CVE-2008-4483 in Crux Software
Summary
by MITRE
Directory traversal vulnerability in index.php in Crux Gallery 1.32 and earlier, when magic_quotes_gpc is disabled, 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 • 11/05/2024
The vulnerability identified as CVE-2008-4483 represents a critical directory traversal flaw within the Crux Gallery 1.32 content management system that operates under specific conditions. This weakness exists in the index.php file and specifically targets applications where the magic_quotes_gpc PHP configuration setting is disabled. The vulnerability stems from insufficient input validation and sanitization of user-supplied parameters, particularly the theme parameter that controls the gallery's visual presentation. When magic_quotes_gpc is turned off, the application fails to properly filter or escape special characters in user input, creating an avenue for malicious actors to manipulate file inclusion mechanisms. The exploitation technique leverages the .. (dot dot) sequence to navigate upward through the directory structure, allowing attackers to access files outside the intended gallery directory boundaries. This type of vulnerability falls under the CWE-22 category, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability extends beyond simple file disclosure, as it enables arbitrary code execution capabilities when combined with appropriate attack vectors. Remote attackers can leverage this flaw to include local files on the server, potentially gaining access to sensitive configuration files, database credentials, or other system resources that should remain protected. The vulnerability's exploitation requires minimal privileges and can be executed through standard web-based attacks, making it particularly dangerous for publicly accessible web applications. Attackers can craft malicious URLs that target the vulnerable theme parameter, allowing them to traverse directories and include files that may contain malicious code or sensitive information. This vulnerability directly aligns with ATT&CK technique T1059.007, which covers the use of script-based execution, and T1566.001, which involves the exploitation of vulnerabilities in web applications. The risk is amplified in environments where the web application has elevated privileges or where sensitive data is stored in accessible locations within the file system.
Mitigation strategies for CVE-2008-4483 must address both the immediate vulnerability and broader security practices within the application environment. The most effective immediate solution involves upgrading to a patched version of Crux Gallery that properly validates and sanitizes user input before processing. Administrators should ensure that the magic_quotes_gpc directive is enabled in PHP configurations, although this is considered a temporary measure as it may be deprecated in newer PHP versions. Implementing proper input validation and sanitization techniques, including the use of allowlists for theme parameters, can prevent malicious traversal sequences from being processed. Web application firewalls should be configured to detect and block suspicious path traversal patterns, particularly those containing double dots or other traversal sequences. Additionally, the principle of least privilege should be enforced by running the web application with minimal required permissions and ensuring that sensitive files are stored outside the web root directory. System administrators should also implement proper logging and monitoring to detect potential exploitation attempts, as the vulnerability's impact can be significant enough to compromise entire web server environments. Regular security audits and vulnerability assessments should be conducted to identify similar weaknesses in other applications and systems within the organization's infrastructure.