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: 2021-10-18 12:48 UTC (History)
4 users (show)

Fixed In Version: libtpms 0.8.5, libtpms 0.7.9, libtpms 0.6.6 and later
Doc Type: If docs needed, set a value
Doc Text:
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.
Clone Of:
Environment:
Last Closed: 2021-08-31 13:22:12 UTC


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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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