Vulnerability CVE-2020-24455

Vulnerability Name:

CVE-2020-24455 (CCN-197478)

Assigned:

2020-11-27

Published:

2020-11-27

Updated:

2022-07-30

Summary:

Missing initialization of a variable in the TPM2 source may allow a privileged user to potentially enable an escalation of privilege via local access. This affects tpm2-tss before 3.0.1 and before 2.4.3.

CVSS v3 Severity:

6.7 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
5.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): High User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

4.2 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L)
3.7 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/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): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): Low Integrity (I): Low Availibility (A): Low

CVSS v2 Severity:

4.6 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

4.3 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

Vulnerability Type:

CWE-909

Vulnerability Consequences:

Gain Privileges

References:

Source: MITRE
Type: CNA
CVE-2020-24455

Source: CCN
Type: Red Hat Bugzilla Bug 1902167
(CVE-2020-24455) - CVE-2020-24455 tpm2-tss: FAPI PolicyPCR not instatiating correctly

Source: CONFIRM
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1902167

Source: XF
Type: UNKNOWN
tpm2-cve202024455-priv-esc(197478)

Source: CCN
Type: TPM2 GIT Repository
tpm2-tss

Source: CONFIRM
Type: Release Notes, Third Party Advisory
https://github.com/tpm2-software/tpm2-tss/releases/tag/2.4.3

Source: CONFIRM
Type: Release Notes, Third Party Advisory
https://github.com/tpm2-software/tpm2-tss/releases/tag/3.0.1

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-fa78f3ca9f

Source: GENTOO
Type: Third Party Advisory
GLSA-202107-10

Source: CCN
Type: TPM2 Web site
TPM2

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2020-24455

Vulnerable Configuration:

Configuration 1:

cpe:/a:tpm2_software_stack_project:tpm2_software_stack:*:*:*:*:*:*:*:* (Version < 2.4.3)

OR cpe:/a:tpm2_software_stack_project:tpm2_software_stack:*:*:*:*:*:*:*:* (Version >= 3.0.0 and < 3.0.1)

Configuration 2:

cpe:/o:fedoraproject:fedora:34:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:7685	P	libtss2-esys0-3.1.0-150400.3.3.1 on GA media (Moderate)	2023-06-12
oval:org.opensuse.security:def:3093	P	gstreamer-plugins-bad-1.8.3-17.2 on GA media (Moderate)	2022-06-28
oval:org.opensuse.security:def:94723	P	libtss2-esys0-3.1.0-150400.1.6 on GA media (Moderate)	2022-06-22
oval:org.opensuse.security:def:214	P	libtss2-esys0-2.4.5-1.11 on GA media (Moderate)	2022-06-13
oval:org.opensuse.security:def:112881	P	libtss2-esys0-3.1.0-1.2 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:1143	P	Security update for ImageMagick (Moderate)	2021-12-10
oval:org.opensuse.security:def:106341	P	libtss2-esys0-3.1.0-1.2 on GA media (Moderate)	2021-10-01
oval:org.opensuse.security:def:62232	P	libtss2-esys0-2.4.5-1.11 on GA media (Moderate)	2021-08-09
oval:org.opensuse.security:def:71973	P	libtss2-esys0-2.4.5-1.11 on GA media (Moderate)	2021-08-09

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