Privilege Escalation in FreeRTOS by Amazon Web Services
CVE-2021-43997

7.8HIGH

Key Information:

Vendor

Amazon

Status
Freertos
Vendor
CVE Published:
17 November 2021

What is CVE-2021-43997?

FreeRTOS versions 10.2.0 to 10.4.5 are susceptible to privilege escalation due to improper validation, allowing non-kernel code to call the xPortRaisePrivilege function and manipulate the system's privilege levels. In versions up to 10.4.6, attackers could exploit this flaw with crafted stack frames to further escalate privileges via the FreeRTOS MPU API. This impacts systems utilizing ARMv7-M and ARMv8-M with MPU support enabled. The vulnerability has been addressed in FreeRTOS version 10.5.0 and in version 10.4.3-LTS Patch 3.

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References

https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/...
https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/...
https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/...

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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