CVE Vulnerabilities

CVE-2021-0304

Incorrect Permission Assignment for Critical Resource

Published: Jan 11, 2021 | Modified: Jul 12, 2022
CVSS 3.x
5.5
MEDIUM
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS 2.x
4.9 MEDIUM
AV:L/AC:L/Au:N/C:C/I:N/A:N
RedHat/V2
RedHat/V3
Ubuntu

In several functions of GlobalScreenshot.java, there is a possible permission bypass due to an unsafe PendingIntent. This could lead to local information disclosure of the users contacts with User execution privileges needed. User interaction is not needed for exploitation. Product: Android; Versions: Android-10, Android-8.0, Android-8.1, Android-9; Android ID: A-162738636.

Weakness

The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.

Affected Software

Name Vendor Start Version End Version
Android Google 8.0 8.0
Android Google 8.1 8.1
Android Google 9.0 9.0
Android Google 10.0 10.0

Potential Mitigations

  • Run the code in a “jail” or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
  • OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
  • This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
  • Be careful to avoid CWE-243 and other weaknesses related to jails.

References