CVE-2018-21070: 
NixOS vulnerability analysis and mitigation

An issue was discovered on Samsung mobile devices with N(7.x), O(8.0) devices (MSM8998 or SDM845 chipsets) software. The vulnerability, identified as CVE-2018-21070 and internally tracked as SVE-2018-11552, was discovered in May 2018. The vulnerability affects Samsung mobile devices running Android versions 7.x and 8.0 that use either MSM8998 or SDM845 chipsets (NVD).

The vulnerability stems from a missing Bootloader integrity check, which could allow an attacker to bypass Secure Boot protections. The severity of this vulnerability is rated as HIGH with a CVSS v3.1 base score of 8.4 (Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). The vulnerability is classified under CWE-354 (Improper Validation of Integrity Check Value) (NVD).

If successfully exploited, this vulnerability allows an attacker to bypass Secure Boot and obtain root access to the device. This compromises the device's security at a fundamental level, potentially allowing unauthorized code execution and system modifications (NVD).

Samsung has addressed this vulnerability through security updates. Users of affected devices should ensure they have installed the latest security patches provided by Samsung (Samsung Mobile Security).