Vulnerability Monitor

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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 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.

Published

2021-04-19T21:15:13.270

Last Modified

2024-11-21T06:21:42.280

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.5 (MEDIUM)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:P/I:N/A:N

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

3.9

Impact Score

2.9

Weaknesses

Type: Primary
CWE-331

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	libtpms_project	libtpms	< 0.8.0	Yes
Operating System	redhat	enterprise_linux	8.0	Yes
Operating System	fedoraproject	fedora	33	Yes

References

https://bugzilla.redhat.com/show_bug.cgi?id=1950046 Issue Tracking, Patch, Third Party Advisory ([email protected])
https://github.com/stefanberger/libtpms/issues/183 Exploit, Patch, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUCZX4S53TUNTSGTCRDNOQZV2V2RI4RJ/ ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=1950046 Issue Tracking, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/stefanberger/libtpms/issues/183 Exploit, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUCZX4S53TUNTSGTCRDNOQZV2V2RI4RJ/ (af854a3a-2127-422b-91ae-364da2661108)