Vulnerability Name:

CVE-2021-43399 (CCN-214775)

Assigned:2021-12-08
Published:2021-12-08
Updated:2022-04-04
Summary:The Yubico YubiHSM YubiHSM2 library 2021.08, included in the yubihsm-shell project, does not properly validate the length of some operations including SSH signing requests, and some data operations received from a YubiHSM 2 device.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
4.0 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L)
3.5 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): Low
CVSS v2 Severity:7.8 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
4.0 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:M/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Multiple_Instances
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
Vulnerability Type:CWE-787
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-43399

Source: MISC
Type: Exploit, Third Party Advisory
https://blog.inhq.net/posts/yubico-yubihsm-shell-vuln3/

Source: XF
Type: UNKNOWN
yubico-cve202143399-dos(214775)

Source: CCN
Type: Yubico Security Advisory YSA-2021-04
Input validation issues in libyubihsm

Source: MISC
Type: Vendor Advisory
https://www.yubico.com/support/security-advisories/ysa-2021-04/

Vulnerable Configuration:Configuration 1:
  • cpe:/a:yubico:yubihsm_2_software_development_kit:*:*:*:*:*:*:*:* (Version <= 2021.08)

    • * Denotes that component is vulnerable
    BACK
    yubico yubihsm 2 software development kit *