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AUSCERT External Security Bulletin Redistribution
ESB-2021.1172
Cisco Small Business RV Series Routers Vulnerabilities
8 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: 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
Create Arbitrary Files -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1473 CVE-2021-1472
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-rv-bypass-inject-Rbhgvfdx
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Cisco Small Business RV Series Routers Vulnerabilities
Priority: High
Advisory ID: cisco-sa-sb-rv-bypass-inject-Rbhgvfdx
First Published: 2021 April 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvw92538 CSCvw92718 CSCvw92723
CVE Names: CVE-2021-1472 CVE-2021-1473
CWEs: CWE-119 CWE-284
Summary
o Multiple vulnerabilities exist in the web-based management interface of
Cisco Small Business RV Series Routers. A remote attacker could execute
arbitrary commands or bypass authentication and upload files on an affected
device.
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-sb-rv-bypass-inject-Rbhgvfdx
Affected Products
o Vulnerable Products
These vulnerabilities affect the following Cisco products if they are
running a vulnerable software release. For information about which Cisco
software releases are vulnerable, see the Fixed Software section of this
advisory.
Cisco Small Business RV Series Routers Associated CVE ID(s)
RV160 VPN Router CVE-2021-1472
RV160W Wireless-AC VPN Router CVE-2021-1472
RV260 VPN Router CVE-2021-1472
RV260P VPN Router with PoE CVE-2021-1472
RV260W Wireless-AC VPN Router CVE-2021-1472
RV340 Dual WAN Gigabit VPN Router CVE-2021-1472 and
CVE-2021-1473
RV340W Dual WAN Gigabit Wireless-AC VPN CVE-2021-1472 and
Router CVE-2021-1473
RV345 Dual WAN Gigabit VPN Router CVE-2021-1472 and
CVE-2021-1473
RV345P Dual WAN Gigabit PoE VPN Router CVE-2021-1472 and
CVE-2021-1473
For more information, see the Details section of this advisory.
Determine the Device Configuration
The web-based management interface for these devices is available through
local LAN connections by default and cannot be disabled there. The
interface can also be made available through the WAN interface by enabling
the remote management feature. By default, the remote management feature is
disabled on affected devices.
To determine whether the remote management feature is enabled for a device,
open the web-based management interface through a local LAN connection and
choose Basic Settings > Remote Management . If the Enable check box is
checked, remote management is enabled for the device.
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 The vulnerabilities are not dependent on one another. Exploitation of one
of the vulnerabilities is not required to exploit the other vulnerability.
In addition, a software release that is affected by one of the
vulnerabilities may not be affected by the other vulnerability.
Details about the vulnerabilities are as follows:
CVE-2021-1473: Cisco Small Business RV340 Series Routers Command Injection
Vulnerability
A vulnerability in the web-based management interface of Cisco Small
Business RV340 Series Routers could allow an unauthenticated, remote
attacker to execute arbitrary commands on an affected device.
This vulnerability is due to insufficient user input validation. An
attacker could exploit this vulnerability by sending malicious requests to
an affected device. A successful exploit could allow the attacker to run
arbitrary commands on the underlying OS.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This vulnerability affects the following Cisco products:
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
Bug ID(s): CSCvw92538
CVE ID: CVE-2021-1473
Security Impact Rating (SIR): High
CVSS Base Score: 7.3
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVE-2021-1472: Cisco Small Business RV Series Routers Authentication Bypass
File Upload Vulnerability
A vulnerability in the web-based management interface of Cisco Small
Business RV Series Routers could allow an unauthenticated, remote attacker
to bypass authentication and upload files to directories that should
require administrative authentication.
This vulnerability is due to improper session management on affected
devices. An attacker could exploit this vulnerability by sending a crafted
HTTP request to the affected device. A successful exploit could allow the
attacker to upload files to directories that should have been restricted.
It should be noted that the files are uploaded to temporary directories,
and the files should be deleted.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This vulnerability affects the following Cisco products:
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
Bug ID(s): CSCvw92718 and CSCvw92723
CVE ID: CVE-2021-1472
Security Impact Rating (SIR): Medium
CVSS Base Score: 5.3
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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
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 software from the Software Center on Cisco.com, click
Browse All and navigate to Downloads Home > Routers > Small Business
Routers > Small Business RV Series Routers .
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 T. Shiomitsu of IoT Inspector Research Lab 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-sb-rv-bypass-inject-Rbhgvfdx
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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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
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Previous advisories and external security bulletins can be retrieved from:
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===========================================================================
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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