CVE-2021-1509: Cisco Security Advisory: Cisco SD-WAN vEdge Software Buffer Overflow Vulnerabilities

• The vulnerabilities are not dependent on one another. Exploitation of one of the vulnerabilities is not 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-2021-1509: Cisco SD-WAN vEdge Software Buffer Overflow Vulnerability

  A vulnerability in the vDaemon process in Cisco SD-WAN vEdge Software could allow an authenticated, remote attacker to cause a buffer overflow on an affected device.

  This vulnerability is due to insufficient bounds checking when an affected device processes traffic. An attacker could exploit this vulnerability by sending malicious traffic to an affected device. The attacker must have a man-in-the-middle position between Cisco vManage and an associated device that is running an affected version of Cisco SD-WAN vEdge Software. A successful exploit could allow the attacker to conduct a controllable buffer overflow attack and possibly execute arbitrary commands as the root user, 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): CSCvt11545
  CVE ID: CVE-2021-1509
  Security Impact Rating (SIR): High
  CVSS Base Score: 7.5
  CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

  CVE-2021-1510: Cisco SD-WAN vEdge Software Buffer Overflow Vulnerability

  A vulnerability in the packet mirroring feature of Cisco SD-WAN vEdge Software could allow an unauthenticated, remote attacker to cause an affected device to reboot, resulting in a DoS condition.

  This vulnerability is due to insufficient bounds checking when an affected device processes traffic. An attacker could exploit this vulnerability by sending malicious traffic through an affected device. A successful exploit could allow the attacker to cause the affected 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): CSCvu28442
  CVE ID: CVE-2021-1510
  Security Impact Rating (SIR): High
  CVSS Base Score: 7.5
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  CVE-2021-1511: Cisco SD-WAN vEdge Software Buffer Overflow Vulnerability

  A vulnerability in forwarding error correction of Cisco SD-WAN vEdge Software could allow an authenticated, remote attacker to cause a DoS condition on an affected device. To exploit this vulnerability, an attacker must be authenticated to the device through IPsec.

  This vulnerability is due to insufficient bounds checking when an affected device processes traffic. An attacker could exploit this vulnerability by sending malicious traffic through an affected device. A successful exploit could allow the attacker to cause the affected 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): CSCvu28407
  CVE ID: CVE-2021-1511
  Security Impact Rating (SIR): Medium
  CVSS Base Score: 6.5
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

• 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

  Customers are advised to upgrade to an appropriate fixed software release as indicated in the following table(s). To ensure a complete upgrade solution, consider that this advisory is part of a collection that includes the following advisories:

  • cisco-sa-sd-wan-vmanage-4TbynnhZ: Cisco SD-WAN vManage Software Vulnerabilities
  • cisco-sa-sdw-auth-bypass-65aYqcS2: Cisco SD-WAN vManage Software Authentication Bypass Vulnerability
  • cisco-sa-sdwan-dos-Ckn5cVqW: Cisco SD-WAN Software vDaemon Denial of Service Vulnerability
  • cisco-sa-sdwan-buffover-MWGucjtO: Cisco SD-WAN vEdge Software Buffer Overflow Vulnerabilities

Cisco SD-WAN vEdge Software Release

First Fixed Release for These Vulnerabilities

First Fixed Release for All Vulnerabilities Described in the Collection of Advisories

Earlier than 18.4

Migrate to a fixed release.

Migrate to a fixed release.

18.4

Migrate to a fixed release.

Migrate to a fixed release.

19.2

Migrate to a fixed release.

Migrate to a fixed release.

20.1

Migrate to a fixed release.

Migrate to a fixed release.

20.3

20.3.4

Migrate to a fixed release.

20.4

20.4.1

20.4.1

20.5

20.5.1

20.5.1