Overview
CVE-2025-63406 is a critical security vulnerability affecting Intermesh BV GroupOffice. This flaw allows a remote attacker to execute arbitrary code on the server. The vulnerability resides in the FunctionField.php file and is triggered via the dbToApi() and eval() functions. It affects versions prior to v.25.0.47 and 6.8.136. Immediate patching is strongly recommended.
Technical Details
The vulnerability stems from insufficient input validation and sanitization within the dbToApi() function located in FunctionField.php. This function, in conjunction with the use of eval(), allows an attacker to inject and execute arbitrary PHP code. By crafting a malicious request, an attacker can pass unsanitized data that is then processed by eval(), leading to complete system compromise. The exact attack vector involves manipulating input to the dbToApi() function in a way that injects malicious PHP code. The eval() function then executes this code, effectively granting the attacker control of the server.
CVSS Analysis
Currently, no CVSS score has been assigned to CVE-2025-63406. However, given that this is a Remote Code Execution (RCE) vulnerability, it is likely to receive a CVSS score of Critical (9.0-10.0) upon evaluation. RCE vulnerabilities are among the most severe security flaws as they allow an attacker to completely compromise a system without requiring local access.
Possible Impact
The potential impact of CVE-2025-63406 is significant. Successful exploitation can lead to:
- Complete System Compromise: An attacker gains full control of the GroupOffice server.
- Data Breach: Sensitive data stored within GroupOffice can be accessed, modified, or deleted.
- Service Disruption: The GroupOffice service can be disrupted, leading to downtime and loss of productivity.
- Malware Distribution: The compromised server can be used to distribute malware to other users or systems.
- Lateral Movement: An attacker can use the compromised server as a stepping stone to access other systems on the network.
Mitigation or Patch Steps
The primary mitigation step is to immediately upgrade GroupOffice to the latest version (v.25.0.47 or 6.8.136 or later) where this vulnerability is patched. Follow these steps:
- Backup Your Data: Before applying any updates, create a complete backup of your GroupOffice data.
- Upgrade GroupOffice: Upgrade your GroupOffice installation to version v.25.0.47 or 6.8.136 or later. Refer to the official GroupOffice documentation for detailed upgrade instructions.
- Verify the Installation: After the upgrade, verify that the vulnerability is no longer present.
- Monitor System Logs: Continuously monitor system logs for any suspicious activity.
If immediate patching is not possible, consider implementing temporary workarounds, although these are not substitutes for patching:
- Input Sanitization: Implement strict input validation and sanitization on data passed to the
dbToApi()function. This can help prevent the injection of malicious code. - Disable Functionality (If Possible): If the
FunctionFieldfunctionality is not essential, consider temporarily disabling it.
Important: Workarounds provide only partial protection and should only be used as a temporary measure until a patch can be applied.
