CVE-2021-40830: Inconsistent CA override function behavior within AWS IoT Device SDKs on Unix systems
First published: Mon Nov 22 2021(Updated: )
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 Unix systems. 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 override the default trust store. This corrects this issue. This issue affects: Amazon Web Services AWS IoT Device SDK v2 for Java versions prior to 1.5.0 on Linux/Unix. Amazon Web Services AWS IoT Device SDK v2 for Python versions prior to 1.6.1 on Linux/Unix. Amazon Web Services AWS IoT Device SDK v2 for C++ versions prior to 1.12.7 on Linux/Unix. Amazon Web Services AWS IoT Device SDK v2 for Node.js versions prior to 1.5.3 on Linux/Unix. Amazon Web Services AWS-C-IO 0.10.4 on Linux/Unix.
Credit: cve-notifications-us@f-secure.com cve-notifications-us@f-secure.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Amazon Amazon Web Services Aws-c-io | =0.10.4 | |
| Amazon Amazon Web Services Internet Of Things Device Software Development Kit V2 | <1.5.0 | |
| Amazon Amazon Web Services Internet Of Things Device Software Development Kit V2 | <1.5.3 | |
| Amazon Amazon Web Services Internet Of Things Device Software Development Kit V2 | <1.6.1 | |
| Amazon Amazon Web Services Internet Of Things Device Software Development Kit V2 | <1.12.7 | |
| Linux Linux kernel | ||
| Opengroup Unix | ||
| pip/awsiotsdk | <1.6.1 | 1.6.1 |
| npm/aws-iot-device-sdk-v2 | <1.5.3 | 1.5.3 |
| maven/software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk | <1.5.0 | 1.5.0 |
| All of | ||
| Any of | ||
| Amazon Amazon Web Services Aws-c-io | =0.10.4 | |
| Amazon Amazon Web Services Internet Of Things Device Software Development Kit V2 | <1.5.0 | |
| Amazon Amazon Web Services Internet Of Things Device Software Development Kit V2 | <1.5.3 | |
| Amazon Amazon Web Services Internet Of Things Device Software Development Kit V2 | <1.6.1 | |
| Amazon Amazon Web Services Internet Of Things Device Software Development Kit V2 | <1.12.7 | |
| Any of | ||
| Linux Linux kernel | ||
| Opengroup Unix |
Remedy
Update to the latest versions of the AWS IoT Device SDK.
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Reference Links
- https://github.com/aws/aws-iot-device-sdk-cpp-v2
- https://github.com/aws/aws-iot-device-sdk-java-v2
- https://github.com/aws/aws-iot-device-sdk-js-v2
- https://github.com/aws/aws-iot-device-sdk-python-v2
- https://github.com/awslabs/aws-c-io/
- https://nvd.nist.gov/vuln/detail/CVE-2021-40830
- https://github.com/aws/aws-iot-device-sdk-java-v2/commit/67950ad2a02f2f9355c310b69dc9226b017f32f2
- https://github.com/aws/aws-iot-device-sdk-js-v2/commit/53a36e3ac203291494120604d416b6de59177cac
- https://github.com/aws/aws-iot-device-sdk-python-v2/commit/0450ce68add7e3d05c6d781ecdac953c299c053a
- https://github.com/advisories/GHSA-c4rh-4376-gff4 (Advisory)
- https://github.com/awslabs/aws-c-io
- https://github.com/pypa/advisory-database/tree/main/vulns/awsiotsdk/PYSEC-2021-863.yaml
Frequently Asked Questions
What is the vulnerability ID for this AWS IoT Device SDK vulnerability?
The vulnerability ID for this AWS IoT Device SDK vulnerability is CVE-2021-40830.
What is the severity score of CVE-2021-40830?
CVE-2021-40830 has a severity score of 8.8 (high).
Which software versions are affected by this vulnerability?
The AWS IoT Device SDK versions 0.10.4, up to exclusive 1.5.0 for Java, 1.5.3 for Node.js, 1.6.1 for Python, and 1.12.7 for C++ are affected by this vulnerability.
How does this vulnerability affect TLS handshakes?
TLS handshakes will succeed if the peer can be verified either from the user-supplied CA or the system's default trust-store.
How can I fix the CVE-2021-40830 vulnerability in AWS IoT Device SDK?
To fix the CVE-2021-40830 vulnerability, update your AWS IoT Device SDK to a version that is not affected by this vulnerability.
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