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CVE-2021-3505

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Date: April 19, 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.

Language: C

Severity Score

Related Resources (9)

https://nvd.nist.gov/vuln/detail/CVE-2021-3505
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NUCZX4S53TUNTSGTCRDNOQZV2V2RI4RJ/
https://security-tracker.debian.org/tracker/CVE-2021-3505
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUCZX4S53TUNTSGTCRDNOQZV2V2RI4RJ/
https://security.archlinux.org/CVE-2021-3505
https://github.com/stefanberger/libtpms/commit/c1f7bf55099fcd427715aa65e130475c6e836a6b
https://github.com/stefanberger/libtpms/issues/183
https://bugzilla.redhat.com/show_bug.cgi?id=1950046
https://www.mend.io/vulnerability-database/CVE-2021-3505

Severity Score

Weakness Type (CWE)

Insufficient Entropy

CWE-331

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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