CVE-2007-5995 in patBBcode
Summary
by MITRE
PHP remote file inclusion vulnerability in examples/patExampleGen/bbcodeSource.php in patBBcode 1.0 allows remote attackers to execute arbitrary PHP code via a URL in the example parameter.
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Analysis
by VulDB Data Team • 10/10/2024
The vulnerability identified as CVE-2007-5995 represents a critical remote file inclusion flaw within the patBBcode 1.0 library, specifically affecting the bbcodeSource.php script located in the examples/patExampleGen directory. This vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly restrict user-supplied data from being directly incorporated into file inclusion operations. The flaw manifests when the application accepts a URL through the example parameter without sufficient validation, creating an avenue for malicious actors to inject arbitrary PHP code execution directives.
The technical exploitation of this vulnerability occurs through a straightforward mechanism where an attacker crafts a malicious URL containing PHP code and passes it as the example parameter to the vulnerable script. The patBBcode library's implementation fails to sanitize this input before using it in file inclusion operations, allowing the remote attacker to execute arbitrary PHP code on the target system. This vulnerability directly maps to CWE-88, which describes the improper validation of critical control elements, and specifically relates to CWE-94, encompassing the execution of arbitrary code due to insufficient input sanitization. The attack vector operates through the PHP include or require functions, which when fed with unvalidated user input, execute the malicious code as part of the application's normal processing flow.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete control over the affected system. Successful exploitation enables remote code execution capabilities that can lead to full system compromise, data exfiltration, and persistence mechanisms. Attackers can leverage this vulnerability to install backdoors, escalate privileges, or use the compromised system as a launch point for further attacks within the network infrastructure. The vulnerability affects systems running patBBcode 1.0 and any applications that utilize this library without proper input validation. This creates a significant risk for web applications that depend on third-party libraries, as the vulnerability can be exploited to gain unauthorized access to sensitive data and system resources.
Mitigation strategies for CVE-2007-5995 must address both immediate remediation and long-term architectural improvements. The most effective immediate solution involves implementing strict input validation and sanitization mechanisms that prevent user-supplied data from being directly used in file inclusion operations. This includes using allowlists of trusted parameters, implementing proper URL validation, and ensuring that any user-provided input undergoes rigorous sanitization before processing. Organizations should also consider implementing the principle of least privilege by restricting file inclusion operations to predefined, trusted locations. The remediation approach aligns with ATT&CK technique T1059.007, which covers the execution of remote code through web shells and file inclusion vulnerabilities. Additionally, regular security audits and code reviews should be conducted to identify similar patterns in other third-party libraries and application components. System administrators should also implement proper logging and monitoring to detect anomalous file inclusion patterns that may indicate exploitation attempts, ensuring comprehensive defense-in-depth strategies that address both the immediate vulnerability and potential future similar issues.