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AUSCERT External Security Bulletin Redistribution
ESB-2021.2627
Cisco Small Business RV160 and RV260 Series VPN Routers
Remote Command Execution Vulnerability
5 August 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Small Business RV160 and RV260 Series VPN Routers
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1602
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv-code-execution-9UVJr7k4
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Small Business RV160 and RV260 Series VPN Routers Remote Command
Execution Vulnerability
Priority: High
Advisory ID: cisco-sa-rv-code-execution-9UVJr7k4
First Published: 2021 August 4 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvy02232
CVE Names: CVE-2021-1602
CWEs: CWE-78
Summary
o A vulnerability in the web-based management interface of Cisco Small
Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers could allow
an unauthenticated, remote attacker to execute arbitrary commands on the
underlying operating system of an affected device.
This vulnerability is due to insufficient user input validation. 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 using root
-level privileges. Due to the nature of the vulnerability, only commands
without parameters can be executed.
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-rv-code-execution-9UVJr7k4
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco Small Business RV Series
Routers if they are running firmware releases earlier than 1.0.01.04:
RV160 VPN Routers
RV160W Wireless-AC VPN Routers
RV260 VPN Routers
RV260P VPN Router with PoE
RV260W Wireless-AC VPN Routers
Note: 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 this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
RV340 Dual WAN Gigabit VPN Routers
RV340W Dual WAN Gigabit Wireless-AC VPN Routers
RV345 Dual WAN Gigabit VPN Routers
RV345P Dual WAN Gigabit PoE VPN Routers
Workarounds
o There are no workarounds that address this vulnerability.
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.
Fixed Releases
Cisco fixed this vulnerability in firmware releases 1.0.01.04 and later for
the following Cisco products:
RV160 VPN Routers
RV160W Wireless-AC VPN Routers
RV260 VPN Routers
RV260P VPN Router with PoE
RV260W Wireless-AC VPN 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 vulnerability that is
described in this advisory.
Source
o Cisco would like to thank the following researchers for reporting this
vulnerability:
b0ldfrev of DBAPPSecurity
Yu3H0, Ainevsia, and Cascades of Shanghai Jiao Tong University
TIANGONG Team of Legendsec from Qi'anxin Group
Jr-Wei Huang
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-code-execution-9UVJr7k4
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-AUG-04 |
+----------+---------------------------+----------+--------+--------------+
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