CVE-2023-3232 in CRMEB
Summary
by MITRE • 06/14/2023
A vulnerability was found in Zhong Bang CRMEB up to 4.6.0 and classified as critical. This issue affects some unknown processing of the file /api/wechat/app_auth of the component Image Upload. The manipulation leads to deserialization. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-231503. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 07/13/2023
The vulnerability identified as CVE-2023-3232 represents a critical security flaw in the Zhong Bang CRMEB platform version 4.6.0 and earlier. This vulnerability resides within the image upload functionality of the application's wechat app authentication component, specifically in the /api/wechat/app_auth endpoint. The flaw manifests during the processing of image uploads and creates a dangerous deserialization vulnerability that can be exploited by malicious actors. The vulnerability's classification as critical indicates the severe potential impact it has on the system's security posture, as it allows for arbitrary code execution and complete system compromise when exploited.
The technical implementation of this vulnerability involves unsafe deserialization practices within the image upload handling mechanism. When users upload images through the affected API endpoint, the application processes the uploaded files without proper validation of the data structure. This creates an opportunity for attackers to craft malicious payloads that, when deserialized by the vulnerable application, execute arbitrary code on the server. The vulnerability operates at the application layer and leverages the inherent risks associated with object deserialization in php applications, where untrusted input can be transformed into executable code. This type of vulnerability is commonly categorized under CWE-502 as "Deserialization of Untrusted Data" and aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: PowerShell" when attackers leverage such vulnerabilities for remote code execution.
The operational impact of this vulnerability extends beyond simple data compromise, as it provides attackers with complete control over the affected system. Successful exploitation can result in unauthorized access to sensitive data, complete system takeover, and potential lateral movement within the network. The public disclosure of this vulnerability increases the risk significantly, as it provides threat actors with detailed information about how to exploit the flaw without requiring advanced technical skills. Organizations running affected versions of CRMEB are particularly vulnerable since the vulnerability affects core authentication functionality, potentially allowing attackers to gain access to user accounts, administrative privileges, and sensitive business data. The lack of vendor response to early disclosure attempts compounds the risk, leaving affected organizations without official patches or mitigation guidance during the critical period following public disclosure.
Organizations affected by this vulnerability should immediately implement emergency mitigations while planning for official patches. The recommended approach includes restricting access to the vulnerable API endpoint through network segmentation and implementing strict input validation for all file uploads. Additionally, organizations should consider disabling the affected functionality entirely until proper patches are applied. Security controls should include monitoring for unusual file upload patterns and implementing web application firewalls to detect and block malicious deserialization attempts. The vulnerability's presence in the wechat app authentication component suggests that organizations should also review their integration points with external services and implement proper sandboxing techniques for all untrusted data processing. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other components of the application stack, particularly focusing on serialization handling and file upload mechanisms that may be susceptible to similar attacks.