Summary

• A vulnerability in the Secure Sockets Layer (SSL) VPN feature of Cisco Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device or cause the device to reload, resulting in a denial of service (DoS) condition.

  The vulnerability exists because HTTP requests are not properly validated. An attacker could exploit this vulnerability by sending a crafted HTTP request over an SSL connection to an affected device. A successful exploit could allow the attacker to remotely execute arbitrary code on the device 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.

  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-rce-dos-9ZAjkx4

Affected Products

• Vulnerable Products

  This vulnerability affects the following Cisco Small Business Routers if they are running a firmware release earlier than Release 1.0.03.18 and have the SSL VPN configured:

  • 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

  Determine the SSL VPN Configuration

  To determine whether the SSL VPN is configured, administrators can use the web-based utility and choose VPN > SSL VPN. If the radio button is clicked to On, the device is vulnerable.

  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 Small Business Routers:

  • RV160 VPN Router
  • RV160W Wireless-AC VPN Router
  • RV260 VPN Router
  • RV260P VPN Router with POE
  • RV260W Wireless-AC VPN Router

Workarounds

• There are no workarounds that address this vulnerability. However, disabling the SSL VPN eliminates the attack vector for this vulnerable and maybe a suitable mitigation until the affected device can be upgraded. To disable the SSL VPN, administrators can use the web-based utility, choose VPN > SSL VPN, and set the radio button to Off.

Fixed Software

• 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 Cisco RV340, RV340W, RV345, and RV345P Routers firmware releases 1.0.03.18 and later.

  To download the software from the Software Center on Cisco.com, do the following:

  1. Click Browse all.
  2. Choose Routers > Small Business Routers > Small Business RV Series Routers.
  3. Choose the appropriate router.
  4. Choose Small Business Router Firmware.
  5. Choose a release from the left pane of the product page.

Exploitation and Public Announcements

• 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

• Cisco would like to thank 0x00string of exploitee.rs for reporting this vulnerability.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-rce-dos-9ZAjkx4

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2020-JUL-15

  Show Less