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gh-96250: Improve sqlite3 injection attack example (GH-99270) 

(cherry picked from commit 41d4ac9da3)

Co-authored-by: Jia Junjie <62194633+jiajunjie@users.noreply.github.com>
Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>
Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>
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Miss Islington (bot) 2022-12-08 12:45:40 -08:00 committed by GitHub
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Doc/library/sqlite3.rst
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@ -1813,12 +1813,16 @@ How to use placeholders to bind values in SQL queries
SQL operations usually need to use values from Python variables. However,
beware of using Python's string operations to assemble queries, as they
are vulnerable to `SQL injection attacks`_ (see the `xkcd webcomic
<https://xkcd.com/327/>`_ for a humorous example of what can go wrong)::
are vulnerable to `SQL injection attacks`_. For example, an attacker can simply
close the single quote and inject ``OR TRUE`` to select all rows::
# Never do this -- insecure!
symbol = 'RHAT'
cur.execute("SELECT * FROM stocks WHERE symbol = '%s'" % symbol)
>>> # Never do this -- insecure!
>>> symbol = input()
' OR TRUE; --
>>> sql = "SELECT * FROM stocks WHERE symbol = '%s'" % symbol
>>> print(sql)
SELECT * FROM stocks WHERE symbol = '' OR TRUE; --'
>>> cur.execute(sql)
Instead, use the DB-API's parameter substitution. To insert a variable into a
query string, use a placeholder in the string, and substitute the actual values