Summary

• A vulnerability in the Cisco SD-WAN Solution could allow an authenticated, remote attacker to overwrite arbitrary files on the underlying operating system of an affected device.

  The vulnerability is due to improper input validation of the save command in the CLI of the affected software. An attacker could exploit this vulnerability by modifying the save command in the CLI of an affected device. A successful exploit could allow the attacker to overwrite arbitrary files on the underlying operating system of an affected device and escalate their privileges to the root user.

  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-20190123-sdwan-file-write

Affected Products

• Vulnerable Products

  This vulnerability affects the following Cisco products if they are running a release of the Cisco SD-WAN Solution prior to Release 18.4.0:

  • vBond Orchestrator Software
  • vEdge 100 Series Routers
  • vEdge 1000 Series Routers
  • vEdge 2000 Series Routers
  • vEdge 5000 Series Routers
  • vEdge Cloud Router Platform
  • vManage Network Management Software
  • vSmart Controller Software

  Products Confirmed Not Vulnerable

  Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.

Workarounds

• There are no workarounds that address this vulnerability.

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 and Alerts 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 SD-WAN Solution Release 18.4.0.
  
  Customers can download the Cisco SD-WAN Solution from the Software Center on Cisco.com by clicking Browse all and navigating to the following locations:
  
  vBond, vEdge Cloud, and vSmart

  1. Navigate to Routers > Software-Defined WAN (SD-WAN) > SD-WAN > SD-WAN Software Update.
  2. From the left panel, click 18.4.0 under Latest Release.
  3. Choose vSmart, vEdge Cloud and vBond 18.4.0 upgrade image.

  vEdge 100, 1000, and 2000 Series Routers

  1. Navigate to Routers > Software-Defined WAN (SD-WAN) > vEdge Router > vEdge Router Model.
  2. From the left panel, click 18.4.0 under Latest Release.
  3. Choose vEdge 18.4.0 Upgrade Image for vEdge 100b, vEdge 100m, vEdge 1000, vEdge 2000 Routers.

  vManage Network Management Software

  1. Navigate to Routers > Software-Defined WAN (SD-WAN) > SD-WAN > SD-WAN Software Update.
  2. From the left panel, click 18.4.0 under Latest Release.
  3. Choose vManage 18.4.0 upgrade image.

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

• This vulnerability was found during internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190123-sdwan-file-write

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2019-January-23

  Show Less