CVE-2021-32066 Detail

Current Description

An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. Net::IMAP does not raise an exception when StartTLS fails with an an unknown response, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.4 HIGH
Vector:  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N


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Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://github.com/ruby/ruby/commit/a21a3b7d23704a01d34bd79d09dc37897e00922a Patch  Third Party Advisory 
https://hackerone.com/reports/1178562 Exploit  Patch  Third Party Advisory 
https://security.netapp.com/advisory/ntap-20210902-0004/
https://www.ruby-lang.org/en/news/2021/07/07/starttls-stripping-in-net-imap/ Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-326 Inadequate Encryption Strength cwe source acceptance level NIST  

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-32066
NVD Published Date:
08/01/2021
NVD Last Modified:
09/02/2021
Source:
MITRE