CVE-2021-36369

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.13%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory debian.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/mkj/dropbear/pull/128 third party advisory
https://github.com/mkj/dropbear/releases third party advisory release notes
https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82 third party advisory release notes
https://lists.debian.org/debian-lts-announce/2022/11/msg00015.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2021-36369?
CVE-2021-36369 has been scored as a high severity vulnerability.
How to fix CVE-2021-36369?
To fix CVE-2021-36369, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-36369 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-36369 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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