CVE-2006-4898 in Guanxicrm Business Solution
Summary
by MITRE
PHP remote file inclusion vulnerability in include/phpxd/phpXD.php in guanxiCRM 0.9.1 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the appconf[rootpath] parameter.
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Analysis
by VulDB Data Team • 12/20/2024
The vulnerability identified as CVE-2006-4898 represents a critical remote file inclusion flaw within the guanxiCRM 0.9.1 software suite and earlier versions. This vulnerability exists in the phpXD.php file located within the include/phpxd directory structure of the application. The flaw stems from inadequate input validation and sanitization mechanisms that fail to properly restrict user-supplied data from being directly incorporated into file inclusion operations. Attackers can exploit this weakness by manipulating the appconf[rootpath] parameter to inject malicious URLs that point to remote PHP scripts, thereby enabling arbitrary code execution on the target server.
The technical nature of this vulnerability aligns with CWE-88, which describes improper neutralization of special elements used in an expression, specifically in the context of command and directory traversal attacks. This weakness allows attackers to manipulate the application's file inclusion mechanism to load and execute arbitrary PHP code from remote locations. The vulnerability operates at the application level and demonstrates a classic path traversal and remote code execution pattern that has been prevalent in web applications since the early days of php-based systems. The flaw essentially bypasses the intended security boundaries of the application by permitting external content to be seamlessly integrated into the application's execution flow.
The operational impact of this vulnerability is severe and far-reaching, as it provides attackers with complete control over the affected server environment. Once exploited, an attacker can execute arbitrary commands with the privileges of the web server process, potentially leading to full system compromise. The vulnerability enables attackers to upload malicious files, establish persistent backdoors, and access sensitive data stored within the application. This type of vulnerability is particularly dangerous because it can be exploited without requiring authentication, making it an attractive target for automated scanning tools and malicious actors seeking to compromise web applications at scale. The attack vector is straightforward and does not require complex exploitation techniques, making it highly accessible to attackers of varying skill levels.
Mitigation strategies for this vulnerability should focus on immediate patching and implementation of input validation controls. Organizations should upgrade to the latest version of guanxiCRM where this vulnerability has been addressed through proper parameter sanitization and validation. The recommended approach involves implementing strict input validation that rejects any URLs containing suspicious patterns or external references. Additionally, the application should be configured to disable remote file inclusion features entirely and restrict file operations to local paths only. Security measures should include implementing proper access controls, disabling dangerous PHP functions such as allow_url_include, and deploying web application firewalls to detect and block malicious requests targeting this specific vulnerability pattern. The mitigation approach should also incorporate regular security assessments and code reviews to identify similar weaknesses in other parts of the application codebase, aligning with ATT&CK technique T1190 for exploiting vulnerabilities in web applications and T1059 for command and scripting interfaces.