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Bug #74220 Special crafted SQL statement trips PDO
Submitted: 2017-03-07 22:34 UTC Modified: -
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: Assigned:
Status: Open Package: PDO PgSQL
PHP Version: 7.1.2 OS: Ubuntu 14.04
Private report: No CVE-ID: None
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 [2017-03-07 22:34 UTC]
I initially reported this at but was told "If you can reproduce this issue with raw PDO, then its not a CakePHP issue."

The provided SQL statement, as executed with PDO, does not insert the provided data correctly.

Prerequisites: create a db role / database table:

postgres=# create role username login password 'password';
postgres=# create database db owner username;
postgres=# \c db
You are now connected to database "db" as user "postgres".
db=# set role username;
db=> create table models(field varchar(12));

The provided SQL statement (see test script) is valid Postgres syntax.

Test script:
$pdo = new PDO('pgsql:host=localhost;dbname=db', 'username', 'password');
$sql = <<<SQL
INSERT INTO models (field) values('\'':1');

$result = $pdo->query('SELECT * FROM models');

Expected result:
array(1) {
  array(2) {
    string(4) "\':1"
    string(4) "\':1"

Actual result:
array(1) {
  array(2) {
    string(4) "\'$1"
    string(4) "\'$1"


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 [2017-03-08 12:14 UTC]
Not sure if I missed something obvious. For now I found multiple ways to
make it work:

1. use prepared statements (i.e. use :name or ? placeholder, etc.)
2. set the PDO flag PDO::ATTR_EMULATE_PREPARES to true
3. apply pgsql C-Style escape syntax [1], i.e. VALUES(E'\\'':1)

About 2): this worked for simple cases but failed in a large
application, didn't yet investigate why

About 3): haven't dug deeper whether this can cause more troubles or not

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Last updated: Mon Feb 18 14:01:25 2019 UTC