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.

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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

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