CVE-2021-3505

Published: 19 April 2021

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.

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
libtpms Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	groovy	Not vulnerable (0.8.0~dev1-1.1)
	trusty	Does not exist
	upstream	Released (0.8.0~dev1-1)
	xenial	Does not exist

Severity score breakdown

Parameter	Value
Base score	5.5
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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