CVE-2006-5498 in Segue CMS
Summary
by MITRE
Directory traversal vulnerability in themes/program/themesettings.inc.php in Segue CMS 1.5.8 and earlier allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the theme parameter.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability described in CVE-2006-5498 represents a critical directory traversal flaw within the Segue CMS 1.5.8 and earlier versions, specifically affecting the themesettings.inc.php file located in the themes/program directory. This vulnerability arises from insufficient input validation and sanitization of user-supplied parameters, creating an exploitable condition that allows remote attackers to manipulate file inclusion mechanisms. The flaw manifests when the theme parameter receives input containing .. (dot dot) sequences that traverse the directory structure to access files outside the intended scope, effectively bypassing access controls and security boundaries.
The technical implementation of this vulnerability stems from the application's failure to properly validate or sanitize the theme parameter before using it in file inclusion operations. When an attacker supplies a malicious theme parameter containing directory traversal sequences such as ../../../../../etc/passwd or similar paths, the application processes these inputs without adequate filtering, leading to arbitrary file inclusion. This behavior directly maps to CWE-22, which defines improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability operates at the application layer and can be exploited through HTTP requests that manipulate the theme parameter, making it particularly dangerous for web applications that rely on dynamic file inclusion based on user input.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables full remote code execution capabilities when combined with appropriate attack vectors. An attacker can leverage this flaw to include and execute arbitrary local files on the server, potentially gaining complete control over the affected system. This includes the ability to read sensitive system files, access database credentials, modify application files, or even establish persistent backdoors. The vulnerability affects not only the confidentiality of the system but also its integrity and availability, as attackers can modify critical application components or cause denial of service conditions. The implications are particularly severe for content management systems like Segue CMS, where the web server typically runs with elevated privileges and has access to sensitive data repositories.
Mitigation strategies for this vulnerability should address both immediate remediation and long-term architectural improvements. The most effective immediate solution involves implementing proper input validation and sanitization techniques that reject or filter out directory traversal sequences from all user-supplied parameters. This includes validating the theme parameter against a whitelist of approved themes or implementing proper path normalization that strips out dangerous sequences such as .., %2e%2e, or similar encoded variants. Organizations should also consider implementing the principle of least privilege for web applications, ensuring that the web server runs with minimal required permissions and that file inclusion operations are restricted to specific directories. Additionally, application-level firewalls or web application firewalls can be deployed to detect and block suspicious patterns in HTTP requests, providing an additional layer of defense. The vulnerability highlights the importance of following secure coding practices as outlined in OWASP Top 10 and NIST Cybersecurity Framework guidelines, emphasizing the need for input validation, output encoding, and proper access controls in all web applications. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other components of the application stack, as directory traversal vulnerabilities often indicate broader security architecture issues that require comprehensive remediation approaches.