Описание
Libtpms is a library that targets the integration of TPM functionality into hypervisors, primarily into Qemu. Libtpms, which is derived from the TPM 2.0 reference implementation code published by the Trusted Computing Group, is prone to a potential out of bounds (OOB) read vulnerability. The vulnerability occurs in the ‘CryptHmacSign’ function with an inconsistent pairing of the signKey and signScheme parameters, where the signKey is ALG_KEYEDHASH key and inScheme is an ECC or RSA scheme. The reported vulnerability is in the ‘CryptHmacSign’ function, which is defined in the "Part 4: Supporting Routines – Code" document, section "7.151 - /tpm/src/crypt/CryptUtil.c ". This vulnerability can be triggered from user-mode applications by sending malicious commands to a TPM 2.0/vTPM (swtpm) whose firmware is based on an affected TCG reference implementation. The effect on libtpms is that it will cause an abort due to the detection of the out-of-bounds access, thus for example making a vTPM (swtpm) unavailable to a VM. This vulnerability is fixed in 0.7.12, 0.8.10, 0.9.7, and 0.10.1.
A flaw was found in libtpms. A heap buffer overflow can occur in the tpms_parse_pssh function when parsing a malformed Public Signature Key Exchange (PSK) structure. A local attacker can trigger this overflow by providing a crafted PSK structure to the library. This can lead to a denial of service or allow for arbitrary code execution.
Отчет
This vulnerability, identified as a potential out-of-bounds read, is triggered by inconsistent parameters within the CryptHmacSign function of the vTPM (virtual Trusted Platform Module). Although the attack is local to the system, it requires user interaction in the form of sending malicious commands to the vTPM. The primary impact is a denial-of-service (DoS) to the virtual machine (VM) by rendering its vTPM unavailable. This prevents the VM from utilizing critical TPM functionality, which can lead to significant operational disruption. While this flaw does not enable arbitrary code execution, the potential for DoS and broader system instability justifies a Moderate severity rating. The requirement for specific user interaction reduces its severity from what would otherwise be an Important classification.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | libtpms | Affected | ||
| Red Hat Enterprise Linux 8 | virt:rhel/libtpms | Affected | ||
| Red Hat Enterprise Linux 8 Advanced Virtualization | virt:8.2/libtpms | Fix deferred | ||
| Red Hat Enterprise Linux 8 Advanced Virtualization | virt:av/libtpms | Fix deferred | ||
| Red Hat Enterprise Linux 9 | libtpms | Affected |
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Дополнительная информация
Статус:
EPSS
5.9 Medium
CVSS3
Связанные уязвимости
Libtpms is a library that targets the integration of TPM functionality into hypervisors, primarily into Qemu. Libtpms, which is derived from the TPM 2.0 reference implementation code published by the Trusted Computing Group, is prone to a potential out of bounds (OOB) read vulnerability. The vulnerability occurs in the ‘CryptHmacSign’ function with an inconsistent pairing of the signKey and signScheme parameters, where the signKey is ALG_KEYEDHASH key and inScheme is an ECC or RSA scheme. The reported vulnerability is in the ‘CryptHmacSign’ function, which is defined in the "Part 4: Supporting Routines – Code" document, section "7.151 - /tpm/src/crypt/CryptUtil.c ". This vulnerability can be triggered from user-mode applications by sending malicious commands to a TPM 2.0/vTPM (swtpm) whose firmware is based on an affected TCG reference implementation. The effect on libtpms is that it will cause an abort due to the detection of the out-of-bounds access, thus for example mak...
Libtpms is a library that targets the integration of TPM functionality into hypervisors, primarily into Qemu. Libtpms, which is derived from the TPM 2.0 reference implementation code published by the Trusted Computing Group, is prone to a potential out of bounds (OOB) read vulnerability. The vulnerability occurs in the ‘CryptHmacSign’ function with an inconsistent pairing of the signKey and signScheme parameters, where the signKey is ALG_KEYEDHASH key and inScheme is an ECC or RSA scheme. The reported vulnerability is in the ‘CryptHmacSign’ function, which is defined in the "Part 4: Supporting Routines – Code" document, section "7.151 - /tpm/src/crypt/CryptUtil.c ". This vulnerability can be triggered from user-mode applications by sending malicious commands to a TPM 2.0/vTPM (swtpm) whose firmware is based on an affected TCG reference implementation. The effect on libtpms is that it will cause an abort due to the detection of the out-of-bounds access, thus for example making
Libtpms is a library that targets the integration of TPM functionality ...
EPSS
5.9 Medium
CVSS3