CVEvulnerability
CVE-2021-36369
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2022-10-12
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weaknesses
- CWE-287
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.
Affected configurations
• dropbear ssh project dropbear ssh (<= 2020.81)
• debian debian linux 10.0
Related
Weakness · CWE (1)
- CWE-287 Improper Authentication weakness
References
- 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