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AUSCERT External Security Bulletin Redistribution
ESB-2021.2808
Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers Remote
Command Execution and Denial of Service Vulnerability
19 August 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Small Business RV series routers
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2021-34730
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cisco-sb-rv-overflow-htpymMB5
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Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers Remote Command
Execution and Denial of Service Vulnerability
Priority: Critical
Advisory ID: cisco-sa-cisco-sb-rv-overflow-htpymMB5
First Published: 2021 August 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvz05607
CVE Names: CVE-2021-34730
CWEs: CWE-121
Summary
o A vulnerability in the Universal Plug-and-Play (UPnP) service of Cisco
Small Business RV110W, RV130, RV130W, and RV215W Routers could allow an
unauthenticated, remote attacker to execute arbitrary code or cause an
affected device to restart unexpectedly, resulting in a denial of service
(DoS) condition.
This vulnerability is due to improper validation of incoming UPnP traffic.
An attacker could exploit this vulnerability by sending a crafted UPnP
request to an affected device. A successful exploit could allow the
attacker to execute arbitrary code as the root user on the underlying
operating system or cause the device to reload, resulting in a DoS
condition.
Cisco has not 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-cisco-sb-rv-overflow-htpymMB5
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco Small Business RV Series
Routers if they have UPnP configured:
RV110W Wireless-N VPN Firewalls
RV130 VPN Routers
RV130W Wireless-N Multifunction VPN Routers
RV215W Wireless-N VPN Routers
Note: The UPnP service is enabled by default on LAN interfaces and disabled
by default on WAN interfaces. If UPnP is disabled on both the LAN and WAN
interfaces, the device is not considered vulnerable.
Determine the UPnP Configuration
To determine whether the UPnP feature is enabled on the LAN interface of a
device, open the web-based management interface and navigate to Basic
Settings > UPnP . If the Disable check box is unchecked, UPnP is enabled on
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.
Workarounds
o There are no workarounds that address this vulnerability. However,
administrators may disable the affected feature.
To disable UPnP on the LAN interface of a device, do the following:
1. Open the web-based management interface and choose Basic Settings >
UPnP .
2. Check the Disable check box.
While this mitigation has been deployed and was proven successful in a test
environment, customers should determine the applicability and effectiveness
in their own environment and under their own use conditions. Customers
should be aware that any workaround or mitigation that is implemented may
negatively impact the functionality or performance of their network based
on intrinsic customer deployment scenarios and limitations. Customers
should not deploy any workarounds or mitigations before first evaluating
the applicability to their own environment and any impact to such
environment.
Fixed Software
o Cisco has not released and will not release software updates to address the
vulnerability described in this advisory. The Cisco Small Business RV110W,
RV130, RV130W, and RV215W Routers have entered the end-of-life process.
Customers are advised to refer to the end-of-life notices for these
products:
End-of-Sale and End-of-Life Announcement for the Cisco Small Business RV
Series Routers (selected models)
Customers are encouraged to migrate to the Cisco Small Business RV132W,
RV160, or RV160W Routers.
When considering a device migration, 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 new devices will be sufficient
for their network needs; the new devices contain sufficient memory, and
current hardware and software configurations will continue to be supported
properly by the new product. If the information is not clear, customers are
advised to contact the Cisco Technical Assistance Center (TAC) or their
contracted maintenance providers.
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 Quentin Kaiser of IoT Inspector Research Lab for
reporting this vulnerability.
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-cisco-sb-rv-overflow-htpymMB5
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-AUG-18 |
+----------+---------------------------+----------+--------+--------------+
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