CVE-2022-32478 : Security Advisory and Response
Learn about CVE-2022-32478, a security vulnerability in Insyde InsydeH2O firmware with kernel 5.0 through 5.5 that could lead to privilege escalation and SMRAM corruption. Find out how to mitigate and prevent exploitation.
A security vulnerability has been identified in Insyde InsydeH2O firmware with kernel versions 5.0 through 5.5. This vulnerability could allow attackers to exploit DMA attacks on the IdeBusDxe shared buffer, potentially leading to corruption of SMRAM and privilege escalation.
Understanding CVE-2022-32478
What is CVE-2022-32478?
Insyde InsydeH2O with kernel versions 5.0 through 5.5 is susceptible to TOCTOU race-condition issues due to DMA attacks on the IdeBusDxe shared buffer. Attackers could exploit this vulnerability to corrupt SMRAM and elevate their privileges.
The Impact of CVE-2022-32478
If successfully exploited, this vulnerability could allow unauthorized access to sensitive system resources and potentially lead to a compromise of the affected device's security.
Technical Details of CVE-2022-32478
Vulnerability Description
The vulnerability arises from DMA attacks on the IdeBusDxe shared buffer, creating a TOCTOU race-condition issue that could result in SMRAM corruption and privilege escalation.
Affected Systems and Versions
Insyde InsydeH2O firmware with kernel versions 5.0 through 5.5 is affected by this vulnerability.
Exploitation Mechanism
Attackers could exploit this vulnerability by manipulating the shared buffer to corrupt SMRAM and gain elevated privileges on the system.
Mitigation and Prevention
Immediate Steps to Take
To mitigate the risk associated with CVE-2022-32478, it is recommended to enable IOMMU protection for the ACPI runtime memory used by the command buffer. Additionally, copying the firmware block services data to SMRAM before validation can help prevent exploitation.
Long-Term Security Practices
Regularly updating the system firmware and implementing security best practices can enhance the overall security posture and help prevent similar vulnerabilities in the future.
Patching and Updates
Stay informed about security advisories from the vendor and apply relevant patches and updates promptly to address any known vulnerabilities.