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Improper handling of checking for unusual or exceptional conditions
File: flask.py | Checkov ID: CKV3_SAST_4
Description
CWE: CWE-754: Improper Check for Unusual or Exceptional Conditions
The assert statement in Python is used for debugging purposes. It lets you test if a certain condition is met, and if not, the program will raise an AssertionError exception.
The main problem with assert is that it can be globally disabled with the -O (optimize) option in Python, or by setting the environment variable PYTHONOPTIMIZE to a non-empty string. This means that when Python code is run in optimized mode, all assert statements are ignored.
Therefore, if you're using assert to check for conditions that should prevent the program from continuing (for example, validating user input or checking configuration files), those checks will be skipped in optimized mode, which could lead to incorrect program behavior or even security vulnerabilities.
Here is an example of problematic code:
def process_data(data):
assert data is not None, "Data must not be None"
# Continue with processing...In this code, if Python is run with optimization enabled, the assert statement will be ignored, and the process_data function will proceed even if data is None, which could cause errors later on.
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