chore(sqlite): create regression test for RUSTSEC-2024-0363

Cargo.toml

@@ -264,6 +264,11 @@ name = "sqlite-migrate"
 path = "tests/sqlite/migrate.rs"
 required-features = ["sqlite", "macros", "migrate"]
 
+[[test]]
+name = "sqlite-rustsec"
+path = "tests/sqlite/rustsec.rs"
+required-features = ["sqlite"]
+
 [[bench]]
 name = "sqlite-describe"
 path = "benches/sqlite/describe.rs"

tests/sqlite/rustsec.rs

@@ -0,0 +1,78 @@
+use sqlx::{Connection, Error, SqliteConnection};
+
+// https://rustsec.org/advisories/RUSTSEC-2024-0363.html
+//
+// Similar theory to the Postgres exploit in `tests/postgres/rustsec.rs` but much simpler
+// since we just want to overflow the query length itself.
+#[sqlx::test]
+async fn rustsec_2024_0363() -> anyhow::Result<()> {
+    let overflow_len = 4 * 1024 * 1024 * 1024; // 4 GiB
+
+    // `real_query_prefix` plus `fake_message` will be the first query that SQLite "sees"
+    //
+    // Rather contrived because this already represents a regular SQL injection,
+    // but this is the easiest way to demonstrate the exploit for SQLite.
+    let real_query_prefix = "INSERT INTO injection_target(message) VALUES ('";
+    let fake_message = "fake_msg') RETURNING id;";
+    let real_query_suffix = "') RETURNING id";
+
+    // Our actual payload is another query
+    let real_payload =
+        "\nUPDATE injection_target SET message = 'you''ve been pwned!' WHERE id = 1;\n--";
+
+    // This will parse the query up to `real_payload`.
+    let fake_payload_len = real_query_prefix.len() + fake_message.len();
+
+    // Pretty easy to see that this will overflow to `fake_payload_len`
+    let target_len = overflow_len + fake_payload_len;
+
+    let inject_len = target_len - real_query_prefix.len() - real_query_suffix.len();
+
+    let pad_len = inject_len - fake_message.len() - real_payload.len();
+
+    let mut injected_value = String::with_capacity(inject_len);
+    injected_value.push_str(fake_message);
+    injected_value.push_str(real_payload);
+
+    let padding = " ".repeat(pad_len);
+    injected_value.push_str(&padding);
+
+    let query = format!("{real_query_prefix}{injected_value}{real_query_suffix}");
+
+    assert_eq!(query.len(), target_len);
+
+    let mut conn = SqliteConnection::connect("sqlite://:memory:").await?;
+
+    sqlx::raw_sql(
+        "CREATE TABLE injection_target(id INTEGER PRIMARY KEY, message TEXT);\n\
+            INSERT INTO injection_target(message) VALUES ('existing message');",
+    )
+    .execute(&mut conn)
+    .await?;
+
+    let res = sqlx::raw_sql(&query).execute(&mut conn).await;
+
+    if let Err(e) = res {
+        // Connection rejected the query; we're happy.
+        if matches!(e, Error::Protocol(_)) {
+            return Ok(());
+        }
+
+        panic!("unexpected error: {e:?}");
+    }
+
+    let messages: Vec<String> =
+        sqlx::query_scalar("SELECT message FROM injection_target ORDER BY id")
+            .fetch_all(&mut conn)
+            .await?;
+
+    // If the injection succeeds, `messages` will look like:
+    // ["you've been pwned!'.to_string(), "fake_msg".to_string()]
+    assert_eq!(
+        messages,
+        ["existing message".to_string(), "fake_msg".to_string()]
+    );
+
+    // Injection didn't affect our database; we're happy.
+    Ok(())
+}