Cisco Security Advisory
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X
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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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-rv-bypass-inject-Rbhgvfdx
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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 Router CVE-2021-1472 and 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.
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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:LCVE-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
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There are no workarounds that address these vulnerabilities.
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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.htmlAdditionally, 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.
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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.
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Cisco would like to thank T. Shiomitsu of IoT Inspector Research Lab for reporting these vulnerabilities.
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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.
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Show LessVersion Description Section Status Date 1.0 Initial public release. — Final 2021-APR-07
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