CVE-2022-20084: 
NixOS vulnerability analysis and mitigation

CVE-2022-20084 is a high-severity vulnerability discovered in MediaTek's telephony system. The vulnerability, identified in May 2022, stems from a missing permission check that could allow disabling of emergency broadcasts. This vulnerability affects various MediaTek chipsets running Android versions 10.0, 11.0, and 12.0 (MediaTek Bulletin).

The vulnerability is classified as an Elevation of Privilege (EoP) issue, with a CWE-862 Missing Authorization classification. The technical root cause is attributed to a missing permission check in the telephony component that could enable unauthorized control over emergency broadcast functionality. The vulnerability requires no additional execution privileges for exploitation and can be triggered without user interaction (MediaTek Bulletin).

The vulnerability could allow an attacker to disable emergency broadcasts on affected devices. This poses a significant security risk as it could prevent users from receiving critical emergency notifications. The attack requires no additional execution privileges and can be executed without user interaction (MediaTek Bulletin).

MediaTek has addressed this vulnerability through patch ID: ALPS06498874. The fix was included in the May 2022 security bulletin. Users of affected devices should ensure their systems are updated with the latest security patches (MediaTek Bulletin).