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