CVE-2006-6867 in bubla
Summary
by MITRE
Multiple PHP remote file inclusion vulnerabilities in Vladimir Menshakov buratinable templator (aka bubla) 0.9.1 allow remote attackers to execute arbitrary PHP code via a URL in the bu_dir parameter to (1) bu/bu_claro.php, (2) bu/bu_cache.php, or (3) bu/bu_parse.php, different vectors and a different affected version than CVE-2006-6809.
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Analysis
by VulDB Data Team • 08/15/2024
The vulnerability identified as CVE-2006-6867 represents a critical remote code execution flaw within the buratinable templator (bubla) PHP library version 0.9.1. This vulnerability falls under the category of remote file inclusion attacks that exploit improper input validation mechanisms within web applications. The affected components include three distinct PHP scripts namely bu/bu_claro.php, bu/bu_cache.php, and bu/bu_parse.php, all of which accept user-supplied input through the bu_dir parameter without adequate sanitization or validation. The flaw stems from the library's failure to properly validate or escape user-provided directory paths, creating an opportunity for attackers to inject malicious URLs that are subsequently included and executed by the PHP interpreter.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL and passes it through the bu_dir parameter to any of the three vulnerable scripts. The PHP application processes this input without proper validation, leading to the inclusion of remote files from attacker-controlled servers. This remote file inclusion mechanism allows adversaries to execute arbitrary PHP code on the target server, effectively bypassing normal access controls and potentially gaining full administrative privileges. The vulnerability is particularly dangerous because it operates at the include/require level where PHP processes and executes code from external sources, making it a direct pathway for remote command execution and server compromise. This flaw aligns with CWE-88, which describes improper neutralization of special elements used in an expression, specifically in the context of command injection through file inclusion.
The operational impact of CVE-2006-6867 extends beyond simple code execution to encompass complete system compromise and data exfiltration capabilities. Attackers can leverage this vulnerability to establish persistent backdoors, deploy additional malware, or use the compromised server as a launch point for further attacks within the network infrastructure. The vulnerability's presence in multiple scripts increases the attack surface, providing several potential entry points for exploitation. Organizations using vulnerable versions of the buratinable templator library face significant risk of unauthorized access, data breaches, and potential service disruption. The attack vectors are particularly concerning because they can be executed through standard web requests without requiring authentication, making them accessible to any attacker with knowledge of the vulnerable application paths. This vulnerability directly maps to ATT&CK technique T1190, which describes the use of remote file inclusion to execute arbitrary code on target systems.
Mitigation strategies for CVE-2006-6867 must address both immediate remediation and long-term security posture improvements. The primary solution involves upgrading to a patched version of the buratinable templator library that properly validates and sanitizes input parameters before processing. Organizations should implement input validation controls that reject suspicious URL patterns and enforce strict parameter validation for all user-supplied inputs. Additionally, disabling remote file inclusion features in PHP configurations and using allow_url_include=off can prevent exploitation even if input validation fails. Network-level defenses should include intrusion detection systems that monitor for suspicious URL patterns and malformed requests targeting known vulnerable endpoints. Security teams should also implement proper application firewalls and web application security monitoring to detect and block exploitation attempts. The vulnerability highlights the importance of secure coding practices and input validation, particularly in libraries that handle user-provided data, aligning with security standards that emphasize the need for proper sanitization of all external inputs and the principle of least privilege in application design.