Date: Thu, 11 Jan 2018 15:51:00 +0200
From: Maor Shwartz <maors@...ondsecurity.com>
To: fulldisclosure@...lists.org
Cc: SecuriTeam Secure Disclosure <ssd@...ondsecurity.com>
Subject: [FD] SSD Advisory – Seagate Personal Cloud Multiple Vulnerabilities

SSD Advisory – Seagate Personal Cloud Multiple Vulnerabilities

Full report: https://blogs.securiteam.com/index.php/archives/3548
Twitter: @SecuriTeam_SSD
Weibo: SecuriTeam_SSD

Vulnerabilities summary
The following advisory describes two (2) unauthenticated command injection
vulnerabilities.

Seagate Personal Cloud Home Media Storage is “the easiest way to store,
organize, stream and share all your music, movies, photos, and important
documents.”

Credit
An independent security researcher, Yorick Koster, has reported this
vulnerability to Beyond Security’s SecuriTeam Secure Disclosure program

Vendor response
Seagate was informed of the vulnerability on October 16, but while
acknowledging the receipt of the vulnerability information, refused to
respond to the technical claims, to give a fix timeline or coordinate an
advisory

Vulnerabilities details
Seagate Media Server uses Django web framework and is mapped to the .psp
extension.

Any URL that ends with .psp is automatically send to the Seagate Media
Server application using the FastCGI protocol.
/etc/lighttpd/conf.d/django-host.conf:

===

fastcgi.server += (

".psp"=>

   ((

      "socket" => "/var/run/manage_py-fastcgi.socket",

      "check-local" => "disable",

      "stream-post" => "enable",

      "allow-x-send-file" => "enable",

   )),

".psp/"=>

   ((

      "socket" => "/var/run/manage_py-fastcgi.socket",

      "check-local" => "disable",

      "stream-post" => "enable",

      "allow-x-send-file" => "enable",

   ))

)

===

URLs are mapped to specific views in the file
/usr/lib/django_host/seagate_media_server/urls.py.

Two views were found to be affected by unauthenticated command injection.

The affected views are:

uploadTelemetry
getLogs

These views takes user input from GET parameters and pass these
unvalidated/unsanitized to methods of the commands Python module.

This allows an attacker to inject arbitrary system commands, that will be
executed with root privileges.

/usr/lib/django_host/seagate_media_server/views.py:

===

@csrf_exempt

def uploadTelemetry(request):

   ts = request.GET.get('TimeStamp','')

   if (checkDBSQLite()) :

      response = '{"stat":"failed","code":"80","message":"The Database has
not been initialized or mounted yet!"}'

   else :

      if ts == "":

         response = '{"stat":"failed","code":"380","message":"TimeStamp
parameter missing"}'

         return HttpResponse(response);

      cmd = "/usr/local/bin/log_telemetry "+str(ts)

      commands.getoutput(cmd)

   return HttpResponse('{"stat":"ok"}')

===

/usr/lib/django_host/seagate_media_server/views.py:

===

@csrf_exempt

def getLogs (request):

   try:

      cmd_base='/usr/bin/log-extract-manager.sh'

      uID = request.GET.get ( 'arch_id', None )

      time_stamp = request.GET.get ( 'time_stamp', '' )



      if uID:

         (status, output) = commands.getstatusoutput(cmd_base + ' status '
+ uID);

         if ('In progress' in output) and (uID in output) :

            return HttpResponse ('{"stat":"ok", "data": {"status":"In
Progress"}}')

         elif (status == 0) :

            return HttpResponse ('{"stat":"ok", "data": {"url":"%s",
"fileSize":"%d"}}' % ( urllib.quote(output.encode('utf-8')),
os.path.getsize(output) ))

         else :

            return HttpResponse ('{"stat":"failed",
"code":"853","message":"Id not recognized."}' )

      else:

         (status, output) = commands.getstatusoutput(cmd_base + ' start ' +
time_stamp);

         if (status == 0) :

            return HttpResponse ('{"stat":"ok", "data":
{"archiveID":"%s"}}' % (output))



      return HttpResponse ('{"stat":"failed", "code":"852","message":"Zip
file not created."}' )

   except :

      return HttpResponse ('{"stat":"failed", "code":"852","message":"Zip
file not created."}' )

===

Note that both views contain the csrf_exempt decorator, which disables the
default Cross-Site Request Forgery protection of Django. As such, these
issues can be exploited via Cross-Site Request Forgery.



--
Thanks
Maor Shwartz
Beyond Security
GPG Key ID: 6D273779F52A9FC2

Download attachment "SSD Advisory – Seagate Personal Cloud Multiple Vulnerabilities.pdf" of type "application/pdf" (156207 bytes)


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