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             AUSCERT External Security Bulletin Redistribution

                              ESB-2020.3030.2
        Cisco Small Business RV340 Series Routers Command Injection
                 and Remote Code Execution Vulnerabilities
                             17 September 2020

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           RV340W Dual WAN Gigabit Wireless-AC VPN Router
                   RV340 Dual WAN Gigabit 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
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-3453 CVE-2020-3451 

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv-osinj-rce-pwTkPCJv

Revision History:  September 17 2020: Updated information and Security Impact Rating.
                   September  3 2020: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Small Business RV340 Series Routers Command Injection and Remote Code
Execution Vulnerabilities

Priority:        High

Advisory ID:     cisco-sa-rv-osinj-rce-pwTkPCJv

First Published: 2020 September 2 16:00 GMT

Last Updated:    2020 September 16 15:40 GMT

Version 2.0:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:   CSCvu40103CSCvu49391

CVE-2020-3451    
CVE-2020-3453    

CWE-119
CWE-20

Summary

  o Multiple vulnerabilities in the web-based management interface of Cisco
    Small Business RV340 Series Routers could allow an authenticated, remote
    attacker with administrative credentials to execute arbitrary commands on
    the underlying operating system (OS) as a restricted user.

    For more information about these vulnerabilities, see the Details section
    of this advisory.

    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-rv-osinj-rce-pwTkPCJv

Affected Products

  o Vulnerable Products

    These vulnerabilities affect the following Cisco Small Business Routers if
    they are running Firmware Release 1.0.03.19 or earlier:

       RV340W Dual WAN Gigabit Wireless-AC VPN Router
       RV340 Dual WAN Gigabit VPN Router
       RV345 Dual WAN Gigabit VPN Router
       RV345P Dual WAN Gigabit POE VPN Router

    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.

    Cisco has confirmed that these vulnerabilities do not affect the following
    Cisco products:

       RV160 VPN Router
       RV160W Wireless-AC VPN Router
       RV260 VPN Router

Details

  o The vulnerabilities are not dependent on one another. Exploitation of one
    vulnerability is not required to exploit the other vulnerability.

    Details about the vulnerabilities are as follows.

    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.

    The 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.

    There are no workarounds that address this vulnerability.

    CVE-ID: CVE-2020-3451
    Bug ID(s): CSCvu40103
    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

    Cisco Small Business RV340 Series Routers Remote Code Execution
    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 code on an affected device.

    The vulnerability is due to insufficient boundary restrictions on
    user-supplied input to scripts in the web-based management interface. An
    attacker could exploit this vulnerability by sending crafted requests that
    contain overly large values to an affected device, causing a buffer
    overflow. A successful exploit could allow the attacker to temporarily
    degrade the performance of the interface process or execute arbitrary code
    on the underlying OS.

    There are no workarounds that address this vulnerability.

    CVE-ID: CVE-2020-3453
    Bug ID(s): CSCvu49391
    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

Workarounds

  o There are no workarounds that address these vulnerabilities.

Fixed Software

  o 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.

    Fixed Releases

    See the Details section in the bug ID(s) at the top of this advisory for
    the most complete and current information.

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 0x00string, working with Trend Micro Zero Day
    Initiative (ZDI), 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-rv-osinj-rce-pwTkPCJv

Revision History

  o +---------+--------------------------+-------------+--------+-------------+
    | Version |       Description        |   Section   | Status |    Date     |
    +---------+--------------------------+-------------+--------+-------------+
    |         | Updated details about    | Summary,    |        |             |
    |         | the vulnerabilities,     | Details,    |        |             |
    | 2.0     | updated information      | Vulnerable  | Final  | 2020-SEP-16 |
    |         | regarding the fixed      | Products,   |        |             |
    |         | releases, increased the  | Fixed       |        |             |
    |         | Security Impact Rating.  | Software    |        |             |
    +---------+--------------------------+-------------+--------+-------------+
    | 1.0     | Initial public release.  | -           | Final  | 2020-SEP-02 |
    +---------+--------------------------+-------------+--------+-------------+

- --------------------------END INCLUDED TEXT--------------------

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