CVE-2007-3522 in sPHPell
Summary
by MITRE
Multiple PHP remote file inclusion vulnerabilities in sPHPell 1.01 allow remote attackers to execute arbitrary PHP code via a URL in the SpellIncPath parameter to (1) spellcheckpageinc.php, (2) spellchecktext.php, (3) spellcheckwindow.php, or (4) spellcheckwindowframeset.php.
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Analysis
by VulDB Data Team • 09/24/2024
The vulnerability identified as CVE-2007-3522 represents a critical remote file inclusion flaw within the sPHPell 1.01 spell checking component that operates within PHP environments. This vulnerability resides in the application's handling of user-supplied input through the SpellIncPath parameter, which is processed across four distinct PHP script files including spellcheckpageinc.php, spellchecktext.php, spellcheckwindow.php, and spellcheckwindowframeset.php. The flaw stems from insufficient input validation and sanitization mechanisms that fail to properly restrict the paths that can be included, creating an avenue for malicious actors to inject and execute arbitrary PHP code on the target server.
From a technical perspective this vulnerability aligns with CWE-88, which describes improper neutralization of special elements used in an expression, specifically in the context of remote file inclusion attacks. The vulnerability operates through a classic path traversal pattern where attacker-controlled input directly influences the include_path parameter, allowing for the inclusion of remote files from external domains. The affected PHP scripts demonstrate a lack of proper parameter validation, enabling attackers to manipulate the SpellIncPath variable to point to malicious remote resources instead of legitimate local files. This weakness effectively transforms the spell checking functionality into a vector for arbitrary code execution, as the PHP interpreter processes and executes any code present in the included remote files.
The operational impact of this vulnerability extends beyond simple code execution, encompassing complete system compromise and potential data exfiltration. Attackers can leverage this vulnerability to establish persistent backdoors, escalate privileges, and access sensitive system information. The remote nature of the attack means that exploitation can occur from any location without requiring physical access to the target system, making it particularly dangerous for web applications that are publicly accessible. The vulnerability's presence in multiple files within the sPHPell component increases the attack surface, providing multiple entry points for potential exploitation and reducing the likelihood of detection through simple signature-based monitoring.
Security practitioners should implement comprehensive mitigations including immediate patching of the sPHPell 1.01 component to address the input validation deficiencies. The recommended approach involves implementing strict input validation that rejects any non-local file paths and employs proper parameter sanitization techniques before any file inclusion operations are performed. Organizations should also consider implementing web application firewalls with rules specifically designed to detect and block suspicious include_path parameters. The vulnerability demonstrates the importance of secure coding practices and input validation as outlined in the OWASP Top Ten, particularly addressing the risk of remote code execution through improper input handling. Additionally, implementing principle of least privilege access controls and regular security assessments can help prevent exploitation of similar vulnerabilities in other components of the application stack. The ATT&CK framework categorizes this vulnerability under T1190 - Exploit Public-Facing Application, highlighting the need for organizations to maintain robust application security postures and conduct regular vulnerability assessments to identify and remediate similar weaknesses in their software components.