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CommScope Ruckus IoT Controller 1.7.1.0 Undocumented Account

CommScope Ruckus IoT Controller 1.7.1.0 Undocumented Account
Posted May 27, 2021
Authored by Jim Becher | Site korelogic.com

An upgrade account is included in the IoT Controller OVA that provides the vendor undocumented access via Secure Copy (SCP).

tags | exploit
advisories | CVE-2021-33216
SHA-256 | f6519f57eed331c93ca5644c3a83e240cb6fe2ee50133663e8ee3dad642af551

CommScope Ruckus IoT Controller 1.7.1.0 Undocumented Account

Change Mirror Download
KL-001-2021-007: CommScope Ruckus IoT Controller Undocumented Account

Title: CommScope Ruckus IoT Controller Undocumented Account
Advisory ID: KL-001-2021-007
Publication Date: 2021.05.26
Publication URL: https://korelogic.com/Resources/Advisories/KL-001-2021-007.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-798: Use of Hard-coded Credentials, CWE-912: Hidden Functionality
CVE ID: CVE-2021-33216


2. Vulnerability Description

An upgrade account is included in the IoT Controller OVA that
provides the vendor undocumented access via Secure Copy (SCP).


3. Technical Description

Once the OVA is imported into VirtualBox, a VMDK file is
created. The VMDK file can be mounted and the directory
structure and its contents can be perused.

An authorized_keys file exists that allows an
individual/organization possessing the SSH private key to
access the virtual appliance using the 'vriotiotupgrade'
account. The 'vriotiotupgrade' account is restricted to scp,
per the rssh configuration.

Additionally, it appears that the IoT Controller has rssh version 2.3.4
installed and in use. At the time of this advisory, there are at least
three remote command injection vulnerabilities in this particular version
of rssh: CVE-2019-3463, CVE-2019-3464 and CVE-2019-1000018.


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-2021-33216.
2021.05.25 - CommScope releases firmware 1.8.0.0 and associated
advisory.
2021.05.26 - KoreLogic public disclosure.


7. Proof of Concept

With the VMDK file mounted at the current working directory:
$ find . -name authorized_keys
./VRIOT/ap-images/authorized_keys
./VRIOT/ops/ap-images/authorized_keys

$ cat VRIOT/ap-images/authorized_keys
ssh-rsa
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
chandini.venkatesh@commscope.com

$ cat VRIOT/ops/ap-images/authorized_keys
ssh-rsa
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
chandini.venkatesh@commscope.com

$ grep "ap-images" etc/passwd
vriotiotupgrade:x:1002:1002::/VRIOT/ap-images/:/usr/bin/rssh

$ tail -8 etc/ssh/sshd_config
Match User vriotiotupgrade
PasswordAuthentication no
AuthorizedKeysFile /VRIOT/ap-images/authorized_keys

Match User vriotha
PasswordAuthentication yes

$ grep -v ^# etc/rssh.conf
logfacility = LOG_USER
allowscp
umask = 022



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/

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

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