CVE-2025-0364 in BigAnt Server
Summary
by MITRE • 02/04/2025
BigAntSoft BigAnt Server, up to and including version 5.6.06, is vulnerable to unauthenticated remote code execution via account registration. An unauthenticated remote attacker can create an administrative user through the default exposed SaaS registration mechanism. Once an administrator, the attacker can upload and execute arbitrary PHP code using the "Cloud Storage Addin," leading to unauthenticated code execution.
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Analysis
by VulDB Data Team • 09/30/2025
The vulnerability identified as CVE-2025-0364 affects BigAntSoft BigAnt Server versions up to and including 5.6.06, presenting a critical security risk that allows unauthenticated remote code execution through the software's default SaaS registration mechanism. This flaw represents a severe misconfiguration that exposes the system to unauthorized access and potential full system compromise. The vulnerability stems from the server's failure to properly validate registration requests, enabling any remote attacker to create administrative accounts without authentication. This represents a fundamental breakdown in the software's access control mechanisms, creating a backdoor that bypasses normal authentication procedures.
The technical exploitation of this vulnerability begins with the attacker leveraging the exposed registration endpoint to create an administrative user account. This initial step exploits a lack of proper input validation and authentication checks during the user creation process. Once administrative privileges are obtained, the attacker can utilize the "Cloud Storage Addin" feature to upload and execute arbitrary PHP code on the server. This secondary exploitation vector demonstrates how the initial privilege escalation can be leveraged to achieve full code execution capabilities. The vulnerability aligns with CWE-862, which addresses insufficient authorization, and CWE-20, which covers improper input validation, both of which are critical components of the attack chain.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass complete system compromise and potential data exfiltration. An attacker with administrative privileges can manipulate system configurations, access sensitive user data, and establish persistent access through uploaded PHP payloads. The attack surface is particularly concerning because it operates entirely through standard network protocols without requiring any specialized tools or privileged information. This vulnerability affects organizations that rely on BigAnt Server for collaboration and file sharing, potentially exposing business-critical information and disrupting normal operations. The risk is amplified by the fact that the attack can be executed entirely remotely, making network-based detection and prevention challenging.
Organizations affected by this vulnerability should immediately implement mitigations including disabling or securing the exposed registration endpoint, applying available patches from BigAntSoft, and implementing network segmentation to limit access to the vulnerable system. Security controls should focus on monitoring for unusual registration activities and unauthorized administrative account creation. The vulnerability also highlights the importance of proper access control implementation and input validation in web applications. From an ATT&CK framework perspective, this vulnerability maps to T1190 (Exploit Public-Facing Application) and T1078 (Valid Accounts), demonstrating how initial access can be achieved through application exploitation followed by privilege escalation. Additionally, the ability to upload and execute PHP code represents a path to T1505.003 (Server Software Component) and T1059.007 (Command and Scripting Interpreter: PHP), further emphasizing the comprehensive nature of the threat.