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CVE-2021-3746

Published: 19 October 2021

A flaw was found in the libtpms code that may cause access beyond the boundary of internal buffers. The vulnerability is triggered by specially-crafted TPM2 command packets that then trigger the issue when the state of the TPM2's volatile state is written. The highest threat from this vulnerability is to system availability. This issue affects libtpms versions before 0.8.5, before 0.7.9 and before 0.6.6.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
libtpms
Launchpad, Ubuntu, Debian
trusty Ignored
(end of standard support)
xenial Ignored
(end of standard support)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
upstream
Released (0.9.1-1)
jammy Not vulnerable
(0.9.3-0ubuntu1)
Patches:
upstream: https://github.com/stefanberger/libtpms/commit/1fb6cd9b8df05b5d6e381b31215193d6ada969df (v0.6.6)
upstream: https://github.com/stefanberger/libtpms/commit/ea62fd9679f8c6fc5e79471b33cfbd8227bfed72 (v0.6.6)

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H