[ASA-202106-55] tpm2-tools: man-in-the-middle

[Jonas Witschel]

Arch Linux Security Advisory ASA-202106-55
==========================================

Severity: Low
Date    : 2021-06-22
CVE-ID  : CVE-2021-3565
Package : tpm2-tools
Type    : man-in-the-middle
Remote  : No
Link    : https://security.archlinux.org/AVG-1986

Summary
=======

The package tpm2-tools before version 5.1.1-1 is vulnerable to man-in-
the-middle.

Resolution
==========

Upgrade to 5.1.1-1.

# pacman -Syu "tpm2-tools>=5.1.1-1"

The problem has been fixed upstream in version 5.1.1.

Workaround
==========

None.

Description
===========

A security issue was found in tpm2-tools before version 5.1.1.
tpm2_import used a fixed AES key for the inner wrapper, potentially
allowing a man-in-the-middle (MITM) attacker to unwrap the inner
portion and reveal the key being imported.

Impact
======

A local attacker could disclose the secret portion of a key while it is
being imported into the TPM.

References
==========

https://bugzilla.redhat.com/show_bug.cgi?id=1964427
https://github.com/tpm2-software/tpm2-tools/issues/2738
https://github.com/tpm2-software/tpm2-tools/pull/2739
https://github.com/tpm2-software/tpm2-tools/commit/47b3b6e6fffed7080a2f1ce7673207ea44823ef7
https://security.archlinux.org/CVE-2021-3565
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