CVE-2005-1996 in Bitrix Site Manager
Summary
by MITRE
PHP remote file inclusion vulnerability in start.php in Bitrix Site Manager 4.0.x allows remote attackers to execute arbitrary PHP code via the _SERVER[DOCUMENT_ROOT] parameter.
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Analysis
by VulDB Data Team • 07/24/2017
The CVE-2005-1996 vulnerability represents a critical remote file inclusion flaw in Bitrix Site Manager version 4.0.x that fundamentally undermines the security posture of affected systems. This vulnerability resides within the start.php script and specifically targets the _SERVER[DOCUMENT_ROOT] parameter, creating an exploitable pathway for malicious actors to inject and execute arbitrary PHP code on vulnerable servers. The flaw stems from inadequate input validation and sanitization mechanisms that fail to properly filter user-supplied data before incorporating it into server-side operations, thereby enabling attackers to manipulate the application's execution flow through crafted HTTP requests.
The technical exploitation of this vulnerability follows a well-established pattern within the realm of remote code execution attacks, where attackers craft malicious requests that manipulate the DOCUMENT_ROOT server variable to include external PHP files. This type of vulnerability falls under the CWE-98 category of "Improper Input Validation" and specifically aligns with ATT&CK technique T1190 "Exploit Public-Facing Application" within the execution phase of the attack chain. The vulnerability's impact is particularly severe because it allows attackers to bypass traditional security controls and execute code with the privileges of the web server process, potentially leading to full system compromise and persistent access.
The operational implications of this vulnerability extend beyond immediate code execution capabilities to encompass broader security implications for web applications and infrastructure. Organizations running affected Bitrix Site Manager versions face significant risk of unauthorized access, data breaches, and potential lateral movement within their networks. The vulnerability's remote nature means that attackers do not require physical access or prior authentication to exploit the flaw, making it particularly dangerous in publicly accessible environments. Security teams must consider that successful exploitation could result in the installation of backdoors, data exfiltration, and the establishment of persistent command and control channels that could remain undetected for extended periods.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening measures. The most effective immediate solution involves applying the vendor-supplied security patches or upgrading to supported versions of Bitrix Site Manager that have addressed this flaw. Additionally, implementing proper input validation and sanitization practices, such as those recommended in OWASP Top Ten security guidelines, can help prevent similar vulnerabilities from emerging in the future. Network-level protections including web application firewalls and strict access controls should be deployed to monitor and restrict access to potentially vulnerable application components. Organizations should also implement comprehensive monitoring and logging mechanisms to detect suspicious activities that may indicate exploitation attempts, while establishing regular security assessments to identify and remediate similar vulnerabilities across their entire application portfolio.