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AUSCERT External Security Bulletin Redistribution
ESB-2021.3668
Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities
4 November 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Catalyst Passive Optical Network (PON) Series Switches
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Remote/Unauthenticated
Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-40113 CVE-2021-40112 CVE-2021-34795
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-catpon-multivulns-CE3DSYGr
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Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities
Priority: Critical
Advisory ID: cisco-sa-catpon-multivulns-CE3DSYGr
First Published: 2021 November 3 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvz61943 CSCvz61948 CSCvz67097
CVE Names: CVE-2021-34795 CVE-2021-40112 CVE-2021-40113
CWEs: CWE-284 CWE-288 CWE-798
Summary
o Multiple vulnerabilities in the web-based management interface of the Cisco
Catalyst Passive Optical Network (PON) Series Switches Optical Network
Terminal (ONT) could allow an unauthenticated, remote attacker to perform
the following actions:
Log in with a default credential if the Telnet protocol is enabled
Perform command injection
Modify the configuration
For more information about these vulnerabilities, see the Details section
of this advisory.
Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-catpon-multivulns-CE3DSYGr
Affected Products
o Vulnerable Products
These vulnerabilities affect the following Cisco products:
Catalyst PON Switch CGP-ONT-1P
Catalyst PON Switch CGP-ONT-4P
Catalyst PON Switch CGP-ONT-4PV
Catalyst PON Switch CGP-ONT-4PVC
Catalyst PON Switch CGP-ONT-4TVCW
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Note: By default, the Cisco Catalyst PON Series Switches ONTs allow only
local LAN connections to the web management interface. Therefore, all these
vulnerabilities are exploitable only via the switches' LAN ports unless
Remote Web Management has been configured.
Devices must be running a vulnerable release and have the Telnet protocol
enabled to be affected by the Cisco Catalyst PON Series Switches Optical
Network Terminal Telnet Default Credential Vulnerability (CVE-2021-34795).
Note: The Telnet protocol is disabled by default and the default credential
works only over Telnet.
Determine the Remote Web Management Configuration
To determine whether the Remote Web Management feature is enabled, navigate
to Administration > Device Access Settings and look at the Remote Web
Management tab. If the Enable check box is checked, Remote Web Management
is enabled on the device.
Determine the Telnet Configuration
To determine whether Telnet access is enabled on the device, navigate to
Administration > Device Access Settings and look at the Local Telnet tab.
If the Enable check box is checked, Telnet access is enabled on the device.
Additional Information
For additional information, see Cisco Catalyst PON Series Switches ONT
Configuration Guide - Manage Access .
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by these vulnerabilities.
Cisco has confirmed that these vulnerabilities do not affect the following
Cisco products:
Catalyst PON Switch CGP-OLT-8T
Catalyst PON Switch CGP-OLT-16T
Details
o The vulnerabilities are not dependent on one another. Exploitation of one
of the vulnerabilities is not required to exploit another vulnerability. In
addition, a software release that is affected by one of the vulnerabilities
may not be affected by the other vulnerabilities.
Details about the vulnerabilities are as follows:
CVE-2021-34795: Cisco Catalyst PON Series Switches Optical Network Terminal
Telnet Default Credential Vulnerability
A vulnerability in the Telnet service of Cisco Catalyst PON Series Switches
ONT could allow an unauthenticated, remote attacker to log in to the
affected device by using a debugging account that has a default, static
password.
This vulnerability is due to an unintentional debugging credential that
exists on the device. An attacker could exploit this vulnerability by
establishing a Telnet session to the device and logging in with the default
credential. A successful exploit could allow the attacker to take complete
control of the device. The device must be configured to allow Telnet
connections. Telnet is not enabled by default.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvz67097
CVE ID: CVE-2021-34795
Security Impact Rating (SIR): Critical
CVSS Base Score: 10.0
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVE-2021-40113: Cisco Catalyst PON Series Switches Optical Network Terminal
Unauthenticated Command Injection Vulnerability
A vulnerability in the web-based management interface of the Cisco Catalyst
PON Series Switches ONT could allow an unauthenticated, remote attacker to
perform a command injection attack against an affected device.
This vulnerability is due to insufficient validation of user-supplied
input. An attacker could exploit this vulnerability by sending a crafted
request to the web-based management interface. A successful exploit could
allow the attacker to execute arbitrary commands on an affected device as
the root user.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvz61948
CVE ID: CVE-2021-40113
Security Impact Rating (SIR): Critical
CVSS Base Score: 10.0
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
CVE-2021-40112: Cisco Catalyst PON Series Switches Optical Network Terminal
Unauthenticated Configuration Modification Vulnerability
A vulnerability in the web management interface of the Cisco Catalyst PON
Series Switches ONT could allow an unauthenticated, remote attacker to
modify the configuration of the device.
This vulnerability is due to improper HTTPS input validation. An attacker
could exploit this vulnerability by sending a crafted HTTPS request to the
web management interface. A successful exploit could allow the attacker to
modify the configuration.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvz61943
CVE ID: CVE-2021-40112
Security Impact Rating (SIR): High
CVSS Base Score: 8.6
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
Workarounds
o There are no workarounds that address these vulnerabilities.
Fixed Software
o Cisco has released free software updates that address the vulnerabilities
described in this advisory. Customers with service contracts that entitle
them to regular software updates should obtain security fixes through their
usual update channels.
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.
The Cisco Support and Downloads page on Cisco.com provides information
about licensing and downloads. This page can also display customer device
support coverage for customers who use the My Devices tool.
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.
Fixed Releases
In the following table(s), the left column lists Cisco software releases.
The right column indicates whether a release is affected by the
vulnerabilities described in this advisory and the first release that
includes the fix for these vulnerabilities. Customers are advised to
upgrade to an appropriate fixed software release as indicated in this
section.
Catalyst PON Switch CGP-ONT-1P
Cisco Catalyst PON Series Switches First Fixed Release for These
ONT Vulnerabilities
1.1 1.1.1.14
Catalyst PON Switches CGP-ONT-4P, CGP-ONT-4PV, CGP-ONT-4PVC, and
CGP-ONT-4TVCW
Cisco Catalyst PON Series Switches First Fixed Release for These
ONT Vulnerabilities
1.1 1.1.3.17
To download the software from the Software Center on Cisco.com, do the
following:
1. Click Browse all .
2. Choose Switches > Campus LAN Switches - Access > Catalyst PON Series .
3. Choose a specific product from the right pane of the product selector.
4. Choose a hardware platform from the left pane of the product's software
page.
5. Download the software.
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco PSIRT is not aware of any public announcements or malicious use
of the vulnerabilities that are described in this advisory.
Source
o Cisco would like to thank Marco Wiorek of Hotzone GmbH for reporting these
vulnerabilities.
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-catpon-multivulns-CE3DSYGr
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-NOV-03 |
+----------+---------------------------+----------+--------+--------------+
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