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Vulnerability · Published Jan 19, 2023 · Assigned by GitHub_M

CVE-2023-22745Buffer Overlow in TSS2_RC_Decode in tpm2-tss

Medium 6.4

In plain English

A medium-severity buffer overflow in tpm2-tss from tpm2-software. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.5%top 54.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8tpm2-tss2.3.2-5.el8ALSA-2023:7166
AlmaLinux:9tpm2-tss3.2.2-2.el9ALSA-2023:6685
AlmaLinux:8tpm2-tss-devel2.3.2-5.el8ALSA-2023:7166
AlmaLinux:9tpm2-tss-devel3.2.2-2.el9ALSA-2023:6685
Debian:12tpm2-tss3.2.1-3DEBIAN-CVE-2023-22745
Debian:13tpm2-tss3.2.1-3DEBIAN-CVE-2023-22745
Debian:14tpm2-tss3.2.1-3DEBIAN-CVE-2023-22745
Ubuntu:22.04:LTStpm2-tss3.2.0-1ubuntu1.1UBUNTU-CVE-2023-22745
Ubuntu:22.04:LTStpm2-tss3.2.0-1ubuntu1.1USN-6796-1
Ubuntu:24.04:LTStpm2-tss4.0.1-7.1ubuntu5.1USN-6796-1

Affected products (as reported)

VendorProductVersions
tpm2-software tpm2-tss < 4.0.1< 3.2.2-rc0

Weakness: CWE-120 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

References