CVE-2021-3505

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality.

Se encontró un fallo en libtpms en versiones anteriores a 0.8.0. La implementación de TPM 2 devuelve claves de 2048 bits con una intensidad de bits de ~1984 debido a un error en la especificación TCG. El error está en el algoritmo de creación de claves en la función RsaAdjustPrimeCandidate(), que es llamado antes de la comprobación del número primo. La mayor amenaza de esta vulnerabilidad es la confidencialidad de los datos

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-16 CVE Reserved
2021-04-19 CVE Published
2023-11-08 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-331: Insufficient Entropy

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://github.com/stefanberger/libtpms/issues/183	2024-08-03

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1950046	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUCZX4S53TUNTSGTCRDNOQZV2V2RI4RJ	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libtpms Project Search vendor "Libtpms Project"		Libtpms Search vendor "Libtpms Project" for product "Libtpms"				< 0.8.0 Search vendor "Libtpms Project" for product "Libtpms" and version " < 0.8.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		advanced_virtualization		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected