CVE-2008-4911 in Istant-Replay
Summary
by MITRE
PHP remote file inclusion vulnerability in read.php in Chattaitaliano Istant-Replay allows remote attackers to execute arbitrary PHP code via a URL in the data parameter.
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Analysis
by VulDB Data Team • 07/24/2025
The CVE-2008-4911 vulnerability represents a critical remote file inclusion flaw in the Chattaitaliano Istant-Replay application's read.php component. This vulnerability stems from improper input validation and sanitization practices within the application's parameter handling mechanism. The flaw specifically affects the data parameter which is processed without adequate security controls, allowing malicious actors to inject external URLs that the application subsequently includes and executes as PHP code. The vulnerability operates at the application layer and demonstrates a classic path traversal and code execution pattern that has been documented across numerous web applications over the years.
The technical implementation of this vulnerability occurs when the read.php script accepts user-supplied input through the data parameter and directly incorporates it into file inclusion operations without proper validation or sanitization. This creates an environment where remote attackers can craft malicious URLs containing PHP code that gets executed within the context of the web server. The vulnerability falls under the category of CWE-88, which describes improper neutralization of special elements used in an expression, specifically highlighting the dangerous practice of directly incorporating user input into dynamic code execution contexts. The flaw essentially allows attackers to bypass normal application security boundaries and execute arbitrary commands on the affected server.
From an operational impact perspective, this vulnerability provides attackers with complete control over the affected system, enabling them to execute arbitrary PHP code, access sensitive data, modify application behavior, and potentially establish persistent backdoors. The remote nature of the attack means that exploitation can occur from anywhere on the internet without requiring physical access to the target system. Attackers can leverage this vulnerability to deploy web shells, exfiltrate database credentials, compromise other systems within the network, and perform various malicious activities. The vulnerability also aligns with ATT&CK technique T1190, which describes the use of remote services to gain initial access, and T1059, which covers the execution of commands through various payloads. The impact extends beyond immediate code execution to include potential data breaches, system compromise, and service disruption.
Mitigation strategies for this vulnerability require immediate implementation of input validation and sanitization controls within the application code. The primary remediation involves modifying the read.php script to validate and sanitize all input parameters before processing, particularly the data parameter. This includes implementing proper parameter validation that rejects suspicious URL patterns and ensuring that only trusted, local file paths are accepted for inclusion operations. Organizations should also implement proper web application firewall rules to detect and block malicious URL patterns targeting this vulnerability. Additionally, the application should be updated to use secure coding practices that prevent dynamic code execution based on user input, aligning with secure coding guidelines from organizations like OWASP. Regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other application components, ensuring that the application follows secure development lifecycle practices to prevent future occurrences of such critical flaws.