory URI requests can prevent attackers from exploiting this vulnerability through crafted requests that might otherwise bypass normal access controls. Security configurations should also include disabling directory listing features and implementing proper authentication mechanisms to ensure that even if directory structures are discovered, unauthorized access remains prevented. This vulnerability demonstrates the importance of consistent security implementation in web server configurations and highlights the need for proper error handling practices that do not inadvertently leak system information. The ATT&CK framework categorizes this as a reconnaissance technique under T1069.001 - Permission Groups Discovery, where attackers gather information about system structures and access controls to plan further attacks.