CVE-2006-3850 in Vanilla
Summary
by MITRE
** DISPUTED ** PHP remote file inclusion vulnerability in upgrader.php in Vanilla CMS 1.0.1 and earlier, when /conf/old_settings.php exists, allows remote attackers to execute arbitrary PHP code via a URL in the RootDirectory parameter. NOTE: this issue has been disputed by a third party who states that the RootDirectory parameter is initialized before being used, for version 1.0. CVE analysis concurs with the dispute, but it is unclear whether older versions are affected.
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Analysis
by VulDB Data Team • 08/07/2024
The vulnerability described in CVE-2006-3850 represents a potential remote file inclusion flaw within Vanilla CMS version 1.0.1 and earlier systems. This issue specifically targets the upgrader.php component and occurs under particular conditions where the /conf/old_settings.php file exists within the system configuration. The vulnerability arises from the improper handling of user-supplied input through the RootDirectory parameter, which when manipulated by remote attackers could potentially lead to arbitrary code execution. The technical nature of this flaw aligns with common remote code execution vulnerabilities that have been extensively documented in security literature and categorized under CWE-88, which describes improper neutralization of special elements used in an OS command.
The operational impact of this vulnerability extends beyond simple code execution capabilities, as it could potentially allow attackers to gain unauthorized access to the affected system. The condition requiring the existence of /conf/old_settings.php before exploitation suggests that this vulnerability may be more situational than widespread, though the potential for privilege escalation and system compromise remains significant. Attackers could leverage this vulnerability to upload malicious files, execute commands, or establish persistent access to the web server hosting the vulnerable Vanilla CMS installation. The fact that this vulnerability was disputed by a third party who questioned the validity of the RootDirectory parameter initialization further complicates the assessment and highlights the importance of thorough verification of reported security issues.
Security practitioners should consider this vulnerability within the context of broader remote file inclusion attack patterns that align with techniques documented in the MITRE ATT&CK framework under the execution and privilege escalation domains. The disputed nature of this CVE indicates that the vulnerability assessment may require deeper analysis of the specific code implementation and version-specific behavior. Organizations should verify their Vanilla CMS installations against the exact version mentioned in the vulnerability description and ensure proper input validation mechanisms are in place. The vulnerability underscores the critical importance of validating all user inputs and implementing proper access controls to prevent unauthorized file operations, particularly in upgrade and configuration management components where system-level operations are performed.
The disputed status of this CVE emphasizes the need for security professionals to independently verify vulnerability claims and not rely solely on reported descriptions. While the vulnerability may not affect all versions as initially described, the potential for exploitation in older versions remains a concern that requires careful consideration. System administrators should conduct thorough vulnerability assessments of their Vanilla CMS installations, ensuring that proper patching procedures are followed and that all system components are updated to versions that have been verified as secure. The incident also highlights the importance of maintaining detailed documentation of system configurations and the conditions under which vulnerabilities may manifest, as this information proves crucial for effective incident response and security posture improvement.