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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Dropbear Ssh Project | Dropbear Ssh | <= 2020.81 |
| Debian | Debian Linux | 10.0 |
Related Weaknesses (CWE)
References
- https://github.com/mkj/dropbear/pull/128Third Party Advisory
- https://github.com/mkj/dropbear/releasesRelease NotesThird Party Advisory
- https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82Release NotesThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00015.htmlMailing ListThird Party Advisory
- https://github.com/mkj/dropbear/pull/128Third Party Advisory
- https://github.com/mkj/dropbear/releasesRelease NotesThird Party Advisory
- https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82Release NotesThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00015.htmlMailing ListThird Party Advisory
FAQ
What is CVE-2021-36369?
CVE-2021-36369 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 th...
How severe is CVE-2021-36369?
CVE-2021-36369 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-36369?
Check the references section above for vendor advisories and patch information. Affected products include: Dropbear Ssh Project Dropbear Ssh, Debian Debian Linux.