CVE-2021-36369
Dropbear SSH Authentication Hijacking Vulnerability
Description
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.
INFO
Published Date :
Oct. 12, 2022, 9:15 p.m.
Last Modified :
Nov. 21, 2024, 6:13 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-36369 has a 2 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-36369
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-36369.
| URL | Resource |
|---|---|
| https://github.com/mkj/dropbear/pull/128 | Third Party Advisory |
| https://github.com/mkj/dropbear/releases | Release Notes Third Party Advisory |
| https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82 | Release Notes Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/11/msg00015.html | Mailing List Third Party Advisory |
| https://github.com/mkj/dropbear/pull/128 | Third Party Advisory |
| https://github.com/mkj/dropbear/releases | Release Notes Third Party Advisory |
| https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82 | Release Notes Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/11/msg00015.html | Mailing List Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Findings regarding controlling a Unifi USP-PDU-PRO via SSH
Shell
linux related informations about RevoPoint Pop2
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-36369 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-36369 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/mkj/dropbear/pull/128 Added Reference https://github.com/mkj/dropbear/releases Added Reference https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82 Added Reference https://lists.debian.org/debian-lts-announce/2022/11/msg00015.html -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Jan. 20, 2023
Action Type Old Value New Value Changed Reference Type https://lists.debian.org/debian-lts-announce/2022/11/msg00015.html No Types Assigned https://lists.debian.org/debian-lts-announce/2022/11/msg00015.html Mailing List, Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Nov. 14, 2022
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2022/11/msg00015.html [No Types Assigned] -
Initial Analysis by [email protected]
Oct. 14, 2022
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://github.com/mkj/dropbear/pull/128 No Types Assigned https://github.com/mkj/dropbear/pull/128 Third Party Advisory Changed Reference Type https://github.com/mkj/dropbear/releases No Types Assigned https://github.com/mkj/dropbear/releases Release Notes, Third Party Advisory Changed Reference Type https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82 No Types Assigned https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82 Release Notes, Third Party Advisory Added CWE NIST CWE-287 Added CPE Configuration OR *cpe:2.3:a:dropbear_ssh_project:dropbear_ssh:*:*:*:*:*:*:*:* versions up to (including) 2020.81
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-36369 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-36369
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.12 }} 0.03%
score
0.47100
percentile