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CVE-2021-3543

Good to know:

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Date: June 1, 2021

A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.

Language: RUST

Severity Score

Related Resources (10)

https://bugzilla.redhat.com/show_bug.cgi?id=1953022
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3543
https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs@amazon.com/
https://github.com/aws/aws-nitro-enclaves-cli/commit/1d0307fd82653b6b6aa1dcb1b3e34321d18ea900
https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs%40amazon.com/
https://access.redhat.com/security/cve/CVE-2021-3543
https://lore.kernel.org/lkml/20210429165941.27020-1-andraprs@amazon.com/
https://nvd.nist.gov/vuln/detail/CVE-2021-3543
https://security-tracker.debian.org/tracker/CVE-2021-3543
https://www.mend.io/vulnerability-database/CVE-2021-3543

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

Use After Free

CWE-416

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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