CVE-2005-2892 in PBLang
Summary
by MITRE
Directory traversal vulnerability in setcookie.php in PBLang 4.65, and possibly earlier versions, allows remote attackers to read arbitrary files via ".." sequences and "%00" (trailing null byte) in the u parameter.
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Analysis
by VulDB Data Team • 09/14/2025
The directory traversal vulnerability identified in CVE-2005-2892 affects PBLang version 4.65 and potentially earlier releases, representing a critical security flaw that enables remote attackers to access arbitrary files on the affected system. This vulnerability specifically resides within the setcookie.php script, which serves as a component for managing user cookies within the PBLang platform. The flaw manifests when the application fails to properly validate user input passed through the u parameter, creating an opportunity for attackers to manipulate file access paths through carefully crafted malicious input sequences.
The technical exploitation of this vulnerability relies on two primary attack vectors: the ".." directory traversal sequences and the "%00" trailing null byte technique. When an attacker submits input containing these elements through the u parameter, the application processes the request without adequate sanitization, allowing the traversal logic to navigate outside the intended directory structure. The ".." sequences enable attackers to move up directory levels, potentially accessing files outside the web root or designated application directories. The null byte injection further complicates the attack by potentially terminating string processing in the application, allowing the traversal to bypass certain validation mechanisms. This combination creates a powerful attack vector that can lead to unauthorized file access, including sensitive configuration files, database credentials, and potentially system files that should remain protected from user access.
The operational impact of this vulnerability extends beyond simple file access, as it can provide attackers with access to sensitive information that may include database connection strings, administrative credentials, or application configuration details. The consequences can range from data theft and information disclosure to potential system compromise, depending on what files are accessible through the traversal. Attackers could potentially read php files that contain database credentials, configuration settings, or other sensitive information that could facilitate further attacks. The vulnerability also represents a significant risk to application integrity, as it allows for arbitrary file reading that could be used to gather intelligence about the system or application structure, potentially leading to more sophisticated attacks such as code injection or privilege escalation.
Security professionals should consider this vulnerability in the context of CWE-22, which specifically addresses directory traversal flaws, and aligns with ATT&CK technique T1083 for discovering files and directories. The vulnerability demonstrates poor input validation practices that violate fundamental security principles and should be addressed through immediate patching of affected systems. Organizations should implement proper input sanitization measures, including strict validation of all user-supplied input, particularly parameters used in file access operations. The recommended mitigations include implementing proper path validation, using allowlists for acceptable file paths, and ensuring that applications do not process directory traversal sequences in user input. Additionally, system administrators should conduct thorough vulnerability assessments to identify other potentially affected components and ensure that all applications are updated to versions that address this specific vulnerability. The remediation process should also include monitoring for exploitation attempts and implementing network-level controls to detect and block suspicious traffic patterns associated with directory traversal attacks.