Vulnerability Name:

CVE-2021-38576 (CCN-216705)

Assigned:2021-08-11
Published:2021-08-11
Updated:2022-01-13
Summary:A BIOS bug in firmware for a particular PC model leaves the Platform authorization value empty. This can be used to permanently brick the TPM in multiple ways, as well as to non-permanently DoS the system.
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)
6.6 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:U/RC:R)
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
6.2 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Local
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
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
4.9 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-38576

Source: CCN
Type: TianoCore Bugzilla - Bug 3499
edk2

Source: MISC
Type: Issue Tracking, Permissions Required, Third Party Advisory
https://bugzilla.tianocore.org/show_bug.cgi?id=3499

Source: XF
Type: UNKNOWN
tianocore-cve202138576-dos(216705)

Source: CCN
Type: TianoCore Web site
TianoCore EDK II

Vulnerable Configuration:Configuration 1:
  • cpe:/a:tianocore:edk2:201808:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:201811:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:201903:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:201905:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:201908:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:201911:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:202002:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:202005:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:202008:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:202011:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:202102:*:*:*:*:*:*:*
  • OR cpe:/a:tianocore:edk2:202105:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:tianocore:edk_ii:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    tianocore edk2 201808
    tianocore edk2 201811
    tianocore edk2 201903
    tianocore edk2 201905
    tianocore edk2 201908
    tianocore edk2 201911
    tianocore edk2 202002
    tianocore edk2 202005
    tianocore edk2 202008
    tianocore edk2 202011
    tianocore edk2 202102
    tianocore edk2 202105
    tianocore edk ii -