Buffer Comparison Flaw in Trusted Firmware-M's CryptoCell Integration
CVE-2023-40271

7.5HIGH

Key Information:

Vendor

Arm
Status
Trusted Firmware-m
Vendor
CVE Published:
8 September 2023

What is CVE-2023-40271?

An issue in Trusted Firmware-M, specifically in versions utilizing the CryptoCell accelerator with the ChaCha20-Poly1305 algorithm, allows a potential authentication compromise. The single-part verification function erroneously compares only the first 4 bytes of the authentication tag, instead of the full 16 bytes. This flaw could lead to unauthenticated payloads being mistakenly identified as authentic, posing significant risks in secure application deployments.

References

https://tf-m-user-guide.trustedfirmware.org/releases/inde...
https://git.trustedfirmware.org/TF-M/trusted-firmware-m.g...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.