SB2020010831 - Incorrect default permissions in Google, Google Android

Description

This security bulletin contains information about 1 vulnerability.

1) Incorrect default permissions (CVE-ID: CVE-2020-0009)

CWE-ID: CWE-276 - Incorrect Default Permissions

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local authenticated user to manipulate data.

In calc_vm_may_flags of ashmem.c, there is a possible arbitrary write to shared memory due to a permissions bypass. This could lead to local escalation of privilege by corrupting memory shared between processes, with no additional execution privileges needed. User interaction is not needed for exploitation. Product: Android Versions: Android kernel Android ID: A-142938932

Remediation

Install update from vendor's website.

References

• http://packetstormsecurity.com/files/155903/Android-ashmem-Read-Only-Bypasses.html
• https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
• https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
• https://source.android.com/security/bulletin/2020-01-01