CVE-2006-5523 in EZ-Ticket
Summary
by MITRE
PHP remote file inclusion vulnerability in common.php in EZ-Ticket 0.0.1 allows remote attackers to execute arbitrary PHP code via a URL in the ezt_root_path parameter.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability identified as CVE-2006-5523 represents a critical remote file inclusion flaw in the EZ-Ticket 0.0.1 web application, specifically within the common.php script. This vulnerability falls under the category of insecure direct object references and improper input validation, creating a pathway for remote attackers to execute arbitrary code on the target system. The flaw manifests when the application fails to properly validate or sanitize the ezt_root_path parameter, allowing malicious actors to inject malicious URLs that are then included and executed as PHP code. This type of vulnerability is particularly dangerous as it enables attackers to escalate their privileges and potentially gain complete control over the affected server.
The technical implementation of this vulnerability stems from the application's improper handling of user-supplied input within the include statement. When the ezt_root_path parameter is passed to the common.php script without adequate sanitization, the application directly incorporates the provided value into a file inclusion directive. This creates a scenario where an attacker can supply a URL pointing to a remote malicious PHP script, which gets executed on the target server with the privileges of the web application. The vulnerability is classified as a CWE-98 weakness, specifically related to improper input validation leading to remote code execution through file inclusion mechanisms. This aligns with the ATT&CK framework's technique T1190, which describes the use of remote access tools and malicious code execution through web application vulnerabilities.
The operational impact of this vulnerability extends far beyond simple code execution, as it provides attackers with a foothold for further exploitation within the target environment. Once an attacker successfully exploits this vulnerability, they can establish persistent access through backdoor scripts, escalate privileges to system-level access, and potentially use the compromised server as a launchpad for attacking other systems within the network. The vulnerability affects the integrity and confidentiality of the web application and underlying system, as attackers can read sensitive data, modify application behavior, and potentially exfiltrate information. Organizations running affected versions of EZ-Ticket face significant risk of data breaches, system compromise, and potential regulatory violations due to the exposure of sensitive information through this remote code execution vulnerability.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening measures. The most effective immediate solution involves updating to a patched version of EZ-Ticket that properly validates and sanitizes all user input before processing. Organizations should implement input validation measures that reject any non-local file paths or URLs that do not conform to expected patterns. Additionally, disabling remote file inclusion capabilities within PHP configurations and implementing proper access controls can significantly reduce the attack surface. Security teams should also consider implementing web application firewalls to detect and block malicious requests attempting to exploit this vulnerability. The remediation process should include thorough code reviews to identify similar patterns in other applications and establish secure coding practices that prevent similar vulnerabilities from being introduced in future development cycles.