Policy Bypass and Oracle-Based Decryption in Mbed TLS by ARM
CVE-2021-45451

7.5HIGH

Key Information:

Vendor

Arm
Status
Mbed Tls
Vendor
CVE Published:
21 December 2021

What is CVE-2021-45451?

In Mbed TLS versions prior to 3.1.0, a flaw exists in the psa_aead_generate_nonce function that allows an untrusted application to bypass security policies or exploit oracle-based decryption opportunities when the output buffer is located in memory regions accessible to the application. This weakness can potentially lead to unauthorized access to sensitive data, emphasizing the importance of upgrading to the latest version to mitigate risks.

References

https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisory
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisory

CVSS V3.1

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

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.