CVE-2021-31924
CVSS V2 Medium 4.6
CVSS V3 Medium 6.8
Description
Yubico pam-u2f before 1.1.1 has a logic issue that, depending on the pam-u2f configuration and the application used, could lead to a local PIN bypass. This issue does not allow user presence (touch) or cryptographic signature verification to be bypassed, so an attacker would still need to physically possess and interact with the YubiKey or another enrolled authenticator. If pam-u2f is configured to require PIN authentication, and the application using pam-u2f allows the user to submit NULL as the PIN, pam-u2f will attempt to perform a FIDO2 authentication without PIN. If this authentication is successful, the PIN requirement is bypassed.
Overview
- CVE ID
- CVE-2021-31924
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2021-05-26T00:15:08
- Last Modified Date
- 2022-12-09T18:17:30
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:yubico:pam-u2f:*:*:*:*:*:*:*:* | 1 | OR | 1.1.1 | |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:L/AC:L/Au:N/C:P/I:P/A:P
- Access Vector
- LOCAL
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- PARTIAL
- Availability Impact
- PARTIAL
- Base Score
- 4.6
- Severity
- MEDIUM
- Exploitability Score
- 3.9
- Impact Score
- 6.4
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack Vector
- PHYSICAL
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- HIGH
- Base Score
- 6.8
- Base Severity
- MEDIUM
- Exploitability Score
- 0.9
- Impact Score
- 5.9
References
| Reference URL | Reference Tags |
|---|---|
| https://developers.yubico.com/pam-u2f/ | Product Vendor Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CRBVOZEMVO72FV4Z5O4GBGSURXHWRGD3/ | Mailing List Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IL3I5AKECLMK4ADLLACLOEF7H5CMNDP2/ | Mailing List Third Party Advisory |
| https://security.gentoo.org/glsa/202208-11 | |
| https://www.yubico.com/support/security-advisories/ysa-2021-03 | Vendor Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-31924 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31924 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:29:32 | Added to TrackCVE | |||
| 2022-12-05 02:59:11 | 2021-05-26T00:15Z | 2021-05-26T00:15:08 | CVE Published Date | updated |
| 2022-12-05 02:59:11 | 2022-08-10T20:15:20 | CVE Modified Date | updated | |
| 2022-12-05 02:59:11 | Undergoing Analysis | Vulnerability Status | updated | |
| 2022-12-05 02:59:16 | References | updated | ||
| 2022-12-09 19:13:34 | 2022-12-09T18:17:30 | CVE Modified Date | updated | |
| 2022-12-09 19:13:34 | Undergoing Analysis | Analyzed | Vulnerability Status | updated |