Improper Authentication Affecting dropbear package, versions *


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.12% (48th percentile)

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  • Snyk IDSNYK-UBUNTU2004-DROPBEAR-3043206
  • published27 Sept 2024
  • disclosed12 Oct 2022

Introduced: 12 Oct 2022

CVE-2021-36369  (opens in a new tab)
CWE-287  (opens in a new tab)

How to fix?

There is no fixed version for Ubuntu:20.04 dropbear.

NVD Description

Note: Versions mentioned in the description apply only to the upstream dropbear package and not the dropbear package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

An issue was discovered in Dropbear through 2020.81. Due to a non-RFC-compliant check of the available authentication methods in the client-side SSH code, it is possible for an SSH server to change the login process in its favor. This attack can bypass additional security measures such as FIDO2 tokens or SSH-Askpass. Thus, it allows an attacker to abuse a forwarded agent for logging on to another server unnoticed.

CVSS Scores

version 3.1