CVE-2021-36369
Publication date 12 October 2022
Last updated 26 February 2025
Ubuntu priority
Cvss 3 Severity Score
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.
Status
Package | Ubuntu Release | Status |
---|---|---|
dropbear | 24.10 oracular |
Fixed 2020.81-3+deb11u1
|
24.04 LTS noble |
Fixed 2020.81-3+deb11u1
|
|
22.04 LTS jammy |
Fixed 2020.81-5ubuntu0.1
|
|
20.04 LTS focal |
Fixed 2019.78-2ubuntu0.1~esm1
|
|
18.04 LTS bionic |
Fixed 2017.75-3ubuntu0.1~esm1
|
|
16.04 LTS xenial |
Vulnerable
|
|
14.04 LTS trusty | Ignored end of standard support |
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Get Ubuntu ProSeverity score breakdown
Parameter | Value |
---|---|
Base score |
|
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 |
References
Related Ubuntu Security Notices (USN)
- USN-7292-1
- Dropbear vulnerabilities
- 25 February 2025