Bug 1998588 (CVE-2021-3746) - CVE-2021-3746 libtpms: out-of-bounds access via specially crafted TPM 2 command packets
Summary: CVE-2021-3746 libtpms: out-of-bounds access via specially crafted TPM 2 comma...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-3746
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1998589 1998590 1999303 1999305 1999306 1999307
Blocks: 1997740 1998591
TreeView+ depends on / blocked
 
Reported: 2021-08-27 17:01 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-04-17 21:34 UTC (History)
4 users (show)

Fixed In Version: libtpms 0.8.5, libtpms 0.7.9, libtpms 0.6.6 and later
Clone Of:
Environment:
Last Closed: 2021-08-31 13:22:12 UTC
Embargoed:

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Description Guilherme de Almeida Suckevicz 2021-08-27 17:01:53 UTC 
A bug was discovered in the libtpms code that may cause access beyond the boundary of internal buffers. The vulnerability can be triggered by specially-crafted TPM 2 command packets that then trigger the issue when the state of the TPM 2's volatile state is marshalled/written.

Reference and upstream patches:
https://github.com/stefanberger/libtpms/commit/1fb6cd9b8df05b5d6e381b31215193d6ada969df
https://github.com/stefanberger/libtpms/commit/ea62fd9679f8c6fc5e79471b33cfbd8227bfed72
Comment 1 Guilherme de Almeida Suckevicz 2021-08-27 17:02:15 UTC 
Created libtpms tracking bugs for this issue:

Affects: epel-8 [bug 1998590]
Affects: fedora-all [bug 1998589]
Comment 7 devthomp 2021-08-31 13:22:12 UTC 
analysis complete, patches provided and trackers filed.
resolving.
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