StartTLS Vulnerability in Ruby's IMAP Library Affecting Various Versions
CVE-2021-32066

7.4HIGH

Key Information:

Vendor

Ruby-lang

Status
Ruby
Vendor
CVE Published:
1 August 2021

What is CVE-2021-32066?

A vulnerability in the Net::IMAP component of Ruby allows man-in-the-middle attackers to exploit the lack of exception raising when StartTLS fails due to an unknown response. This oversight can lead to a StartTLS stripping attack, enabling an attacker positioned between the client and the server to inhibit the StartTLS command, compromising the encrypted communication channel intended to protect sensitive data.

References

https://hackerone.com/reports/1178562
https://lists.debian.org/debian-lts-announce/2021/10/msg0...
mailing-list
https://www.oracle.com/security-alerts/cpuapr2022.html

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.