WordPress Booking Calendar 7.0 / 7.1 SQL Injection / Local File Inclusion

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  • WordPress Booking Calendar plugin versions 7.1, 7.0, and below suffer from remote SQL injection and local file inclusion vulnerabilities.
    MD5 | fd4e207ff9fc3d6be29efbcdeb30fa9e

    DefenseCode ThunderScan SAST Advisory: WordPress Booking Calendar  
    Multiple Security Vulnerabilities  
    Advisory ID:    DC-2017-12-005  
    Advisory Title: WordPress Booking Calendar Plugin Multiple Vulnerabilities  
    Advisory URL:   http://www.defensecode.com/advisories.php  
    Software:       WordPress Booking Calendar plugin  
    Language:       PHP  
    Version:        7.0/7.1 and below  
    Vendor Status:  Vendor contacted, updates released  
    Release Date:   2017/12/13  
    Risk:           Medium  
    1. General Overview  
    During the security audit of Booking Calendar plugin for WordPress  
    CMS, multiple vulnerabilities were discovered using DefenseCode  
    ThunderScan application source code security analysis platform.  
    More information about ThunderScan is available at URL:  
    2. Software Overview  
    Booking Calendar plugin - described by the authors as the ultimate  
    booking system for online reservation and availability checking  
    service for your site.  
    According to wordpress.org, it has more than 40,000 active installs.  
    3. Vulnerability Description  
    During the security analysis, ThunderScan discovered SQL injection and  
    Local file inclusion vulnerabilities in Booking Calendar WordPress  
    The easiest way to reproduce the SQL injection vulnerabilities is to  
    send the specified parameter to the provided URL while being logged in  
    as administrator or another user that is authorized to access the  
    plugin settings page. Users that do not have full administrative  
    privileges could abuse the database access the vulnerabilities provide  
    to either escalate their privileges or obtain and modify database  
    contents they were not supposed to be able to.  
    By requesting a specially crafted URL, the attacker can cause remote  
    server to execute a php file of his choosing. Although the user  
    requesting the URL has to be logged into the WordPress administrative  
    console, the attacker can cause the administrator to request such a  
    URL by using various social engineering/phishing approaches. Specified  
    file will be interpreted by php interpreter, and any valid php code  
    will indeed be executed. If the php installation on server has  
    "allow_url_include=1" configuration option set, this attack can be  
    expanded to execute a php file from any remote URL. If the php version  
    is less than 5.3.4, the ".php" that gets appended to the end of the  
    file name attacker chose can be omitted by adding a null character  
    ("%00") to the requested URL, and enable the attacker to execute any  
    file, regardless of the extension.  
    Due to the CSRF token needed to perform the attack the risk is lowered  
    to medium.  
    3.1. SQL injection  
    Function: $wpdb->query()  
    Variable: $_POST[ "booking_id" ];  
    Vulnerable URL: /wp-admin/admin-ajax.php  
    File: booking\lib\wpbc-ajax.php  
    152    $booking_id         = $_POST[ "booking_id" ];  
    153    $approved_id        = explode('|',$booking_id);  
    162    $approved_id_str = join( ',', $approved_id);  
    165    if ( false === $wpdb

    query( $wpdb

    prepare( "UPDATE {$wpdb->prefix}bookingdates SET approved = %s WHERE booking_id IN ({$approved_id_str})", $is_approve_or_pending ) ) ){ --------- 3.2. SQL injection Function: $wpdb->query() Variable: $_POST[ "booking_id" ]; Vulnerable URL: /wp-admin/admin-ajax.php Vulnerable code snippets: File: booking\lib\wpbc-ajax.php --------- 110 $id_of_new_bookings = $_POST[ "booking_id" ]; 111 $arrayof_bookings_id = explode('|',$id_of_new_bookings); ... 114 wpbc_update_number_new_bookings( $arrayof_bookings_id, $is_new , $user_id ); --------- File: booking\lib\wpdev-booking-functions.php --------- 1468 function wpbc_update_number_new_bookings( $id_of_new_bookings, $is_new = '0' , $user_id = 1 ){ ... 1485 $update_sql = "UPDATE {$wpdb->prefix}booking AS bk SET bk.is_new = {$is_new} WHERE bk.booking_id IN ( {$id_of_new_bookings} ) "; ... 1487 if ( false === $wpdb->query( $update_sql ) ) { --------- 3.3 PHP file inclusion Function: include() Variable: $_POST['captcha_chalange'] Vulnerable URL: /wp-admin/admin-ajax.php Vulnerable code snippets: File: booking\core\lib\wpbc-booking-new.php --------- 127 if (! wpbc_check_CAPTCHA( $_POST['captcha_user_input'], $_POST['captcha_chalange'], $bktype ) ) { ... 19 function wpbc_check_CAPTCHA( $the_answer_from_respondent, $prefix, $bktype ) { ... 23 $correct = $captcha_instance->check($prefix, $the_answer_from_respondent); --------- File: wp-content\plugins\booking\js\captcha\captcha.php --------- 139 function check( $prefix, $response ) { ... 141 include( $this->tmp_dir . $prefix . '.php' ); --------- 4. Solution =========== Vendor resolved the security issues. All users are strongly advised to update WordPress Booking Calendar plugin to the latest available version. 5. Credits ========== Discovered by Neven Biruski using DefenseCode ThunderScan source code security analyzer. 6. Disclosure Timeline ====================== 2016/11/15 Vulnerabilities discovered 2017/04/04 Vendor contacted 2017/04/04 Vendor responded - 7.0 already fixed SQL injection vulns 2017/04/04 Update released for LFI (7.1) 2017/12/13 Advisory released to the public 7. About DefenseCode ==================== DefenseCode L.L.C. delivers products and services designed to analyze and test web, desktop and mobile applications for security vulnerabilities. DefenseCode ThunderScan is a SAST (Static Application Security Testing, WhiteBox Testing) solution for performing extensive security audits of application source code. ThunderScan SAST performs fast and accurate analyses of large and complex source code projects delivering precise results and low false positive rate. DefenseCode WebScanner is a DAST (Dynamic Application Security Testing, BlackBox Testing) solution for comprehensive security audits of active web applications. WebScanner will test a website's security by carrying out a large number of attacks using the most advanced techniques, just as a real attacker would. Subscribe for free software trial on our website http://www.defensecode.com/ . E-mail: defensecode[at]defensecode.com Website: http://www.defensecode.com Twitter: https://twitter.com/DefenseCode/

    Source: packetstormsecurity.com

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