CVE-2023-1713 in Bitrix24
Summary
by MITRE • 11/01/2023
Insecure temporary file creation in bitrix/modules/crm/lib/order/import/instagram.php in Bitrix24 22.0.300 hosted on Apache HTTP Server allows remote authenticated attackers to execute arbitrary code via uploading a crafted ".htaccess" file.
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Analysis
by VulDB Data Team • 11/29/2023
This vulnerability exists in the Bitrix24 content management system version 22.0.300 where insecure temporary file handling occurs during Instagram order import functionality. The flaw is located in the file bitrix/modules/crm/lib/order/import/instagram.php which processes uploaded files from Instagram integration. When authenticated users upload files through this module, the system creates temporary files without proper security controls, allowing attackers to manipulate the file creation process. This insecure temporary file creation pattern represents a classic security misconfiguration that aligns with CWE-377 - Insecure Temporary File creation and CWE-73 - External Control of File Name or Path. The vulnerability specifically affects Apache HTTP Server environments where the web server configuration may not properly restrict access to temporary file directories.
The technical exploitation occurs when a remote authenticated attacker uploads a specially crafted .htaccess file through the Instagram import functionality. This file manipulation exploits the insecure temporary file handling mechanism to place malicious configuration files in directories accessible to the web server. The .htaccess file can contain directives that allow arbitrary code execution or enable malicious file uploads, effectively bypassing normal security controls. The attack leverages the fact that temporary files created during the import process are not properly secured against malicious input, allowing attackers to inject web server configuration directives that can be executed by the Apache server. This represents a privilege escalation vulnerability since the attacker only needs authenticated access to the system, not administrative privileges. The attack chain follows the ATT&CK framework's privilege escalation techniques where attackers leverage insecure file handling to gain unauthorized execution capabilities.
The operational impact of this vulnerability is significant as it allows authenticated attackers to potentially execute arbitrary code on the affected Bitrix24 server. This could lead to complete system compromise, data exfiltration, or further lateral movement within the network. Organizations using Bitrix24 with Instagram integration are at risk, particularly those with less stringent access controls or where user accounts might be compromised through other means. The vulnerability affects the core CRM functionality and could disrupt business operations while providing attackers with persistent access to sensitive customer data. The security implications extend beyond immediate code execution to include potential data breach scenarios where attacker-controlled code could access or exfiltrate CRM data. Organizations should consider this vulnerability as a critical risk since it can be exploited remotely by authenticated users, potentially leading to unauthorized access to customer information and business-critical data stored within the Bitrix24 system.
Mitigation strategies should focus on immediate patching of the Bitrix24 platform to version 22.0.301 or later where this vulnerability has been addressed. Organizations should also implement additional security controls such as restricting file upload capabilities, implementing proper temporary file handling with secure permissions, and monitoring for unauthorized .htaccess file modifications. Network segmentation and access controls should be enforced to limit the potential impact of successful exploitation. Security teams should conduct thorough audits of temporary file handling mechanisms across all web applications and ensure proper file validation and sanitization. The implementation of web application firewalls and intrusion detection systems can help detect and prevent exploitation attempts. Additionally, organizations should review their user access controls and implement principle of least privilege to minimize the potential damage from compromised accounts. Regular security assessments and vulnerability scanning should be conducted to identify similar insecure temporary file handling patterns across the organization's technology stack.