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Security Advisory - EFM Flapping Vulnerability in Huawei Products

  • SA No:huawei-sa-20170118-01-vrp
  • Initial Release Date: Jan 18, 2017
  • Last Release Date: Jan 18, 2017

Some Huawei VRP-based products have an Ethernet in the First Mile (EFM) flapping vulnerability due to the lack of type-length-value (TLV) consistency check. An attacker may craft malformed packets and send them to a device to cause EFM flapping. (Vulnerability ID: HWPSIRT-2016-09025)

This vulnerability has been assigned a Common Vulnerabilities and Exposures (CVE) ID: CVE-2017-2712. 

Huawei has released software updates to fix this vulnerability. This advisory is available at the following link:

http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170118-01-vrp-en

Product Name

Affected Version

Resolved Product and Version

S3300

V100R006C05

Upgrade to V100R006SPH029

An attacker may craft malformed packets and send them to a device to cause EFM flapping.

The vulnerability classification has been performed by using the CVSSv3 scoring system (http://www.first.org/cvss/specification-document).

Base Score: 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

Temporal Score: 4.9 (E:F/RL:O/RC:C)

This vulnerability can be exploited only when the following conditions are present:

1. The attacker gains access to the device network.

Vulnerability details:

Due to the lack of type-length-value (TLV) consistency check, an attacker may craft malformed packets and send them to a device to cause EFM flapping.

Customers should contact Huawei TAC (Huawei Technical Assistance Center) to request the upgrades. For TAC contact information, please refer to Huawei worldwide website at http://www.huawei.com/en/psirt/report-vulnerabilities.

This vulnerability was reported to Huawei PSIRT by System Security Lab of The Chinese University of Hong Kong and Independent Researcher Zhou Li. Huawei would like to thank System Security Lab of The Chinese University of Hong Kong and Independent Researcher Zhou Li for working with us and coordinated vulnerability disclosure to protect our customers.

2017-01-18 V1.0 INITIAL

Huawei adheres to protecting the ultimate interests of users with best efforts and the principle of responsible disclosure and deal with product security issues through our response mechanism.

To enjoy Huawei PSIRT services and obtain Huawei product vulnerability information, please visit http://www.huawei.com/en/psirt.

To report a security vulnerability in Huawei products and solutions, please send it to PSIRT@huawei.com. For details, please visit http://www.huawei.com/en/psirt/report-vulnerabilities.

This document is provided on an "AS IS" basis and does not imply any kind of guarantee or warranty, either express or implied, including the warranties of merchantability or fitness for a particular purpose. In no event shall Huawei or any of its directly or indirectly controlled subsidiaries or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages. Your use of the document, by whatsoever means, will be totally at your own risk. Huawei is entitled to amend or update this document from time to time.