tpm2-tss: CVE-2023-22745

Debian Bug report logs - #1029369
tpm2-tss: CVE-2023-22745

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: tpm2-tss: CVE-2023-22745

Date: Sat, 21 Jan 2023 22:30:01 +0100

Source: tpm2-tss
Version: 3.2.1-2
Severity: normal
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for tpm2-tss.

CVE-2023-22745[0]:
| tpm2-tss is an open source software implementation of the Trusted
| Computing Group (TCG) Trusted Platform Module (TPM) 2 Software Stack
| (TSS2). In affected versions `Tss2_RC_SetHandler` and `Tss2_RC_Decode`
| both index into `layer_handler` with an 8 bit layer number, but the
| array only has `TPM2_ERROR_TSS2_RC_LAYER_COUNT` entries, so trying to
| add a handler for higher-numbered layers or decode a response code
| with such a layer number reads/writes past the end of the buffer. This
| Buffer overrun, could result in arbitrary code execution. An example
| attack would be a MiTM bus attack that returns 0xFFFFFFFF for the RC.
| Given the common use case of TPM modules an attacker must have local
| access to the target machine with local system privileges which allows
| access to the TPM system. Usually TPM access requires administrative
| privilege.

Given the context, usually TPM accessing already implying
administrative privilege, I guess we can consider the security impact
negligible or at least minor. Filling the bug mainly for tracking
downstream the issue.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2023-22745
    https://www.cve.org/CVERecord?id=CVE-2023-22745
[1] https://github.com/tpm2-software/tpm2-tss/commit/306490c8d848c367faa2d9df81f5e69dab46ffb5
[2] https://github.com/tpm2-software/tpm2-tss/security/advisories/GHSA-4j3v-fh43-vx67

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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