Funambol Zefiro Cloud Arbitrary File Overwrite Vulnerability Allowing Code Execution

A vulnerability in Funambol Zefiro Cloud version 32.0.2026011614 allows attackers to overwrite critical internal files through the file import process. This arbitrary file overwrite can lead to execution of malicious code or exposure of sensitive information. The vulnerability arises from inadequate security checks when handling imported files, enabling a malicious app to manipulate filenames and contents to overwrite important files in the app's internal storage. Such modifications can disrupt the app's functionality, cause it to crash, or trigger the execution of unauthorized code.

Impact

Exploitation of this vulnerability could result in unauthorized code execution, modification of critical application files, and potential privilege escalation.

Reproduction

The vulnerability can be reproduced by using a malicious application that exploits the file import feature of the Zefiro Cloud app. The malicious app must be able to control the filename and content of the imported file, using path traversal techniques to overwrite sensitive files in the app's internal storage. Once the file is imported, the overwritten files can lead to arbitrary code execution or cause the app to malfunction.