[issue25723] ConfigParser should never write broken configurations

[SpaceOne]

SpaceOne added the comment:

Isn't is an actual problem in the field? We had a vulnerability in our code due to this as we only sanitized the config values and didn't recognized that add_section() does no validation of input.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25723>
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