Vulnerability identifier: #VU54502
Vulnerability risk: Low
CVSSv3.1: 2.2 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-331
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
libtpms
Universal components / Libraries /
Libraries used by multiple products
Vendor: Stefan Berger
Description
The vulnerability allows a local user to decrypt data.
The vulnerability exists in the TPM 2 implementation, which 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.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
libtpms: 0.5.2 - 0.7.8
External links
http://bugzilla.redhat.com/show_bug.cgi?id=1950046
http://github.com/stefanberger/libtpms/issues/183
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NUCZX4S53TUNTSGTCRDNOQZV2V2RI4RJ/
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.