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Fencer Vulns
medium 6.4

CVE-2023-22745 json

Buffer Overlow in TSS2_RC_Decode in tpm2-tss

published 2023-01-19 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-26863

cvss
6.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

tpm2-tss is an open source software implementation of the Trusted Computing Group (TCG) Trusted Platform Module (TPM) 2 Software Stack (TSS2). In versions prior to 4.1.0-rc0, 4.0.1, and 3.2.2-rc1, `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. Versions 4.1.0-rc0, 4.0.1, and 3.2.2-rc1 fix the issue.

Patch / fix

  • tpm2_software_stack_project tpm2_software_stack 3.2.2, 4.1.0
  • tpm2-tss Debian 14, Debian 13, Debian 12 3.2.1-3

debian advisories DEBIAN-CVE-2023-22745

  • tpm2-tss Ubuntu 20.04 LTS 2.3.2-1ubuntu0.20.04.2
  • tpm2-tss Ubuntu 22.04 LTS 3.2.0-1ubuntu1.1

ubuntu advisories UBUNTU-CVE-2023-22745

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tpm2-tss RHEL 8 2.3.2-5.el8
  • tpm2-tss RHEL 9 3.2.2-2.el9
  • tpm2-tss RHEL 8.8 EUS 2.3.2-5.el8_8
  • tpm2-tss RHEL 8.6 TUS, RHEL 8.6 E4S, RHEL 8.6 AUS 2.3.2-5.el8_6

red hat advisories RHSA-2024:4739RHSA-2024:4408RHSA-2023:7166RHSA-2023:6685

  • tpm2-0-tss SLE Real Time 15 SP3, openSUSE Leap 15.4 2.4.5-150300.3.6.1
  • tpm2-0-tss SLE Module for Basesystem 15 SP4, SLE Micro 5.3, openSUSE Leap Micro 5.3 +1 more 3.1.0-150400.3.3.1

suse advisories SUSE-SU-2023:0613-1SUSE-SU-2023:0526-1

  • tpm2-tss AlmaLinux 8 2.3.2-5.el8
  • tpm2-tss AlmaLinux 9 3.2.2-2.el9

almalinux advisories ALSA-2023:7166ALSA-2023:6685

  • tpm2-tss CBL-Mariner 2.0 2.4.6-2
  • tpm2-tss Azure Linux 3.0 4.0.1-1

azure linux advisories AZL-13055AZL-69129

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-22745 updated cvss 6.4

tpm2-tss: Buffer Overlow in TSS2_RC_Decode

  • Red Hat Enterprise Linux 7 tpm2-tss, tpm2-tss-utils
    affected: no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 9) tpm2-tss-devel 3.2.2-2.el9, tpm2-tss-debuginfo 3.2.2-2.el9, tpm2-tss-debugsource 3.2.2-2.el9
    fixed: vendor fix RHSA-2023:6685
  • Red Hat Enterprise Linux BaseOS (v. 8) tpm2-tss 2.3.2-5.el8
    fixed: vendor fix RHSA-2023:7166
  • Red Hat Enterprise Linux BaseOS (v. 9) tpm2-tss 3.2.2-2.el9
    fixed: vendor fix RHSA-2023:6685
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) tpm2-tss 2.3.2-5.el8_6 Red Hat Enterprise Linux BaseOS E4S (v.8.6) tpm2-tss 2.3.2-5.el8_6
    fixed: vendor fix RHSA-2024:4408
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) tpm2-tss 2.3.2-5.el8_8
    fixed: vendor fix RHSA-2024:4739
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) tpm2-tss 2.3.2-5.el8_6
    fixed: vendor fix RHSA-2024:4408

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-046-11 updated cvss 6.4

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
19 mo ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/tpm2-software/tpm2-tss/security/advisories/GHSA-4j3v-fh23-vx67 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.4 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 6.4 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

  • tpm2-software tpm2-tss

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.