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AUSCERT External Security Bulletin Redistribution
ESB-2021.1171
Cisco Small Business RV Series Routers Link Layer Discovery
Protocol Vulnerabilities
8 April 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: RV132W ADSL2+ Wireless-N VPN Router
RV134W VDSL2 Wireless-AC VPN Router
RV160 VPN Router
RV160W Wireless-AC VPN Router
RV260 VPN Router
RV260P VPN Router with PoE
RV260W Wireless-AC VPN Router
RV340 Dual WAN Gigabit VPN Router
RV340W Dual WAN Gigabit Wireless-AC VPN Router
RV345 Dual WAN Gigabit VPN Router
RV345P Dual WAN Gigabit PoE VPN Router
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1309 CVE-2021-1308 CVE-2021-1251
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv-multi-lldp-u7e4chCe
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Cisco Small Business RV Series Routers Link Layer Discovery Protocol
Vulnerabilities
Priority: High
Advisory ID: cisco-sa-rv-multi-lldp-u7e4chCe
First Published: 2021 April 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvw62392 CSCvw62395 CSCvw62410 CSCvw62411 CSCvw62413
CSCvw62416 CSCvw62417 CSCvw62418 CSCvw94339 CSCvw94341
CSCvw95016 CSCvw95017
CVE Names: CVE-2021-1251 CVE-2021-1308 CVE-2021-1309
CWEs: CWE-119 CWE-130 CWE-400
Summary
o Multiple vulnerabilities exist in the Link Layer Discovery Protocol (LLDP)
implementation for Cisco Small Business RV Series Routers. An
unauthenticated, adjacent attacker could execute arbitrary code or cause an
affected router to leak system memory or reload. A memory leak or device
reload would cause a denial of service (DoS) condition on an affected
device.
For more information about these vulnerabilities, see the Details section
of this advisory.
Note: LLDP is a Layer 2 protocol. To exploit these vulnerabilities, an
attacker must be in the same broadcast domain as the affected device (Layer
2 adjacent).
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-rv-multi-lldp-u7e4chCe
Affected Products
o Vulnerable Products
These vulnerabilities affect the following Cisco Small Business RV Series
Routers if they are running a vulnerable firmware release and have LLDP
enabled:
RV132W ADSL2+ Wireless-N VPN Router
RV134W VDSL2 Wireless-AC VPN Router
RV160 VPN Router
RV160W Wireless-AC VPN Router
RV260 VPN Router
RV260P VPN Router with PoE
RV260W Wireless-AC VPN Router
RV340 Dual WAN Gigabit VPN Router
RV340W Dual WAN Gigabit Wireless-AC VPN Router
RV345 Dual WAN Gigabit VPN Router
RV345P Dual WAN Gigabit PoE VPN Router
For information about which Cisco firmware releases are vulnerable, see the
Fixed Software section of this advisory.
LLDP Configurations
For Cisco RV132W and RV134W Routers, LLDP is enabled by default on all LAN
ports and WAN interfaces.
For the following Cisco Small Business Routers, LLDP is enabled by default
on the LAN ports and disabled by default on the WAN interfaces:
RV160 VPN Router
RV160W Wireless-AC VPN Router
RV260 VPN Router
RV260P VPN Router with PoE
RV260W Wireless-AC VPN Router
RV340 Dual WAN Gigabit VPN Router
RV340W Dual WAN Gigabit Wireless-AC VPN Router
RV345 Dual WAN Gigabit VPN Router
RV345P Dual WAN Gigabit PoE VPN Router
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by these vulnerabilities.
Details
o These 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-2021-1309: Cisco Small Business RV Series Routers Link Layer Discovery
Protocol Remote Code Execution and Denial of Service Vulnerability
A vulnerability in the LLDP implementation for Cisco Small Business RV
Series Routers could allow an unauthenticated, adjacent attacker to execute
arbitrary code on an affected device or cause the device to reload.
This vulnerability is due to missing length validation of certain LLDP
packet header fields. An attacker could exploit this vulnerability by
sending a malicious LLDP packet to the targeted router. A successful
exploit could allow the attacker to execute code on the affected router or
cause it to reload unexpectedly, resulting in a DoS condition.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvw62392 , CSCvw62410 , CSCvw62413 and CSCvw62416
CVE ID: CVE-2021-1309
Security Impact Rating (SIR): High
CVSS Base Score: 8.8
CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVE-2021-1251: Cisco Small Business RV Series Routers Link Layer Discovery
Protocol Memory Leak Denial of Service Vulnerability
A vulnerability in the LLDP implementation for Cisco Small Business RV
Series Routers could allow an unauthenticated, adjacent attacker to cause a
memory leak on an affected device.
This vulnerability is due to missing length validation of certain LLDP
packet header fields. An attacker could exploit this vulnerability by
sending a malicious LLDP packet to the targeted router. A successful
exploit could cause continuous memory consumption on an affected device and
eventually cause it to reload, resulting in a DoS condition.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvw94339 , CSCvw94341 , CSCvw95016 and CSCvw95017
CVE ID: CVE-2021-1251
Security Impact Rating (SIR): High
CVSS Base Score: 7.4
CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVE-2021-1308: Cisco Small Business RV Series Routers Link Layer Discovery
Protocol Denial of Service Vulnerability
A vulnerability in the LLDP implementation for Cisco Small Business RV
Series Routers could allow an unauthenticated, adjacent attacker to cause
an affected router to reload unexpectedly.
This vulnerability is due to missing length validation of certain LLDP
packet header fields. An attacker could exploit this vulnerability by
sending a malicious LLDP packet to the targeted router. A successful
exploit could allow the attacker to cause the affected router to reload
unexpectedly, resulting in a DoS condition.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvw62395 , CSCvw62411 , CSCvw62417 and CSCvw62418
CVE ID: CVE-2021-1308
Security Impact Rating (SIR): High
CVSS Base Score: 7.4
CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/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 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.
Fixed Releases
Customers are advised to upgrade to an appropriate fixed firmware release
as indicated in the following table(s):
Cisco Small Business RV Series Routers Fixed Releases
RV132W 1.0.1.15 and later
RV134W 1.0.1.21 and later
RV160, RV160W, RV260, RV260P, and RV260W 1.0.01.03 and later
RV340, RV340W, RV345, and RV345P 1.0.03.21 and later
To download the firmware from the Software Center on Cisco.com, do the
following:
1. Click Browse all .
2. Choose Routers > Small Business Routers > Small Business RV Series
Routers .
3. Choose the appropriate router.
4. Choose Small Business Router Firmware .
5. Choose a release from the left pane of the product page.
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 vulnerabilities that are
described in this advisory.
Source
o Cisco would like to thank Qian Chen of Qihoo 360 Nirvan Team 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-rv-multi-lldp-u7e4chCe
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-APR-07 |
+----------+---------------------------+----------+--------+--------------+
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You have received this e-mail bulletin as a result of your organisation's
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maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
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and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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