CVE-2023-39631: Arbitrary Code Execution in numexpr

Background

numexpr is a Python package available on PyPI that provides fast numerical expression evaluation. It is commonly used in scientific computing and data analysis applications. The vulnerability in version 0.0.245 of the LanChain-ai Langchain software allows a remote attacker to execute arbitrary code through the evaluate function in the numexpr library.

Vulnerability Detail

The vulnerability arises due to insufficient input validation in the evaluate function of the numexpr library. By crafting a malicious input, an attacker can exploit this vulnerability to execute arbitrary code on the target system. This can lead to various consequences, including unauthorized access, data theft, or system compromise. The vulnerability has a CVSSv3 score of 9.8, indicating its critical severity.

pip install --upgrade "numexpr==2.8.5"

Workaround

As a temporary workaround, users can disable or restrict the usage of the evaluate function in the numexpr library. This can be achieved by modifying the code that invokes the evaluate function or by implementing input validation checks to ensure only trusted inputs are processed. Here is an example of how to disable the evaluate function:

import numexpr

def evaluate(expression):
    raise NotImplementedError('evaluate function is disabled due to security vulnerability')

# Rest of the code

Conclusion

In conclusion, the vulnerability in the numexpr library used by LanChain-ai Langchain allows remote code execution, posing a significant security risk. It is crucial to update the numexpr package to a patched version or apply the provided workaround to mitigate the vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for numexpr →

FAQ