PT-2022-9135 · Google · Android

Published 2022-08-24 · Updated 2023-08-08 · CVE-2021-0947

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions Android versions prior to the fixed version

Description The issue arises from the method PVRSRVBridgeTLDiscoverStreams, which allocates a buffer on the heap and fills it via TLServerDiscoverStreamsKM. If TLServerDiscoverStreamsKM fails due to reasons like invalid sizes, the buffer remains uninitialized but is still copied to userspace, leading to a kernel leak of uninitialized heap data. This can occur without requiring any privileges.

Recommendations For Android versions prior to the fixed version, consider restricting access to the TLServerDiscoverStreamsKM method until a patch is available. As a temporary workaround, disabling the PVRSRVBridgeTLDiscoverStreams method may help minimize the risk of exploitation.

Fix

Weakness Enumeration

CWE-909

Related Identifiers

CVE-2021-0947

Affected Products

Android

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2021-0947 · Security Note
• https://source.android.com/security/bulletin/2022-08-01 · Vendor Advisory
• https://t.me/cibsecurity/48649 · Telegram Post