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IPV6 VLAN Stacking Vulnerability

IPV6 VLAN Stacking Vulnerability

IPV6 VLAN Stacking Vulnerability

Lenovo Security Advisory: LEN-68035

Potential Impact: Denial-of-service, man-in-the-middle attack

Severity: Medium

Scope of Impact: Industry-wide

CVE Identifier: CVE-2021-27853, CVE-2021-27854, CVE-2021-27861, CVE-2021-27862

 

Summary Description:

Network security controls can be bypassed by stacking Ethernet protocol headers. An attacker can send these crafted network packets and exploit vulnerable devices by bypassing their inspection and filtering capabilities.

 

Mitigation Strategy for Customers (what you should do to protect yourself):

Update system firmware to the version (or newer) indicated for your model in the Product Impact section.

 

Product Impact:

To download the version specified for your product below, follow these steps:

Navigate to the Drivers & Software support site for your product:

  1. Search for your product by name or machine type.
  2. Click Drivers & Software on the left menu panel.
  3. Click on Manual Update to browse by Component type.
  4. Compare the minimum fix version for your product from the applicable product table below with the latest version posted on the support site.

Lenovo also offers tools to assist with update management as an alternative to the manual steps described above. Refer to the following for additional help:

PC Products and Software: https://support.lenovo.com/us/en/solutions/ht504759

Server and Enterprise Software: https://support.lenovo.com/us/en/solutions/lnvo-lxcaupd and https://datacentersupport.lenovo.com/us/en/documents/lnvo-center

 

Click below links to view affected products:

Networking Switches

 

References:

VU #855201

 

Revision History:

Revision Date Description
1 2022-10-11 Initial release

For a complete list of all Lenovo Product Security Advisories, click here.

For the most up to date information, please remain current with updates and advisories from Lenovo regarding your equipment and software. The information provided in this advisory is provided on an “as is” basis without any warranty or guarantee of any kind. Lenovo reserves the right to change or update this advisory at any time.

 

Product Impact:

Networking Switches

Product Component Minimum Fixed Version
Broadcom - BES 53248 Networking Switch BES 53248 Networking switch 3.9

Alias Id:LEN-68035
Document ID:PS500520
Original Publish Date:10/11/2022
Last Modified Date:11/04/2022