CVE-2021-3505: 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…

PriorityP424medium5.5CVSS 3.1

AVLACLPRLUINSUCHINAN

EPSS

0.40%

32.7th percentile

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.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
debian	libtpms	< libtpms 0.8.0~dev1-1 (bookworm)	libtpms 0.8.0~dev1-1 (bookworm)
fedoraproject	fedora	—	—
libtpms_project	libtpms	< 0.8.0	0.8.0
libtpms_project	libtpms	—	—
libtpms_project	libtpms	>= 0 < 0.8.0~dev1-1	0.8.0~dev1-1
libtpms_project	libtpms	>= 0 < 0.8.0~dev1-1	0.8.0~dev1-1
libtpms_project	libtpms	>= 0 < 0.8.0~dev1-1	0.8.0~dev1-1
redhat	enterprise_linux	—	—

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

nvdv2.02.1LOWAV:L/AC:L/Au:N/C:P/I:N/A:N

osv5.5MEDIUM

vendor_debian5.5MEDIUM

vendor_redhat5.5MEDIUM

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