CVE-2021-36369
Published: 12 October 2022
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.
Priority
Status
Package | Release | Status |
---|---|---|
dropbear Launchpad, Ubuntu, Debian |
trusty |
Ignored
(end of standard support)
|
upstream |
Needs triage
|
|
xenial |
Needs triage
|
|
kinetic |
Ignored
(end of life, was needs-triage)
|
|
bionic |
Needs triage
|
|
focal |
Needs triage
|
|
jammy |
Needs triage
|
|
mantic |
Needs triage
|
|
lunar |
Ignored
(end of life, was needs-triage)
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.5 |
Attack vector | Network |
Attack complexity | Low |
Privileges required | None |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | High |
Availability impact | None |
Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |