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Security Advisory-WPS PIN Offline Brute Force Cracking Vulnerability in Huawei Home Gateway Products

  • SA No: Huawei-SA-20141224-01-WPSPIN
  • Initial Release Date: Dec 24, 2014
  • Last Release Date: Dec 24, 2014

Some Huawei home gateways are affected by the PIN offline brute force cracking vulnerability of the WPS protocol because the random number generator (RNG) used in the supplier’s solution is not random enough. As a result, brute force cracking the PIN code is easier. After an attacker cracks the PIN, the attacker can access the Internet via the cracked device (Vulnerability ID: HWPSIRT-2014-0939).
This vulnerability has been assigned a CVE ID: CVE-2014-9690.

Product name

Affected Version

Resolved Product and Version


V100R001C01B022 and earlier versions


After an attacker cracks the PIN of the WPS protocol on the device, the attacker can use the WPS to access the Internet.

The vulnerability classification has been performed by using the CVSSv2 scoring system (

Base Score: 6.4 (AV:N/AC:L/Au:N/C:P/I:N/A:P)

Temporal Score: 5.3 (E:F/RL:O/RC:C)

1. Prerequisite:

a. The attacker intercepts a packet exchange of a legitimate user when the user logs in to the device through WPS.

b. The attacker uses reverse engineering to derive the algorithm used in the RNG.

2. Vulnerability details:

The RNG in some products is not random enough. As a result, an attacker can intercept and analyze WPS protocol packets to figure out the key information used for encrypting the PIN in subsequent WPS protocol packets. The key information makes brute force PIN cracking easier and the attacker can crack the PIN in minutes.

To crack the PIN, the attacker must know the algorithm of the RNG. Therefore, there is no method to attack all devices that support WPS and the attack difficulty depends on the complexity of the RNG algorithm.

Customers should contact Huawei TAC (Huawei Technical Assistance Center) to request the upgrades. For TAC contact information, please refer to Huawei worldwide website at

This vulnerability was reported by Dominique Bongard. Huawei PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

For security problems about Huawei products and solutions, please

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

2014-12-24 V1.0 INITIAL
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