CVE-2021-36368
CVSS V2 Low 2.6
CVSS V3 Low 3.7
Description
** DISPUTED ** An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed."
Overview
- CVE ID
- CVE-2021-36368
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2022-03-13T00:15:07
- Last Modified Date
- 2022-07-01T17:21:11
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* | 1 | OR | 8.9 | |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:H/Au:N/C:P/I:N/A:N
- Access Vector
- NETWORK
- Access Compatibility
- HIGH
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 2.6
- Severity
- LOW
- Exploitability Score
- 4.9
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- HIGH
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- LOW
- Availability Impact
- NONE
- Base Score
- 3.7
- Base Severity
- LOW
- Exploitability Score
- 2.2
- Impact Score
- 1.4
References
| Reference URL | Reference Tags |
|---|---|
| https://github.com/openssh/openssh-portable/pull/258 | Patch Third Party Advisory |
| https://docs.ssh-mitm.at/trivialauth.html | Third Party Advisory |
| https://bugzilla.mindrot.org/show_bug.cgi?id=3316 | Issue Tracking Third Party Advisory |
| https://www.openssh.com/security.html | Vendor Advisory |
| https://security-tracker.debian.org/tracker/CVE-2021-36368 |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-36368 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36368 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 15:43:33 | Added to TrackCVE | |||
| 2022-12-06 12:10:37 | 2022-03-13T00:15Z | 2022-03-13T00:15:07 | CVE Published Date | updated |
| 2022-12-06 12:10:37 | 2022-07-01T17:21:11 | CVE Modified Date | updated | |
| 2022-12-06 12:10:37 | Analyzed | Vulnerability Status | updated |