PT-2021-20920 · Arm+1 · Arm Cortex-M33+3

Published 2021-08-23 · Updated 2022-07-12 · CVE-2021-35465

Positive Technologies (AI Summary)

CVSS v2.0

3.6

Low

Base vector

AV:L/AC:L/Au:N/C:P/I:P/A:N

Name of the Vulnerable Software and Affected Versions: Arm Cortex-M33 versions r0p0 through r1p0 Arm Cortex-M35P version r0 Arm Cortex-M55 versions r0p0 through r1p0 Arm China STAR-MC1 (in the STAR SE configuration)

Description: The issue arises from certain Arm products not properly considering the effect of exceptions on a VLLDM instruction, allowing a Non-secure handler to have read or write access to part of a Secure context.

Recommendations: For Arm Cortex-M33 versions r0p0 through r1p0, update to a version released after 2021-08-23 to resolve the issue. For Arm Cortex-M35P version r0, update to a version released after 2021-08-23 to resolve the issue. For Arm Cortex-M55 versions r0p0 through r1p0, update to a version released after 2021-08-23 to resolve the issue. For Arm China STAR-MC1 (in the STAR SE configuration), update to a version released after 2021-08-23 to resolve the issue.

Fix

Related Identifiers

CVE-2021-35465

Affected Products

Arm China Star-Mc1

Arm Cortex-M33

Arm Cortex-M35P

Arm Cortex-M55

References · 7

• https://developer.arm.com/support/arm-security-updates · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-35465 · Vendor Advisory
• https://developer.arm.com/support/arm-security-updates/vlldm-instruction-security-vulnerability · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-35465 · Security Note
• https://t.me/cvenotify/21250 · Telegram Post
• https://t.me/cibsecurity/27697 · Telegram Post
• https://t.me/cvenotify/20297 · Telegram Post