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.
Published 2021-11-23 00:15:07
Updated 2021-12-02 14:51:00
Source F-Secure
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-40830

0.09%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 40 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-40830

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.8
MEDIUM AV:A/AC:L/Au:N/C:P/I:P/A:P
6.5
6.4
NIST
6.3
MEDIUM CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
0.4
5.9
F-Secure
8.8
HIGH CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.8
5.9
NIST

CWE ids for CVE-2021-40830

References for CVE-2021-40830

Products affected by CVE-2021-40830

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