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CVE-2022-20002

Status Candidate

Overview

In incfs, there is a possible way of mounting on arbitrary paths due to a missing permission check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12LAndroid ID: A-198657657

Related Files

Android vold Unsafe Mounting
Posted Dec 2, 2021
Authored by Jann Horn, Google Security Research

Android's vold's incremental-fs APIs trust paths from system_server for mounting. There is supposed to be privilege separation between vold (TCB) and system_server (privileged process). However, vold's IPC handlers related to incremental-fs (mountIncFs, unmountIncFs, bindMount) allow system_server to specify semi-arbitrary paths, allowing system_server to trigger mounting on directories that shouldn't be under system_server control.

tags | exploit, arbitrary
advisories | CVE-2022-20002
SHA-256 | 6308f611ecd07bd987f8455171c29a25eff87e81ccf2cc8daeca7812645ea262
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