Source: cna@vuldb.com
A vulnerability was found in Exciting Printer and classified as critical. This issue affects some unknown processing of the file lib/printer/jobs/prepare_page.rb of the component Argument Handler. The manipulation of the argument URL leads to command injection. The patch is named 5f8c715d6e2cc000f621a6833f0a86a673462136. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-217139.
Critical vulnerability exists in Exciting Printer, allowing for command injection via manipulation of the URL argument within the prepare_page.rb file. Successful exploitation grants an attacker the ability to execute arbitrary commands on the affected system, potentially leading to complete system compromise and data exfiltration.
Step 1: Payload Delivery: The attacker crafts a malicious URL containing a command injection payload. This payload is designed to execute arbitrary commands on the server.
Step 2: Request Submission: The attacker submits the crafted URL to the Exciting Printer application, likely through a web interface or API that interacts with the printer functionality.
Step 3: Vulnerable Code Execution: The prepare_page.rb file processes the URL. Due to the lack of input validation, the attacker-controlled payload within the URL is directly incorporated into a system command.
Step 4: Command Execution: The system executes the malicious command injected by the attacker. This command can perform actions such as creating reverse shells, downloading malware, or exfiltrating data.
Step 5: System Compromise: The attacker gains control of the system, potentially leading to data breaches, denial of service, or further exploitation of the network.
The vulnerability stems from a failure to properly sanitize or validate user-supplied input (the URL) before passing it to a system command within the prepare_page.rb file. Specifically, the code likely constructs a command string using the URL as an argument, without adequate escaping or input validation. This allows an attacker to inject malicious commands into the URL, which are then executed by the system. The root cause is a lack of input validation and command injection prevention mechanisms, such as proper use of parameterized queries or escaping special characters. The patch 5f8c715d6e2cc000f621a6833f0a86a673462136 likely addresses this by implementing input sanitization or using a safer method for executing external commands.
While specific APT groups are not mentioned, any threat actor with the skills to craft and deploy command injection payloads could exploit this vulnerability. The potential for remote code execution makes this a high-priority target. CISA KEV status is likely, given the severity.
Monitor web server logs for suspicious URL patterns, especially those containing command injection payloads (e.g., ;, |, &&, ||, backticks).
Analyze network traffic for unusual outbound connections originating from the Exciting Printer server.
Implement file integrity monitoring to detect unauthorized modifications to the prepare_page.rb file or other related files.
Monitor system process activity for suspicious processes or command executions.
Use a Web Application Firewall (WAF) to detect and block malicious requests containing command injection attempts.
Apply the patch 5f8c715d6e2cc000f621a6833f0a86a673462136 immediately.
Implement robust input validation to sanitize all user-supplied input, especially the URL argument.
Use parameterized queries or prepared statements when constructing commands to prevent command injection.
Employ a Web Application Firewall (WAF) to filter malicious requests.
Regularly update the Exciting Printer software to the latest version.
Implement least privilege principles, restricting the permissions of the user account running the Exciting Printer application.
Conduct regular vulnerability scans and penetration testing to identify and address security weaknesses.