CVE-2017-8850 Information

Description

An issue was discovered on OnePlus One X 2 3 and 3T devices. Due to a lenient updater-script in the OnePlus OTA images and the fact that both ROMs use the same OTA verification keys attackers can install HydrogenOS over OxygenOS and vice versa even on locked bootloaders which allows for exploitation of vulnerabilities patched on one image but not on the other in addition to expansion of the attack surface. 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 (on OnePlus 3/3T ‘Secure Start-up’ must be off).

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-2017020

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