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CVE-2024-42835

RCE vulnerability in langflow v1.0.12 via PythonCodeTool component.

  • CVSS 9.8
  • CWE-94
  • Input Validation and Sanitization
  • Remote

langflow v1.0.12 was discovered to contain a remote code execution (RCE) vulnerability via the PythonCodeTool component.

CVE
CVE-2024-42835
CWE
CWE-94
CVSS base score
9.8
Published
2024-10-31
OWASP
A01 Broken Access Control
Orthogonal defect classification
Function
Code defect classification
Incorrect Functionality
Category
Input Validation and Sanitization
Subcategory
Command Injection
Accessibility scope
Remote
Impact
Arbitrary Code Execution
Affected component
PythonCodeTo
Fixed by upgrading
Yes

Solution

Upgrade to langflow v1.0.13 or later.

Vulnerable code sample

class PythonCodeTool:
    def execute_code(self, code):
        """Vulnerable function that demonstrates the security issue."""
        try:
            exec(code)
            except Exception as e:
                print(f"Error executing code: {e}")

                tool = PythonCodeTool()
                tool.execute_code("import os; os.system('ls')")

Patched code sample

class PythonCodeTool:
    BLACKLIST = ['os', 'sys', 'subprocess', 'eval', 'exec', 'open', '__']

    def execute_code(self, code):
        """Secure function that fixes the vulnerability."""
    # SECURE: This version prevents command injection
        for keyword in self.BLACKLIST:
            if keyword in code:
                print(f"Blocked execution of code containing restricted keyword: {keyword}")
                return
                try:
                    exec(code)
                    except Exception as e:
                        print(f"Error executing code: {e}")

                        tool = PythonCodeTool()
                        tool.execute_code("import os; os.system('ls')")

Payload

import os; os.system('whoami')

Cite this entry

@misc{vaitp:cve202442835,
  title        = {{RCE vulnerability in langflow v1.0.12 via PythonCodeTool component.}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2024},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2024-42835},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2024-42835/}}
}
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