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AUSCERT External Security Bulletin Redistribution
ESB-2018.1186
Advisory (ICSA-18-107-04) - Rockwell Automation Stratix and
ArmorStratix Switches
18 April 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Rockwell Automation Stratix and ArmorStratix Switches
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0175 CVE-2018-0174 CVE-2018-0173
CVE-2018-0172 CVE-2018-0171 CVE-2018-0167
CVE-2018-0158 CVE-2018-0156
Reference: ESB-2018.1184
ESB-2018.1122
ESB-2018.0900
ESB-2018.0899.4
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
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Advisory (ICSA-18-107-04)
Rockwell Automation Stratix and ArmorStratix Switches
Legal Notice
All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/.
1. EXECUTIVE SUMMARY
CVSS v3 9.8
ATTENTION: Exploitable remotely/low skill level to exploit.
Vendor: Rockwell Automation
Equipment: Allen-Bradley Stratix and ArmorStratix Switches
Vulnerabilities: Improper Input Validation, Resource Management Errors, 7PK
- Errors, Improper Restriction of Operations within the Bounds of a Memory
Buffer, Use of Externally-Controlled Format String.
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could result in loss of
availability, confidentiality, and/or integrity caused by memory exhaustion,
module restart, information corruption, and/or information exposure.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Allen-Bradley Stratix and ArmorStratix Switches use a
vulnerable version of Cisco IOS or IOS XE:
- Allen-Bradley Stratix 5400 Industrial Ethernet Switches, versions
15.2(6)E0a and earlier;
- Allen-Bradley Stratix 5410 Industrial Distribution Switches, versions
15.2(6)E0a and earlier;
- Allen-Bradley Stratix 5700 Industrial Managed Ethernet Switches, versions
15.2(6)E0a and earlier;
- Allen-Bradley Stratix 8000 Modular Managed Ethernet Switches, versions
15.2(6)E0a and earlier;
- Allen-Bradley ArmorStratix 5700 Industrial Managed Ethernet Switches for
extreme environments, versions 15.2(6)E0a and earlier.
Updates for all affected products are now available and linked in the
Mitigation section below.
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco
IOS XE Software could allow an unauthenticated remote attacker to trigger a
reload of an affected device, resulting in a denial of service (DoS) condition,
or to execute arbitrary code on an affected device.
The vulnerability is due to improper validation of packet data. An attacker
could exploit this vulnerability by sending a crafted Smart Install message to
an affected device on TCP port 4786. A successful exploit could allow the
attacker to cause a buffer overflow on the affected device.
CVE-2018-0171 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
3.2.2 IMPROPER INPUT VALIDATION CWE-20
A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco
IOS XE Software could allow an unauthenticated remote attacker to trigger a
reload of an affected device, resulting in a DoS condition.
The vulnerability is due to improper validation of packet data. An attacker
could exploit this vulnerability by sending a crafted packet to an affected
device on TCP port 4786.
CVE-2018-0156 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
3.2.3 IMPROPER INPUT VALIDATION CWE-20
A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS
Software and Cisco IOS XE Software could allow an unauthenticated remote
attacker to cause an affected device to reload, resulting in a DoS condition.
The vulnerability exists because the affected software performs incomplete
input validation of option 82 information that it receives in DHCP Version 4
(DHCPv4) packets from DHCP relay agents. An attacker could exploit this
vulnerability by sending a crafted DHCPv4 packet to an affected device. A
successful exploit could allow the attacker to cause the affected device to
reload, resulting in a DoS condition.
CVE-2018-0174 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
3.2.4 IMPROPER INPUT VALIDATION CWE-20
A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS
Software and Cisco IOS XE Software could allow an unauthenticated remote
attacker to cause an affected device to reload, resulting in a DoS condition.
The vulnerability exists because the affected software performs incomplete
input validation of option 82 information that it receives in DHCP Version 4
(DHCPv4) packets from DHCP relay agents. An attacker could exploit this
vulnerability by sending a crafted DHCPv4 packet to an affected device. A
successful exploit could allow the attacker to cause a heap overflow condition
on the affected device, which will cause the device to reload and result in a
DoS condition.
CVE-2018-0172 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
3.2.5 IMPROPER INPUT VALIDATION CWE-20
A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function
that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4)
packets could allow an unauthenticated remote attacker to cause an affected
device to reload, resulting in a DoS condition.
