CVE-2021-3505

NameCVE-2021-3505
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libtpms (PTS)bookworm, sid0.9.2-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libtpmssource(unstable)0.8.0~dev1-1

Notes

https://github.com/stefanberger/libtpms/issues/183
https://github.com/stefanberger/libtpms/commit/625171be0c8225824740b5d0fb7e8562f6a1c6a8 (v0.8.0)
https://github.com/stefanberger/libtpms/commit/c1f7bf55099fcd427715aa65e130475c6e836a6b (v0.8.0)

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