CVE-2023-22745
Assigner: GitHub_M
Published: 2023-01-19T22:12:40.208Z
State: PUBLISHED
title: Buffer Overlow in TSS2_RC_Decode in tpm2-tss
problemTypes: descriptions: cweId: CWE-120
description: CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
type: CWE
metrics: cvssV3_1: attackComplexity: HIGH
attackVector: LOCAL
availabilityImpact: HIGH
baseScore: 6.4
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: HIGH
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
version: 3.1
affected: vendor: tpm2-software
product: tpm2-tss
versions: version: <= 4.0.0
status: affected
descriptions: value: 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. 
source: advisory: GHSA-4j3v-fh23-vx67
discovery: UNKNOWN