PT-2021-4250 · Amazon+6 · Nitro Enclaves+6

Guilherme De Almeida Suckevicz · Published 2021-04-29 · Updated 2022-06-03 · CVE-2021-3543

Positive Technologies (AI Summary)

CVSS v2.0

7.2

High

Base vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Linux (affected versions not specified)

Description The issue is related to a null pointer dereference error in the Nitro Enclaves kernel driver when closing an enclave file descriptor. This could allow an attacker to access confidential data, compromise data integrity, and cause a denial of service. A local user of a host machine could exploit this flaw to crash the system or escalate their privileges.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

NULL Pointer Dereference

Use After Free

Weakness Enumeration

CWE-476

CWE-416

Related Identifiers

ALSA-2021:2168

BDU:2021-04858

CESA-2021_2168

CESA-2021_2169

CVE-2021-3543

RHSA-2021:2168

RHSA-2021:2169

RHSA-2021_2168

RHSA-2021_2169

RLSA-2021:2168

USN-4997-1

USN-4997-2

USN-5001-1

Affected Products

Almalinux

Centos

Linuxmint

Nitro Enclaves

Red Hat

Rocky Linux

Ubuntu

References · 40

• 🔥 https://github.com/nrb547/kernel-exploitation/blob/main/cve-2021-3609/cve-2021-3609.md · Exploit
• 🔥 https://lore.kernel.org/lkml/[e-mail] · Exploit
• https://linux.oracle.com/errata/ELSA-2021-2168.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-26139 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3543 · Security Note
• https://ubuntu.com/security/notices/USN-5001-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-24587 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-24586 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-3543 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-24588 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04858 · Security Note
• https://osv.dev/vulnerability/USN-5001-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-33034 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-3543 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-3543 · Vendor Advisory