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

(cherry picked from commit 41d4ac9da348ca33056e271d71588b2dc3a6d48d)

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>

diff --git a/Doc/library/sqlite3.rst b/Doc/library/sqlite3.rst
index 9775f80624a0feb05310366633c6cdd7f8406345..65fa1b613153d73bceeafceb549ccfacecfb5db2 100644 (file)
--- a/Doc/library/sqlite3.rst
+++ b/Doc/library/sqlite3.rst
@@ -1427,12 +1427,16 @@ 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)::
-
-   # Never do this -- insecure!
-   symbol = 'RHAT'
-   cur.execute("SELECT * FROM stocks WHERE symbol = '%s'" % symbol)
+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 = 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