The vulnerability exists because the affected software performs incomplete
input validation of encapsulated option 82 information that it receives in
DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this
vulnerability by sending a crafted DHCPv4 packet to an affected device, which
the device would then forward to a DHCPv4 server. When the affected software
processes the option 82 information that is encapsulated in the response from
the server, an error could occur. A successful exploit could allow the attacker
to cause the affected device to reload, resulting in a DoS condition.
CVE-2018-0173 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
3.2.6 IMPROPER INPUT VALIDATION CWE-20
A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco
IOS Software and Cisco IOS XE Software could allow an unauthenticated remote
attacker to cause a memory leak or a reload of an affected device that leads to
a DoS condition.
The vulnerability is due to incorrect processing of certain IKEv2 packets. An
attacker could exploit this vulnerability by sending crafted IKEv2 packets to
an affected device to be processed. A successful exploit could cause an
affected device to continuously consume memory and eventually reload, resulting
in a DoS condition.
CVE-2018-0158 has been assigned to this vulnerability. A CVSS v3 base score of
8.6 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
3.2.7 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119
A buffer overflow vulnerability in the LLDP subsystem of Cisco IOS Software,
Cisco IOS XE Software, and Cisco IOS XR Software could allow an adjacent,
unauthenticated attacker to cause a DoS condition or execute arbitrary code
with elevated privileges.
CVE-2018-0167 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is
(AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
3.2.8 USE OF EXTERNALLY-CONTROLLED FORMAT STRING CWE-134
A format string vulnerability in the LLDP subsystem of Cisco IOS Software and
Cisco IOS XE Software could allow an adjacent, unauthenticated attacker to
cause a DoS condition or execute arbitrary code with elevated privileges.
CVE-2018-0175 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is
(AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
3.3 BACKGROUND
- Critical Infrastructure Sectors: Critical Manufacturing, Energy, Water
and Wastewater Systems
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: Wisconsin, USA
3.4 RESEARCHER
Rockwell Automation reported these vulnerabilities to NCCIC from the
semi-annual Cisco IOS and IOS XE Software Security Advisory Bundled
Publication.
4. MITIGATIONS
Rockwell Automation recommends users upgrade to FRN 15.2(6)E1 or later. Updated
software can be downloaded at:
http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?famID=15
Rockwell Automation has provided knowledge base article number 1073268 on their
website at the following location to address these vulnerabilities:
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1073268/ (login
required)
Rockwell Automation also recommends implementing the following mitigations in
addition to upgrading the software version:
Cisco has released new Snort Rules at
https://www.cisco.com/web/software/286271056/117258/sf-rules-2018-03-29-new.html
to help address the following vulnerabilities:
- CVE-2018-0171 - Snort Rule 46096 and 46097
- CVE-2018-0156 - Snort Rule 41725
- CVE-2018-0174 - Snort Rule 46120
- CVE-2018-0172 - Snort Rule 46104
- CVE-2018-0173 - Snort Rule 46119
- CVE-2018-0158 - Snort Rule 46110
Cisco adds the following notes for the Smart Install vulnerabilities
(CVE-2018-0171 and CVE-2018-0156):
- Smart Install is turned off by express setup; however, upgraded switches
but not re-setup may have it enabled.
- Disable the Smart Install feature with the no vstack configuration
command if it is not needed or once setup is complete.
- Users who do use the feature--and need to leave it enabled--can use ACLs to
block incoming traffic on TCP port 4786.
CVE-2018-0167 and CVE-2018-0175 have no specific mitigations in place. See the
following Cisco Vulnerability advisory for more details:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-lldp
Rockwell Automation also recommends users implement the following general
security guidelines:
- Help minimize network exposure for all control system devices and/or
systems, and confirm that they are not accessible from the Internet.
- Locate control system networks and devices behind firewalls, and isolate
them from the business network.
- 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.
NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. 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
in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber
Intrusion Detection and Mitigation Strategies, that is available for download
from the ICS-CERT website.
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for tracking
and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
Contact Information
For any questions related to this report, please contact the NCCIC at:
Email: NCCICCUSTOMERSERVICE@hq.dhs.gov Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information:
http://ics-cert.us-cert.gov or incident reporting:
https://ics-cert.us-cert.gov/Report-Incident?
The NCCIC 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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