#34654: Post-normalization performed on the Username field leading to the
bypass of
the whitespace stripping
------------------------------+------------------------------------
Reporter: Sim4n6 | Owner: nobody
Type: Bug | Status: new
Component: contrib.auth | Version: dev
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
------------------------------+------------------------------------
Comment (by Sim4n6):
The `contains_unwanted_characters()` would fail more often than you
expect.
{{{
import unicodedata
def contains_unwanted_characters(username):
"""Check if the username contains characters that normalize to
whitespace."""
normalized_username = unicodedata.normalize("NFKC", username)
return username != normalized_username.strip()
usernames = ["sim4n6", " ̈sim4n6 ̈", "℻", "Ｓim4n6","Siｍ4n6"]
for username in usernames:
print(contains_unwanted_characters(username))
}}}
Between I still believe there is a security concern here. Anyway, I have a
security background and this issue is classified as non-related. So, that
would be my last comment regarding this issue.
Regards,
--
Ticket URL: <https://code.djangoproject.com/ticket/34654#comment:10>
Django <https://code.djangoproject.com/>
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