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Security Advisory - DoS Vulnerability in Huawei U1900 CLI Module

  • SA No:Huawei-SA-20150909-01-U1900
  • Initial Release Date: Sep 09, 2015
  • Last Release Date: Sep 09, 2015


Huawei eSpace U1900 switch series provides professional IP voice solutions to meet communications requirements from various enterprises of different sizes. Huawei eSpace U1900 series includes eSpace U1910, U1911, U1930, U1960, U1980, and U1981.

The U1900 series uses the Command Line Interface (CLI) module to process command line login and interaction. The CLI module enables CLI clients to log in to the U1900 devices and to manage and maintain U1900 devices using command lines.

A vulnerability exists in the exception handling mechanism of the U1900 CLI module. An attacker may exploit this vulnerability to launch DoS attacks, which make the CLI function unavailable. (Vulnerability ID: HWPSIRT-2015-08046)

Product Name

Affected Version

Resolved Product and Version

eSpace U1910/U1911/U1930/U1960/U1980/U1981

V100R001C20

V100R001C20SPH605


An attacker may exploit this vulnerability to launch DoS attacks, which make the CLI function unavailable.

The vulnerability classification has been performed by using the CVSSv2 scoring system (http://www.first.org/cvss/).

Base Score: 5.0 (AV:N/AC:L/Au:N/C:N/I:N/A:P)

Temporal Score: 4.1 (E:F/RL:O/RC:C)

1. Prerequisite:

The attacker can access the device network.

2. Attacking procedure:

The attacker accesses the network that the U1900 series resides. If a user uses SSH to log in to the CLI module, the attacker sends specific abnormal packets to the U1900 devices and makes the CLI function unavailable because the U1900 devices handles such exceptions improperly.

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/security/psirt/report-vulnerabilities/index.htm.

This vulnerability was reported privately to Huawei by Mickey Shkatov from Intel Advanced Threat Research Team and Jesse Michael from Intel. Huawei expresses our appreciation for Mickey Shkatov’s and Jesse Michael’s coordinated vulnerability disclosure with Huawei.

Huawei PSIRT is not aware of any malicious use of the vulnerabilities described in this advisory.

For security problems about Huawei products and solutions, please contact PSIRT@huawei.com.

For general problems about Huawei products and solutions, please directly contact Huawei TAC (Huawei Technical Assistance Center) to request the configuration or technical assistance.

2015-09-09 V1.0 INITIAL

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.

Complete information on providing feedback on security vulnerability of Huawei products, getting support for Huawei security incident response services, and obtaining Huawei security vulnerability information, is available on Huawei's worldwide website at http://www.huawei.com/en/security/psirt/.