CVE-2021-3505
Publication date 19 April 2021
Last updated 24 July 2024
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libtpms | ||
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
5.5 · Medium
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
References
Other references
- 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)
- https://bugzilla.redhat.com/show_bug.cgi?id=1950046
- https://www.cve.org/CVERecord?id=CVE-2021-3505