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Security Advisory - PXN Defense Mechanism Failure Vulnerability in Huawei Mobile Phones

  • SA No:huawei-sa-20161026-01-pxn
  • Initial Release Date: Oct 26, 2016
  • Last Release Date: Nov 23, 2016

There is a Privileged Execute-Never (PXN) defense mechanism failure vulnerability in the drive code of some Huawei mobile phones. An attacker may trick users into installing malicious apps which can disable the PXN defense mechanism by invoking related drive code to crash the system or escalate privilege. (Vulnerability ID: HWPSIRT-2016-07005)
This vulnerability has been assigned CVE ID: CVE-2016-8768.
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-20161026-01-pxn-en

Product Name

Affected Version

Resolved Product and Version

Honor 6/ Honor 6 Plus/ Honor 7

Versions earlier than 6.9.16

6.9.16[1]


[1] The product user who submits the upgrade application in huawei club website (https://www.wenjuan.com/s/YBNzIj/) will receive a system update prompt, install the update can fix the vulnerability.

Successful exploitation of the vulnerabilities allows attackers to crash the system or escalate user privilege.
The vulnerability classification has been performed by using the CVSSv2 scoring system (http://www.first.org/cvss/).

Base Score: 6.2 (AV:L/AC:H/Au:N/C:C/I:C/A:C) 
Temporal Score: 5.1 (E:F/RL:O/RC:C)
1. Prerequisite:
The attacker successfully tricks a user into installing a malicious application on the smart phone.
2. Attacking procedure:
An attacker may trick users into installing malicious apps which can disable the PXN defense mechanism by invoking related drive code to crash the system or escalate privilege.

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 first reported to Huawei PSIRT by Zhao Jianqiang and Chen Gengjia from 360 IceSword Lab, WangQize in ADLab of Venustech and Zhu Bin from VPP Security Team and Pan Yu from 360 Vulpecker Team also reported the problem to Huawei PSIRT later. Huawei would like to thank Zhao Jianqiang, Chen Gengjia, Wang Qize, Zhu Bin and Pan Yu for working with us and coordinated vulnerability disclosure to protect our customers.

2016-11-23 V1.1 UPDATE Updated the Summary and CVSS Score
2016-10-26 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.

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