PT-2021-24046 · Nxp · Nxp I.Mx6Ul Soc

Andrea Barisani + 1 · Published 2021-12-07 · Updated 2022-07-12 · CVE-2021-44149

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Trusted Firmware OP-TEE Trusted OS versions through 3.15.0

Description: An issue in the OPTEE-OS CSU driver for NXP i.MX6UL SoC devices lacks security access configuration for wakeup-related registers. This results in TrustZone bypass, allowing the NonSecure World to perform arbitrary memory read/write operations on Secure World memory. The issue involves a v cycle.

Recommendations: For versions through 3.15.0, consider disabling the CSU driver for NXP i.MX6UL SoC devices as a temporary workaround until a patch is available. Restrict access to the Secure World memory to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2021-44149

Affected Products

Nxp I.Mx6Ul Soc

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2021-44149 · Security Note
• https://osv.dev/vulnerability/CVE-2021-44149 · Vendor Advisory
• https://github.com/OP-TEE/optee_os/tags · Note
• https://github.com/f-secure-foundry/advisories/blob/master/Security_Advisory-Ref_FSC-HWSEC-VR2021-0002-OP-TEE_TrustZone_bypass_at_wakeup.txt · Note
• https://t.me/cvenotify/24374 · Telegram Post