#VU65106 Input validation error in Pixel - CVE-2021-39733

Vulnerability identifier: #VU65106

Vulnerability risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-39733

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Pixel
Mobile applications / Mobile firmware & hardware

Vendor: Google

Description

The vulnerability allows a local application to escalate privileges on the system.

The vulnerability exists due to insufficient validation of user-supplied input in amcs_cdev_unlocked_ioctl of audiometrics.c. A local application with system privileges can trigger the vulnerability and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Pixel: before 2022-03-05

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External links
https://source.android.com/security/bulletin/pixel/2022-03-01

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.