CVE-2021-40831
7.2 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7 Medium
AI Score
Confidence
High
6 Medium
CVSS2
Access Vector
Access Complexity
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:P/I:P/A:P
0.002 Low
EPSS
Percentile
56.2%
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.
Affected configurations
CNA Affected
[
{
"platforms": [
"macOS"
],
"product": "AWS IoT Device SDK v2 for Java ",
"vendor": "Amazon Web Services",
"versions": [
{
"lessThan": "1.5.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"platforms": [
"macOS"
],
"product": "AWS IoT Device SDK v2 for Python",
"vendor": "Amazon Web Services",
"versions": [
{
"lessThan": "1.7.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"platforms": [
"macOS"
],
"product": "AWS IoT Device SDK v2 for C++",
"vendor": "Amazon Web Services",
"versions": [
{
"lessThan": "1.14.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"platforms": [
"macOS"
],
"product": "AWS IoT Device SDK v2 for Node.js",
"vendor": "Amazon Web Services",
"versions": [
{
"lessThan": "1.6.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"platforms": [
"macOS"
],
"product": "AWS-C-IO",
"vendor": "Amazon Web Services",
"versions": [
{
"status": "affected",
"version": "0.10.7"
}
]
}
]Related
7.2 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7 Medium
AI Score
Confidence
High
6 Medium
CVSS2
Access Vector
Access Complexity
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:P/I:P/A:P
0.002 Low
EPSS
Percentile
56.2%