CVE-2008-0822 in Scribe
Summary
by MITRE
Directory traversal vulnerability in index.php in Scribe 0.2 allows remote attackers to read arbitrary local files via a .. (dot dot) in the page parameter.
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Analysis
by VulDB Data Team • 10/17/2024
The vulnerability identified as CVE-2008-0822 represents a classic directory traversal flaw within the Scribe 0.2 web application, specifically affecting the index.php script. This issue stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied parameters before processing them within the application's file system operations. The vulnerability manifests when the page parameter receives input containing directory traversal sequences such as .. which allows attackers to navigate outside the intended directory structure and access arbitrary local files on the server.
From a technical perspective, the flaw operates by exploiting insufficient validation of the page parameter in the index.php file, which directly incorporates user input into file system operations without proper sanitization or restriction. When a malicious user submits a crafted payload containing .. sequences in the page parameter, the application processes these inputs without adequate checks, enabling unauthorized access to files outside the designated web root or application directory. This vulnerability falls under the category of CWE-22, 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 information disclosure, as it provides attackers with the ability to access sensitive files that may contain database credentials, configuration settings, application source code, or other confidential information. An attacker could potentially exploit this vulnerability to retrieve system files such as /etc/passwd or /etc/shadow on Unix-like systems, or access Windows system files and configuration data. The remote nature of this attack means that exploitation does not require local system access, making it particularly dangerous as it can be leveraged from any network location. According to ATT&CK framework, this vulnerability maps to T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachment) as attackers can use the discovered information to craft more sophisticated attacks.
Mitigation strategies for CVE-2008-0822 should focus on implementing proper input validation and sanitization mechanisms that prevent directory traversal sequences from being processed. The most effective approach involves implementing a whitelist-based validation system that only accepts predetermined, safe values for the page parameter, rather than allowing arbitrary input. Additionally, applications should employ proper path resolution techniques that normalize and validate file paths before any file system operations occur. Security measures should include implementing secure coding practices such as using absolute paths, restricting file access to specific directories, and employing proper error handling that does not reveal internal file system structure. Organizations should also consider implementing web application firewalls that can detect and block suspicious directory traversal patterns, and conduct regular security assessments to identify similar vulnerabilities in other components of their web applications. The remediation process requires immediate patching of the vulnerable Scribe 0.2 application or implementation of proper input validation mechanisms to prevent the exploitation of this directory traversal vulnerability.