A tpm2-tools security update has been released for Arch Linux.

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

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?id64427
  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