CVE-2008-4346 in TalkBack
Summary
by MITRE
Directory traversal vulnerability in TalkBack 2.3.6 and 2.3.6.4 allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the language parameter to comments.php, a different vector than CVE-2008-3371.
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Analysis
by VulDB Data Team • 11/04/2024
The vulnerability described in CVE-2008-4346 represents a critical directory traversal flaw affecting TalkBack versions 2.3.6 and 2.3.6.4. This security weakness enables remote attackers to manipulate the application's file handling mechanisms by exploiting improper input validation in the language parameter of the comments.php script. The vulnerability specifically leverages the .. (dot dot) sequence to navigate upward through the directory structure, allowing unauthorized access to local files that should remain protected from external interrogation. This issue differs from CVE-2008-3371 in its attack vector, as it targets the language parameter rather than other input points within the application's interface. The flaw resides in the application's failure to properly sanitize user-supplied input before using it in file system operations, creating an opportunity for attackers to bypass normal access controls and potentially execute malicious code or retrieve sensitive system information.
The technical implementation of this vulnerability involves the manipulation of the language parameter to exploit weak input validation mechanisms within TalkBack's comments.php file. When a user submits a request containing a .. sequence in the language parameter, the application processes this input without adequate sanitization or verification of the intended file path. This allows attackers to traverse the file system hierarchy and access files that are not meant to be publicly available. The vulnerability falls under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The flaw demonstrates a classic lack of input validation and output encoding that permits malicious users to manipulate file access patterns and potentially gain unauthorized access to system resources. Attackers can leverage this weakness to include and execute arbitrary local files, potentially leading to complete system compromise or data exfiltration.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass potential system compromise and unauthorized code execution. Remote attackers can exploit this flaw to access sensitive system files, configuration data, and potentially execute malicious payloads on the affected server. The implications are particularly severe because the vulnerability allows for arbitrary file inclusion, which can be combined with other attack vectors to achieve more sophisticated compromises. Organizations running affected versions of TalkBack face significant risk of unauthorized access to their systems, especially if the application is deployed in environments where sensitive data is stored. The vulnerability's remote exploitability means that attackers do not require physical access to the system, making it particularly dangerous for web-facing applications. This weakness can also enable attackers to escalate privileges or establish persistent access to compromised systems, as the ability to include arbitrary files provides multiple pathways for maintaining control over the affected infrastructure.
Mitigation strategies for CVE-2008-4346 should prioritize immediate patching of affected TalkBack installations to the latest available versions that address this directory traversal vulnerability. Organizations must implement robust input validation mechanisms that reject or sanitize any input containing directory traversal sequences such as .. or %2e%2e. The implementation of proper access controls and privilege separation ensures that even if an attacker succeeds in exploiting the vulnerability, they cannot access files beyond their intended scope. Security measures should include disabling unnecessary file inclusion capabilities, implementing proper file system permissions, and conducting regular security audits of web applications to identify similar vulnerabilities. Network segmentation and intrusion detection systems can help monitor for exploitation attempts, while web application firewalls should be configured to block suspicious requests containing directory traversal sequences. The remediation process should also involve comprehensive testing to ensure that patches do not introduce compatibility issues with existing functionality, and organizations should establish incident response procedures to handle potential exploitation attempts. Regular vulnerability assessments and security training for developers can help prevent similar issues in future software deployments, emphasizing the importance of proper input validation and secure coding practices as outlined in industry standards such as the OWASP Top Ten and NIST cybersecurity guidelines.