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AUSCERT External Security Bulletin Redistribution
ESB-2021.3458
ICS Advisory (ICSA-21-287-07)
18 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens Scalance Device
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Modify Arbitrary Files -- Existing Account
Cross-site Request Forgery -- Remote with User Interaction
Denial of Service -- Remote/Unauthenticated
Delete Arbitrary Files -- Existing Account
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-37733 CVE-2021-37731 CVE-2021-37729
CVE-2021-37728 CVE-2021-37725 CVE-2021-37724
CVE-2021-37723 CVE-2021-37722 CVE-2021-37721
CVE-2021-37720 CVE-2021-37718 CVE-2021-37717
CVE-2021-37716 CVE-2020-37719 CVE-2019-5318
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-287-07
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ICS Advisory (ICSA-21-287-07)
Siemens SCALANCE
Original release date: October 14, 2021
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Siemens
o Equipment: SCALANCE
o Vulnerabilities: Cross-site Request Forgery, OS Command Injection, Classic
Buffer Overflow, Command Injection, Path Traversal, Missing Encryption of
Sensitive Data
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
inject commands or trigger buffer overflows.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of SCALANCE W1750D, a software management platform, are
affected:
o SCALANCE W1750D: All versions prior to v8.7.1.3
o SCALANCE W1750D: Version 8.7.1.3 or later (Only affected by CVE-2019-5318,
CVE-2020-37719, CVE-2021-37717, CVE-2021-37718, CVE-2021-37720,
CVE-2021-37721, CVE-2021-37722, CVE-2021-37728)
3.2 VULNERABILITY OVERVIEW
3.2.1 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
The web interface for RAPConsole lacks Anti-CSRF protections in place for
state-changing operations. This can be exploited by an attacker to reboot the
affected device if the attacker can convince a user to visit a specially
crafted webpage.
CVE-2019-5318 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/C:N/
I:N/A:H ).
3.2.2 OS COMMAND INJECTION CWE-78
An authenticated command injection vulnerability exists in the ArubaOS command
line interface. Successful exploitation of this vulnerability results in the
ability to execute arbitrary commands as a privileged user on the underlying
operating system. This allows an attacker to fully compromise the underlying
operating system on the device running ArubaOS.
CVE-2020-37719 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).
3.2.3 CLASSIC BUFFER OVERFLOW CWE-120
There are multiple buffer overflow vulnerabilities that could lead to
unauthenticated remote code execution by sending specially crafted packets
destined to the PAPI (Aruba Networks AP management protocol) UDP Port (8211) of
devices running ArubaOS. This may allow for denial-of-service attacks and/or
remote code execution in the underlying operating system.
CVE-2021-37716 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:H/A:H ).
3.2.4 COMMAND INJECTION CWE-77
An authenticated command injection vulnerability exists in the ArubaOS
web-based management user interface. Successful exploitation of this
vulnerability results in the ability to execute arbitrary commands as a
privileged user on the underlying operating system. This allows an attacker to
fully compromise the underlying operating system on the device running ArubaOS.
CVE-2021-37717 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).
3.2.5 COMMAND INJECTION CWE-77
An authenticated command injection vulnerability exists in the ArubaOS
web-based management user interface. Successful exploitation of this
vulnerability results in the ability to execute arbitrary commands as a
privileged user on the underlying operating system. This allows an attacker to
fully compromise the underlying operating system on the device running ArubaOS.
CVE-2021-37718 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).
3.2.6 COMMAND INJECTION CWE-77
An authenticated command injection vulnerability exists in the ArubaOS command
line interface. Successful exploitation of this vulnerability results in the
ability to execute arbitrary commands as a privileged user on the underlying
operating system. This allows an attacker to fully compromise the underlying
operating system on the device running ArubaOS.
CVE-2021-37720 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).
3.2.7 COMMAND INJECTION CWE-77
An authenticated command injection vulnerability exists in the ArubaOS command
line interface. Successful exploitation of this vulnerability results in the
ability to execute arbitrary commands as a privileged user on the underlying
operating system. This allows an attacker to fully compromise the underlying
operating system on the device running ArubaOS.
CVE-2021-37721 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).
3.2.8 COMMAND INJECTION CWE-77
An authenticated command injection vulnerability exists in the ArubaOS command
line interface. Successful exploitation of this vulnerability results in the
ability to execute arbitrary commands as a privileged user on the underlying
operating system. This allows an attacker to fully compromise the underlying
operating system on the device running ArubaOS.
CVE-2021-37722 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).
3.2.9 COMMAND INJECTION CWE-77
An authenticated command injection vulnerability exists in the ArubaOS command
line interface. This vulnerability is only present in instances of the Mobility
Conductor. Successful exploitation of this vulnerability results in the ability
to execute arbitrary commands as a privileged user on the underlying operating
system. This allows an attacker to fully compromise the underlying operating
system on the Mobility Conductor running ArubaOS.
