CVE-2021-3505

Public Exploit

Description

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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.13%
Vendor Advisory fedoraproject.org
Affected: n/a libtpms
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1950046 issue tracking third party advisory patch
https://github.com/stefanberger/libtpms/issues/183 exploit third party advisory patch
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUCZX4S53TUNTSGTCRDNOQZV2V2RI4RJ/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-3505?
CVE-2021-3505 has been scored as a medium severity vulnerability.
How to fix CVE-2021-3505?
To fix CVE-2021-3505, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-3505 being actively exploited in the wild?
It is possible that CVE-2021-3505 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-3505?
CVE-2021-3505 affects n/a libtpms.
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