An external control of file name or path vulnerability has been reported to affect HBS 3 Hybrid Backup Sync. If an attacker gains local network access, they can then exploit the vulnerability to read or modify files or directories. We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 26.2.0.938 and later
HBS 3 Hybrid Backup Sync is vulnerable to a critical file path manipulation flaw, allowing attackers with local network access to read, modify, or delete critical files and directories. This vulnerability could lead to data breaches, system compromise, and denial-of-service conditions.
Step 1: Network Access: The attacker gains access to the local network where the vulnerable HBS 3 Hybrid Backup Sync instance is running. This could be achieved through various means, such as compromised credentials, social engineering, or exploiting other vulnerabilities on the network.
Step 2: Authentication (If Required): The attacker authenticates to the HBS 3 application, potentially using compromised credentials or exploiting another vulnerability to bypass authentication. The level of authentication required will depend on the specific implementation and configuration.
Step 3: Payload Injection: The attacker crafts a malicious file path or filename containing path traversal sequences (e.g., ../../../etc/passwd) or other malicious payloads. This payload is then submitted to the HBS 3 application through a vulnerable function, such as a backup or restore operation.
Step 4: Path Manipulation: The HBS 3 application processes the attacker-supplied input without proper validation or sanitization. The malicious file path is then used in file system operations.
Step 5: File Access/Modification: The application, using the attacker-controlled path, reads, modifies, or deletes files or directories on the system. This could include sensitive configuration files, backup data, or even system files, depending on the privileges of the HBS 3 process.
The vulnerability stems from insufficient input validation and sanitization of user-controlled file path parameters within the HBS 3 application. Specifically, the application fails to properly validate the file names or paths provided by an authenticated user, allowing an attacker to inject malicious path traversal sequences (e.g., ../..) or crafted filenames. This leads to the application accessing or manipulating files outside of its intended scope. The root cause is likely a missing or inadequate check on user-supplied input before it's used in file system operations. The lack of proper input validation allows the attacker to control the file path, leading to arbitrary file access. This could involve reading sensitive configuration files, overwriting critical system files, or deleting backup data. The absence of proper authorization checks further exacerbates the issue.