CVE-2021-37723 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).
3.2.10 COMMAND INJECTION CWE-77
An authenticated command injection vulnerability exists in the ArubaOS command
line interface. This vulnerability is only present in instances of the Mobility
Conductor. Successful exploitation of this vulnerability results in the ability
to execute arbitrary commands as a privileged user on the underlying operating
system. This allows an attacker to fully compromise the underlying operating
system on the Mobility Conductor running ArubaOS.
CVE-2021-37724 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).
3.2.11 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
A vulnerability in the web-based management interface of ArubaOS could allow an
unauthenticated remote attacker to conduct a Cross-Site Request Forgery (CSRF)
attack against a vulnerable system. Successful exploitation of this
vulnerability would consist of an attacker persuading an authorized user to
follow a malicious link, resulting in the deletion of arbitrary files with the
privilege level of the targeted user.
CVE-2021-37725 has been assigned to this vulnerability. A CVSS v3 base score of
7.1 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/C:L/
I:H/A:N ).
3.2.12 PATH TRAVERSAL CWE-22
An authenticated path traversal vulnerability exists in the ArubaOS command
line interface. Successful exploitation of this vulnerability results in the
ability to impact the integrity of critical files on the underlying operating
system. This allows an attacker to impact the availability of the ArubaOS
instance and may allow for modification of sensitive data.
CVE-2021-37728 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:N/
I:H/A:H ).
3.2.13 PATH TRAVERSAL CWE-22
An authenticated path traversal vulnerability exists in the ArubaOS web-based
management interface. Successful exploitation of this vulnerability results in
the ability to impact the integrity of critical files on the underlying
operating system. This allows an attacker to impact the availability of the
ArubaOS instance and may allow for modification of sensitive data.
CVE-2021-37729 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:N/
I:H/A:H ).
3.2.14 MISSING ENCRYPTION OF SENSITIVE DATA CWE-311
An authenticated local path traversal vulnerability exists in the ArubaOS
web-based management interface and CLI. This vulnerability only affects
physical hardware controllers such as the 9000 series and 7x00 series.
Successful exploitation of this vulnerability requires physical access to the
controller and results in the ability to impact the integrity and
confidentiality of critical files on the underlying operating system. This
allows an attacker to impact the availability of the ArubaOS instance and may
allow for modification or disclosure of sensitive data.
CVE-2021-37731 has been assigned to this vulnerability. A CVSS v3 base score of
6.1 has been assigned; the CVSS vector string is ( AV:P/AC:H/PR:H/UI:N/S:U/C:H/
I:H/A:H/E:P/RL:O/RC:C ).
3.2.15 PATH TRAVERSAL CWE-22
An authenticated path traversal vulnerability exists in the ArubaOS command
line interface. Successful exploitation of this vulnerability results in the
ability to read arbitrary files on the underlying operating system, including
sensitive system files.
CVE-2021-37733 has been assigned to this vulnerability. A CVSS v3 base score of
4.9 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:N/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Energy, Food and Agriculture,
Healthcare and Public Health, Transportation Systems, and Water and Wastewater
Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported these vulnerabilities to CISA.
4. MITIGATIONS
Siemens recommends upgrading SCALANCE W1750 to Versions 8.7.1.3 or later
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce the risk:
o Block access to the ArubaOS Command Line Interface from all untrusted
users.
o Block access to the ArubaOS web-based management interface from all
untrusted users.
o Block access to the Mobility Conductor Command Line Interface from all
untrusted users.
o Enabling the Enhanced PAPI Security feature where available will prevent
exploitation of these vulnerabilities. Please contact TAC for assistance if
needed.
o Exploitation requires physical access. Controllers in strictly controlled
physical environments are at low risk.
o To minimize the likelihood of an attacker exploiting these vulnerabilities,
Aruba recommends the communication between Controller/Gateways and
Access-Points be restricted either by having a dedicated Layer 2 segment/
VLAN or, if Controller/Gateways and Access-Points cross Layer 3 boundaries,
to have firewall policies restricting the communication of these authorized
devices. In addition, enabling the Enhanced PAPI Security feature will
prevent the PAPI-specific vulnerabilities above from being exploited.
Contact Aruba Support for configuration assistance.
o The RAPConsole or Local Debug (LD) homepage can be reached by users in a
split or bridge role. This can be prevented by configuring an ACL to
restrict access to the LD homepage, which effectively prevents this issue.
Detailed instructions for ACL implementation are available.
As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. In order to operate the devices
in a protected IT environment, Siemens recommends to configure the environment
according to Siemens' operational guidelines for industrial security , and to
follow the recommendations in the product manuals.
For additional information, please refer to Siemens Security Advisory
SSA-280624
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.cisa.gov . Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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