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Improper certificate management in AWS IoT Device SDK v2

Moderate severity GitHub Reviewed Published Nov 24, 2021 to the GitHub Advisory Database • Updated Sep 12, 2024

Package

npm aws-iot-device-sdk-v2 (npm)

Affected versions

< 1.6.0

Patched versions

1.6.0
pip awsiotsdk (pip)
< 1.7.0
1.7.0
maven software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk (Maven)
< 1.5.0
1.5.0

Description

The AWS IoT Device SDK v2 for Java, Python, C++ and Node.js appends a user supplied Certificate Authority (CA) to the root CAs instead of overriding it on macOS systems. Additionally, SNI validation is also not enabled when the CA has been "overridden". TLS handshakes will thus succeed if the peer can be verified either from the user-supplied CA or the system’s default trust-store. Attackers with access to a host’s trust stores or are able to compromise a certificate authority already in the host's trust store (note: the attacker must also be able to spoof DNS in this case) may be able to use this issue to bypass CA pinning. An attacker could then spoof the MQTT broker, and either drop traffic and/or respond with the attacker's data, but they would not be able to forward this data on to the MQTT broker because the attacker would still need the user's private keys to authenticate against the MQTT broker. The aws_tls_ctx_options_override_default_trust_store_* function within the aws-c-io submodule has been updated to address this behavior. This issue affects: Amazon Web Services AWS IoT Device SDK v2 for Java versions prior to 1.5.0 on macOS. Amazon Web Services AWS IoT Device SDK v2 for Python versions prior to 1.7.0 on macOS. Amazon Web Services AWS IoT Device SDK v2 for C++ versions prior to 1.14.0 on macOS. Amazon Web Services AWS IoT Device SDK v2 for Node.js versions prior to 1.6.0 on macOS. Amazon Web Services AWS-C-IO 0.10.7 on macOS.

References

Published by the National Vulnerability Database Nov 23, 2021
Reviewed Nov 24, 2021
Published to the GitHub Advisory Database Nov 24, 2021
Last updated Sep 12, 2024

Severity

Moderate

EPSS score

0.188%
(57th percentile)

Weaknesses

CVE ID

CVE-2021-40831

GHSA ID

GHSA-j3f7-7rmc-6wqj

Source code

No known source code
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