CVE-2011-3769 in PHPads
Summary
by MITRE
PHPads 2.0 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by ads.inc.php.
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Analysis
by VulDB Data Team • 02/10/2019
The vulnerability identified as CVE-2011-3769 affects PHPads 2.0, a web-based advertising management system that was widely used for displaying advertisements on websites. This issue represents a classic information disclosure vulnerability that exposes sensitive system details to unauthorized users. The flaw specifically manifests when remote attackers can directly access .php files within the application's directory structure, particularly targeting the ads.inc.php file which serves as a critical component in the advertising framework. The vulnerability stems from improper error handling mechanisms within the application's codebase, where error messages are generated without adequate sanitization or access control measures.
The technical implementation of this vulnerability involves the application's failure to properly validate and restrict access to its internal PHP files. When a direct request is made to a vulnerable .php file such as ads.inc.php, the system generates an error message that inadvertently includes the full server path where the application is installed. This occurs because the application's error reporting mechanism lacks proper input validation and access restriction controls. The error message contains the absolute path to the installation directory, which can include sensitive information about the server environment, file structure, and potentially even the operating system configuration. This exposure of installation paths represents a significant security risk as it provides attackers with valuable reconnaissance information that can be used for subsequent exploitation attempts.
From an operational perspective, this vulnerability creates multiple security implications for organizations using PHPads 2.0. The disclosure of installation paths can enable attackers to craft more targeted attacks against the system, as they now have knowledge of the application's file structure and potential attack vectors. This information can be leveraged to identify other potential vulnerabilities within the same system, such as weak file permissions, exposed configuration files, or other sensitive directories that might be accessible through the same attack vector. The vulnerability also aligns with CWE-200, which categorizes information exposure flaws, and represents a direct violation of secure coding practices that emphasize proper error handling and access control. The impact extends beyond simple information disclosure as it can serve as a stepping stone for more sophisticated attacks, including directory traversal attempts or privilege escalation exploits that might be possible given the exposed path information.
The attack surface for this vulnerability is significant since it affects the core functionality of the advertising system and can be exploited by any remote attacker with basic network access. The exploitation process requires minimal technical skill, making it particularly dangerous as it can be automated and used in large-scale scanning operations. The vulnerability demonstrates a fundamental flaw in the application's security architecture where the distinction between internal application files and publicly accessible resources is not properly enforced. Organizations using this version of PHPads are particularly vulnerable because the application was designed without adequate security considerations for error handling and path disclosure prevention. The issue also relates to ATT&CK technique T1212, which involves exploitation of software vulnerabilities for information gathering purposes.
Mitigation strategies for this vulnerability should include immediate patching of the PHPads 2.0 application to the latest available version that addresses the information disclosure flaw. Organizations should implement proper access controls that prevent direct access to internal PHP files through web server configuration, using .htaccess rules or similar mechanisms to restrict access to sensitive files. Additionally, the application should be configured to disable detailed error messages in production environments, implementing custom error handlers that do not expose sensitive system information. Server hardening measures should include proper file permissions, removal of unnecessary files, and implementation of web application firewalls to monitor and block suspicious access patterns. The vulnerability highlights the importance of following secure coding practices and implementing proper input validation, which aligns with security standards such as those outlined in the OWASP Top Ten and the ISO 27001 security framework for information security management.