Homepage
About Snyk

Improper Certificate Validation Affecting awscrt package, versions [,0.12.0)

0.0
medium

Snyk CVSS

    Attack Complexity High
    Privileges Required High
    User Interaction Required
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.19% (56th percentile)
Expand this section
NVD
7.2 high

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk ID SNYK-PYTHON-AWSCRT-1924914
  • published 23 Nov 2021
  • disclosed 23 Nov 2021
  • credit Unknown
Report a new vulnerability Found a mistake?

Introduced: 23 Nov 2021

CVE-2021-40831 Open this link in a new tab
CWE-295 Open this link in a new tab

How to fix?

Upgrade awscrt to version 0.12.0 or higher.

Overview

awscrt is an A common runtime for AWS Python projects

Affected versions of this package are vulnerable to Improper Certificate Validation. It 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 with ability to compromise a CA 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.