CVE-2021-36369
CVE-2021-36369
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 7.5 · High · EPSS 1.9% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
n/a
- Versions
- n/a: Affected
No fix published
dropbear Debian:12
- Affected ranges
- ECOSYSTEM: < 2022.82-1
Update to 2022.82-1
dropbear Debian:13
- Affected ranges
- ECOSYSTEM: < 2022.82-1
Update to 2022.82-1
dropbear Debian:14
- Affected ranges
- ECOSYSTEM: < 2022.82-1
Update to 2022.82-1
dropbear Ubuntu:16.04:LTS
- Versions
- 2014.65-1ubuntu2
- 2015.68-1
- 2015.70-1
- 2015.71-1
- 2016.72-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
dropbear Ubuntu:Pro:18.04:LTS
- Versions
- 2017.75-2
- 2017.75-3build1
- Affected ranges
- ECOSYSTEM: < 2017.75-3ubuntu0.1~esm1
Update to 2017.75-3ubuntu0.1~esm1
dropbear Ubuntu:Pro:20.04:LTS
- Versions
- 2019.78-2build1
- Affected ranges
- ECOSYSTEM: < 2019.78-2ubuntu0.1~esm1
Update to 2019.78-2ubuntu0.1~esm1
dropbear Ubuntu:22.04:LTS
- Versions
- 2020.81-3
- 2020.81-4
- 2020.81-5
- Affected ranges
- ECOSYSTEM: < 2020.81-5ubuntu0.1
Update to 2020.81-5ubuntu0.1