Can you explain this vulnerability to me?

CVE-2024-53412 is a command injection vulnerability in the connect() function of the NietThijmen ShoppingCart application version 0.0.2. The vulnerability occurs because the application constructs an SSH command string by directly concatenating user-supplied inputs—specifically the User, Host, and Port fields—without any validation or sanitization.

The Port field is the main injection point. An attacker can add a cart item with a malicious payload in the Port field. When the connect command is executed and the malicious entry is selected, the unsanitized Port value is passed directly to the shell, allowing the attacker to break out of the SSH command context using shell metacharacters like ;, |, or &&.

This enables arbitrary shell command execution on the host system, potentially leading to remote code execution, privilege escalation, and information disclosure.

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How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:

The vulnerability allows remote code execution, privilege escalation, and information disclosure, including exfiltration of system files, environment variables, and credentials. Such impacts can lead to unauthorized access to sensitive personal or protected health information, which may violate compliance requirements under standards like GDPR and HIPAA.

Because the vulnerability enables attackers to execute arbitrary commands and potentially access or exfiltrate sensitive data, affected systems may fail to maintain the confidentiality, integrity, and availability of data as required by these regulations.

Remediation involves strict input validation and avoiding unsafe command construction, which are critical controls to maintain compliance with security best practices mandated by these standards.

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How can this vulnerability impact me? :

This vulnerability allows an attacker to execute arbitrary shell commands on the host system with the privileges of the ShoppingCart application.

• Remote code execution on the host system.
• Privilege escalation, as commands run with the application's privileges.
• Information disclosure, including exfiltration of system files, environment variables, and credentials.
• Potential full system compromise through reverse shell payloads injected into the Port field.

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How can this vulnerability be detected on my network or system? Can you suggest some commands?

This vulnerability can be detected by attempting to inject shell commands into the Port field of the ShoppingCart application and observing if arbitrary commands execute.

A proof of concept involves adding a cart item with a malicious Port value such as `;id` and then triggering the connect command to see if the injected command executes, returning user identity information.

For detection, you can try commands that inject shell metacharacters into the Port field, for example:

• Add a cart item with Port value: `;id`
• Trigger the connect command and select the malicious entry

If the output shows user identity information (e.g., `uid=1000(user) gid=1000(user) groups=1000(user)`), the vulnerability is present.

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What immediate steps should I take to mitigate this vulnerability?

Immediate mitigation steps include enforcing strict validation and sanitization of the Port field and other user inputs before they are used in command execution.

• Validate that the Port field is a numeric integer between 1 and 65535.
• Avoid constructing shell command strings by concatenation; instead, use safe system call libraries such as exec.Command() with discrete arguments to prevent shell interpretation.
• Validate all user-supplied fields (User, Host, Port) against strict allowlists to prevent injection of malicious payloads.

Example safe code snippet for port validation:

```go portInt, err := strconv.Atoi(item.Port) if err != nil || portInt < 1 || portInt > 65535 { return errors.New("invalid port number") } ```

Example safe command execution:

```go cmd := exec.Command("ssh", item.User + "@" + item.Host, "-p", item.Port) ```

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