CVE-2008-0542 in Simple Forum
Summary
by MITRE
Directory traversal vulnerability in thumbnail.php in Gerd Tentler Simple Forum 3.2 allows remote attackers to read arbitrary files via a .. (dot dot) in the file parameter.
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Analysis
by VulDB Data Team • 10/15/2024
The vulnerability identified as CVE-2008-0542 represents a critical directory traversal flaw within the Gerd Tentler Simple Forum 3.2 web application. This security weakness resides in the thumbnail.php component which fails to properly validate user input parameters, specifically the file parameter that controls which files are processed for thumbnail generation. The vulnerability enables malicious actors to manipulate the file parameter by injecting directory traversal sequences such as .. to navigate outside the intended directory structure and access arbitrary files on the server filesystem. This type of vulnerability falls under the category of CWE-22 - Improper Limitation of a Pathname to a Restricted Directory and is classified as a remote code execution risk when combined with other exploitation techniques.
The technical implementation of this vulnerability stems from inadequate input sanitization and validation within the thumbnail.php script. When users provide file names through the file parameter, the application does not properly restrict or filter the input to prevent directory traversal sequences from being processed. Attackers can exploit this by crafting malicious URLs that include sequences like ../../../etc/passwd or similar patterns that would normally be blocked by proper path validation. The vulnerability specifically affects the Simple Forum 3.2 version, indicating that this was likely an issue present in older codebases that failed to implement proper security controls for file operations. This weakness aligns with ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment, where attackers might leverage such vulnerabilities to gain unauthorized access to sensitive files and potentially escalate privileges.
The operational impact of this vulnerability extends beyond simple file disclosure, as it can provide attackers with access to critical system files, configuration data, and potentially sensitive user information stored on the server. An attacker could potentially read database configuration files, application source code, user credentials, or other sensitive data that could lead to further compromise of the system. The remote nature of this vulnerability means that attackers do not require local system access or authentication to exploit it, making it particularly dangerous in publicly accessible web applications. This vulnerability could also serve as a stepping stone for more advanced attacks, allowing threat actors to gather information about the system architecture and identify additional vulnerabilities that could be exploited for complete system compromise.
Mitigation strategies for this vulnerability should include immediate patching of the Simple Forum application to a version that properly validates and sanitizes file input parameters. Organizations should implement input validation controls that explicitly reject directory traversal sequences and other malicious input patterns. The implementation of proper access controls and file permission settings can help limit the damage even if the vulnerability is exploited. Additionally, web application firewalls and intrusion detection systems can be configured to detect and block requests containing directory traversal patterns. Security teams should also conduct comprehensive code reviews to identify similar vulnerabilities in other applications and implement proper secure coding practices that prevent such issues from occurring in future development cycles. The remediation process should follow industry standards including OWASP Top Ten security guidelines and NIST cybersecurity frameworks to ensure comprehensive protection against similar vulnerabilities.