CVE-2017-8851 Information

Description

An issue was discovered on OnePlus One and X devices. Due to a lenient updater-script on the OnePlus One and X OTA images the fact that both products use the same OTA verification keys and the fact that both products share the same ‘ro.build.product’ system property attackers can install OTAs of one product over the other even on locked bootloaders. That could theoretically allow for exploitation of vulnerabilities patched on one image but not on the other in addition to expansion of the attack surface. Moreover the vulnerability may result in having the device unusable until a Factory Reset is performed. This vulnerability can be exploited by Man-in-the-Middle (MiTM) attackers targeting the update process. This is possible because the update transaction does not occur over TLS (CVE-2016-10370). In addition physical attackers can reboot the phone into recovery and then use ‘adb sideload’ to push the OTA.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

https://alephsecurity.com/vulns/aleph-2017021

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

5.9