CVE-2006-5596 in Smartgate Ssl Server
Summary
by MITRE
Directory traversal vulnerability in the SSL server in AEP Smartgate 4.3b allows remote attackers to download arbitrary files via ..\ (dot dot backslash) sequences in an HTTP GET request.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability identified as CVE-2006-5596 represents a critical directory traversal flaw within the SSL server component of AEP Smartgate version 4.3b. This security weakness enables remote attackers to access files outside the intended directory structure through carefully crafted HTTP GET requests containing ..\ sequences. The vulnerability specifically affects the web server functionality that handles SSL connections, making it particularly dangerous as it can be exploited over network connections without requiring local system access or authentication. The flaw stems from inadequate input validation and path sanitization within the server's file handling mechanisms, allowing malicious actors to manipulate directory navigation sequences and gain unauthorized access to sensitive system files. 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 technical implementation of this vulnerability exploits the fundamental way the AEP Smartgate SSL server processes file requests through HTTP GET methods. When an attacker submits a request containing ..\ sequences, the server fails to properly validate or sanitize these path components, allowing the traversal logic to interpret the malicious input as legitimate navigation commands. The ..\ backslash sequences effectively instruct the server to move up one directory level in the file system hierarchy, potentially enabling access to system files, configuration data, or other sensitive resources that should remain protected from remote access. This vulnerability demonstrates a classic lack of proper input validation and output encoding in web server applications, where user-supplied data is directly used in file system operations without adequate sanitization or access control mechanisms.
The operational impact of this vulnerability extends beyond simple file access, as it can potentially lead to complete system compromise and data exfiltration. Remote attackers could exploit this weakness to download system configuration files, authentication credentials, application source code, or other sensitive information stored on the server. The vulnerability affects the SSL server functionality, meaning that even encrypted connections could be exploited, potentially compromising the security assurances provided by SSL/TLS encryption. Attackers could leverage this vulnerability to gather intelligence about the system, identify additional attack vectors, or even deploy further malicious payloads. The implications are particularly severe for network infrastructure devices like the AEP Smartgate, as these systems often serve as critical access points for network traffic and may contain sensitive operational data or control mechanisms.
Mitigation strategies for CVE-2006-5596 must address both the immediate vulnerability and broader security posture of the affected system. The most effective immediate solution involves implementing proper input validation and path sanitization within the SSL server component, ensuring that all user-supplied file paths are thoroughly checked and normalized before any file system operations are performed. Organizations should deploy web application firewalls or security filters that can detect and block suspicious path traversal patterns in HTTP requests. System administrators should also implement proper access controls and file permissions to limit what files can be accessed even if the vulnerability is exploited. Additionally, the affected AEP Smartgate devices should be updated to a patched version that addresses this directory traversal vulnerability, following the vendor's security advisory. This vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachment) as it provides attackers with the means to discover and access sensitive files on the target system, potentially enabling further exploitation or data theft operations.