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AUSCERT External Security Bulletin Redistribution
ESB-2022.3837
Cisco Small Business RV Series Routers Vulnerabilities
4 August 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20842 CVE-2022-20841 CVE-2022-20827
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-mult-vuln-CbVp4SUR
Comment: CVSS (Max): 9.8 CVE-2022-20842 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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Cisco Small Business RV Series Routers Vulnerabilities
Priority: Critical
Advisory ID: cisco-sa-sb-mult-vuln-CbVp4SUR
First Published: 2022 August 3 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwb58268 CSCwb58273 CSCwb98961 CSCwb98964 CSCwc00210
CVE Names: CVE-2022-20827 CVE-2022-20841 CVE-2022-20842
CWEs: CWE-120 CWE-77 CWE-78
Summary
o Multiple vulnerabilities in Cisco Small Business RV160, RV260, RV340, and
RV345 Series Routers could allow an unauthenticated, remote attacker to
execute arbitrary code or cause a denial of service (DoS) condition 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-mult-vuln-CbVp4SUR
Affected Products
o Vulnerable Products
CVE-2022-20827 and CVE-2022-20841 affect the following Cisco products:
RV160 VPN Routers
RV160W Wireless-AC VPN Routers
RV260 VPN Routers
RV260P VPN Routers with PoE
RV260W Wireless-AC VPN Routers
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
CVE-2022-20842 affects 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
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
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 dependent on one another. Exploitation of one of
the vulnerabilities may be 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-2022-20842: Cisco Small Business RV Series Routers Remote Code
Execution and Denial of Service Vulnerability
A vulnerability in the web-based management interface of Cisco RV340,
RV340W, RV345, and RV345P Dual WAN Gigabit VPN 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 insufficient validation of user-supplied input
to the web-based management interface. An attacker could exploit this
vulnerability by sending crafted HTTP input 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 released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCwc00210
CVE ID: CVE-2022-20842
Security Impact Rating (SIR): Critical
CVSS Base Score: 9.8
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVE-2022-20827: Cisco Small Business RV Series Routers Web Filter Database
Update Command Injection Vulnerability
A vulnerability in the web filter database update feature of Cisco Small
Business RV160, RV260, RV340, and RV345 Series Routers could allow an
unauthenticated, remote attacker to perform a command injection and execute
commands on the underlying operating system with root privileges.
This vulnerability is due to insufficient input validation. An attacker
could exploit this vulnerability by submitting crafted input to the web
filter database update feature. A successful exploit could allow the
attacker to execute commands on the underlying operating system with root
privileges.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this this vulnerability.
Bug ID(s): CSCwb58268 , CSCwb58273
CVE ID: CVE-2022-20827
Security Impact Rating (SIR): Critical
CVSS Base Score: 9.0
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVE-2022-20841: Cisco Small Business RV Series Routers Open Plug and Play
Command Injection Vulnerability
A vulnerability in the Open Plug and Play (PnP) module of Cisco Small
Business RV160, RV260, RV340, and RV345 Series Routers could allow an
unauthenticated, remote attacker to inject and execute arbitrary commands
on the underlying operating system.
This vulnerability is due to insufficient validation of user-supplied
input. An attacker could exploit this vulnerability by sending malicious
input to an affected device. A successful exploit could allow the attacker
to execute arbitrary commands on the underlying Linux operating system. To
exploit this vulnerability, an attacker must leverage a man-in-the-middle
position or have an established foothold on a specific network device that
is connected to the affected router.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this this vulnerability.
Bug ID(s): CSCwb98961 , CSCwb98964
CVE ID: CVE-2022-20841
Security Impact Rating (SIR): High
CVSS Base Score: 8.3
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/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 with service contracts that entitle
them to regular software updates should obtain security fixes through their
usual update channels.
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.
The Cisco Support and Downloads page on Cisco.com provides information
about licensing and downloads. This page can also display customer device
support coverage for customers who use the My Devices tool.
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 software release
as indicated in the following table(s):
CVE-2022-20827 and CVE-2022-20841
Cisco Product Affected Releases First Fixed Release
RV160 and RV260 Series Routers Earlier than 1.0.01.05 Not vulnerable
RV160 and RV260 Series Routers 1.0.01.05 1.0.01.09
RV340 and RV345 Series Routers Earlier than 1.0.03.26 Not vulnerable
RV340 and RV345 Series Routers 1.0.03.26 1.0.03.28
CVE-2022-20842
Cisco Product Affected Releases First Fixed Release
RV340 and RV345 Series Routers 1.0.03.26 and earlier 1.0.03.28
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco 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 the following people for reporting these
vulnerabilities:
Q. Kaiser of IoT Inspector Research Lab, working with Trend Micro Zero
Day Initiative: CVE-2022-20827
leommxj of Chaitin Security Research Lab: CVE-2022-20841
Peanuts of the CLP-team: CVE-2022-20842
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-mult-vuln-CbVp4SUR
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2022-AUG-03 |
+----------+---------------------------+----------+--------+--------------+
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