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AUSCERT External Security Bulletin Redistribution
ESB-2021.1046
Cisco IOS and IOS XE Software Common Industrial Protocol
Privilege Escalation Vulnerability
25 March 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS Software Common Industrial Protocol
Cisco IOS XE Software Common Industrial Protocol
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Administrator Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1392
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-XE-SAP-OPLbze68
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco IOS and IOS XE Software Common Industrial Protocol Privilege Escalation
Vulnerability
Priority: High
Advisory ID: cisco-sa-XE-SAP-OPLbze68
First Published: 2021 March 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvu58224
CVE Names: CVE-2021-1392
CWEs: CWE-522
Summary
o A vulnerability in the CLI command permissions of Cisco IOS and Cisco IOS
XE Software could allow an authenticated, local attacker to retrieve the
password for Common Industrial Protocol (CIP) and then remotely configure
the device as an administrative user.
This vulnerability exists because incorrect permissions are associated with
the show cip security CLI command. An attacker could exploit this
vulnerability by issuing the command to retrieve the password for CIP on an
affected device. A successful exploit could allow the attacker to
reconfigure the device.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-XE-SAP-OPLbze68
This advisory is part of the March 2021 release of the Cisco IOS and IOS XE
Software Security Advisory Bundled Publication. For a complete list of the
advisories and links to them, see Cisco Event Response: March 2021
Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled
Publication .
Affected Products
o Vulnerable Products
This vulnerability affects Cisco devices if they are running a vulnerable
release of Cisco IOS or Cisco IOS XE Software and have CIP enabled.
CIP is not enabled by default.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine Whether CIP Is Enabled
To determine whether CIP is enabled on a device, issue the show cip status
command and check the State: value . The following example shows that CIP
is enabled for VLAN 1:
Router> show cip status
State : Enabled
Vlan : 1
If the command returns no output or returns an error message, as shown in
the following example, the device is not affected by this vulnerability:
Router> show cip status
^
% Invalid input detected at '^' marker.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
IOS XR Software
NX-OS Software
Workarounds
o There are no workarounds that address this vulnerability. However,
mitigations are available:
Disabling the CIP feature eliminates the attack vector for this
vulnerability and may be a suitable mitigation until affected devices
can be upgraded. To disable the CIP feature, use the no cip enable
command in the interface configuration mode for the VLAN that CIP is
currently enabled on.
For devices that are configured with TACACS+ authentication,
authorization, and accounting (AAA) command authorization, use this
feature to give non-administrative users access to the commands that
they require and deny access to all other commands.
While these mitigations have been deployed and were proven successful in a
test environment, customers should determine the applicability and
effectiveness in their own environment and under their own use conditions.
Customers should be aware that any workaround or mitigation that is
implemented may negatively impact the functionality or performance of their
network based on intrinsic customer deployment scenarios and limitations.
Customers should not deploy any workarounds or mitigations before first
evaluating the applicability to their own environment and any impact to
such environment.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco IOS and IOS XE Software
To help customers determine their exposure to vulnerabilities in Cisco IOS
and IOS XE Software, Cisco provides the Cisco Software Checker to identify
any Cisco Security Advisories that impact a specific software release and
the earliest release that fixes the vulnerabilities described in each
advisory ("First Fixed"). If applicable, the tool also returns the earliest
release that fixes all the vulnerabilities described in all the advisories
identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories, a specific advisory, or all advisories in
the most recent bundled publication.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE
Software release-for example, 15.1(4)M2 or 3.13.8S.
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker on Cisco.com and check the Medium check box in the
drop-down list under Impact Rating when customizing a search.
For a mapping of Cisco IOS XE Software releases to Cisco IOS Software
releases, refer to the Cisco IOS XE 2 Release Notes , Cisco IOS XE 3S
Release Notes , or Cisco IOS XE 3SG Release Notes , depending on the Cisco
IOS XE Software release.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during internal security testing by X.B. of
the Cisco Advanced Security Initiatives Group (ASIG).
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: March 2021 Semiannual Cisco IOS and IOS XE Software
Security Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-XE-SAP-OPLbze68
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-MAR-24 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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