CVE-2007-4524 in PhPress
Summary
by MITRE
PHP remote file inclusion vulnerability in adisplay.php in PhPress 0.2.0 allows remote attackers to execute arbitrary PHP code via a URL in the lang parameter.
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Analysis
by VulDB Data Team • 10/06/2024
The vulnerability described in CVE-2007-4524 represents a critical remote file inclusion flaw in the PhPress content management system version 0.2.0. This issue specifically affects the adisplay.php script which fails to properly validate or sanitize user input parameters, creating an avenue for malicious actors to inject and execute arbitrary PHP code on the target server. The vulnerability stems from the application's improper handling of the lang parameter, which is directly incorporated into the script without adequate security controls. This type of vulnerability falls under the category of insecure direct object references and represents a classic example of how inadequate input validation can lead to remote code execution. The flaw allows attackers to manipulate the application's behavior by providing a malicious URL through the lang parameter, effectively bypassing normal security boundaries and gaining unauthorized access to the server's execution environment.
The technical exploitation of this vulnerability occurs when an attacker crafts a specially formatted URL and passes it as the lang parameter value to the adisplay.php script. The application then processes this input without proper sanitization, treating it as a legitimate file path or URL that can be included and executed within the PHP runtime environment. This creates a scenario where arbitrary PHP code can be executed on the server with the privileges of the web application, potentially allowing attackers to establish persistent access, escalate privileges, or perform other malicious activities. The vulnerability directly maps to CWE-98 which describes improper input validation in the context of file inclusion attacks, and aligns with ATT&CK technique T1190 for exploitation of remote services through web application vulnerabilities. The lack of proper parameter validation means that the application accepts any input that appears to be a valid URL, creating an attack surface that can be leveraged for various malicious purposes including data exfiltration, system compromise, or deployment of additional malware.
The operational impact of this vulnerability extends beyond immediate code execution capabilities to encompass broader security implications for the affected system. Once exploited, attackers can gain complete control over the web server hosting PhPress, potentially leading to data breaches, service disruption, or the establishment of backdoors for continued access. The vulnerability affects not only the integrity of the application but also the overall security posture of the hosting environment, as compromised web applications often serve as entry points for further lateral movement within networks. Organizations running affected versions of PhPress face significant risk of unauthorized access and potential system compromise, especially if the web server has elevated privileges or if the application has access to sensitive data repositories. This vulnerability represents a critical security gap that can be exploited by automated scanning tools, making it particularly dangerous in environments where systems are not properly monitored or updated. The impact is further amplified by the fact that such vulnerabilities are often discovered and exploited by threat actors who may have already identified and weaponized similar flaws in other systems, increasing the likelihood of successful exploitation in the wild.
Mitigation strategies for CVE-2007-4524 require immediate action to address the root cause through proper input validation and sanitization. The most effective approach involves implementing strict parameter validation that rejects any input not explicitly defined as acceptable, particularly for parameters that are used in file inclusion operations. Organizations should disable the ability to include remote files through user-controllable parameters and instead implement a whitelist of allowed values for the lang parameter. The application should be updated to the latest version of PhPress that contains proper security patches, or alternatively, the vulnerable script should be modified to properly sanitize all input before processing. Security controls should include disabling remote file inclusion features in PHP configuration, implementing proper access controls for web application files, and establishing monitoring mechanisms to detect suspicious file inclusion attempts. Network-level protections such as web application firewalls can provide additional defense-in-depth measures, while regular security assessments and vulnerability scanning should be conducted to identify similar flaws in other applications. This vulnerability serves as a reminder of the critical importance of input validation in web applications and the potential consequences of failing to implement proper security controls, particularly in legacy systems that may not have received adequate security updates.