CVE-2021-33627
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk25th percentile - higher than 25% of all known CVEs
Summary
A vulnerability in InsydeH2O Kernel 5.0-5.5 affecting FwBlockServiceSmm. Software SMI services using Communicate() do not validate buffer addresses, allowing use of SMRAM, MMIO, or OS kernel addresses.
Risk Assessment
An attacker could exploit invalid buffer addresses to access critical memory areas, potentially leading to privilege escalation.
Recommendation
Update InsydeH2O to a patched version.
Other vulnerabilities in InsydeH2O
See all- CVE-2022-24031High
An issue was discovered in NvmExpressDxe in InsydeH2O with kernels 5.1 through 5.5. An SMM memory corruption vulnerability allows an attacker to write fixed or predictable data to SMRAM, potentially escalating privileges to SMM.
- CVE-2022-24030High
A vulnerability in AhciBusDxe in InsydeH2O with kernel 5.1-5.5 involves SMM memory corruption, allowing an attacker to write fixed or predictable data to SMRAM, potentially leading to privilege escalation to SMM.
- CVE-2021-43615High
An issue was discovered in HddPassword in InsydeH2O with kernels 5.1 through 5.5. An SMM memory corruption vulnerability allows an attacker to write fixed or predictable data to SMRAM, potentially escalating privileges to SMM.
- CVE-2021-43323High
A vulnerability in UsbCoreDxe in InsydeH2O (kernel 5.5 to 5.0) allows an attacker to hijack execution flow of code running in System Management Mode via an SMM callout. Exploitation could lead to privilege escalation to SMM.
- CVE-2021-42554High
A vulnerability in InsydeH2O with Kernel 5.0-5.5 involves SMM memory corruption in FvbServicesRuntimeDxe, allowing an attacker to write fixed or predictable data to SMRAM, potentially leading to privilege escalation to SMM.
- CVE-2021-42113High
A vulnerability in StorageSecurityCommandDxe in InsydeH2O with Kernel 5.1-5.3 involves an SMM callout that allows an attacker to hijack execution flow of code running in System Management Mode, potentially leading to privilege escalation to SMM.
- CVE-2021-42060High
A vulnerability in InsydeH2O Kernel allows an attacker to hijack execution flow of code running in System Management Mode via an Int15ServiceSmm SMM callout. Exploiting this issue could lead to escalating privileges to SMM.
- CVE-2021-42059Medium
In InsydeH2O Kernel 5.0 through 5.4 before specific versions, a stack-based buffer overflow in the UEFI DisplayTypeDxe DXE driver can lead to arbitrary code execution.
- CVE-2021-41841High
A vulnerability in AhciBusDxe in InsydeH2O with kernel 5.0-5.5 allows an attacker to access System Management Mode and execute arbitrary code, due to inclusion of functionality from an untrusted control sphere.
- CVE-2021-41840High
A vulnerability in NvmExpressDxe in InsydeH2O with kernel 5.0-5.5 allows an attacker to access System Management Mode and execute arbitrary code, due to inclusion of functionality from an untrusted control sphere.
Original NVD description (English source)
An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.09.11, 5.1 before 05.17.11, 5.2 before 05.27.11, 5.3 before 05.36.11, 5.4 before 05.44.11, and 5.5 before 05.52.11 affecting FwBlockServiceSmm. Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid, which allows use of SMRAM, MMIO, or OS kernel addresses.