Insyde's Security Pledge
Insyde Security Advisory 2022019
| Insyde ID | Advisory Category | Impact of Vulnerability | Severity Rating | Original Date | Last Revised |
| INSYDE-SA-2022019 | Software | AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | 8.2 | 02/01/2022 | 02/01/2022 |
Summary:
A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated table variables EFI_BOOT_SERVICES and EFI_RUNTIME_SERVICES. This can be used by an attacker to overwrite address location of the function (LocateHandleBuffer) to the address location of arbitrary code controlled by the attacker. On system call to SWSMI handler, the arbitrary code can be triggered to execute.
Vulnerability Details
This corresponds to CVE-2021-41841. It affects the driver AhciBusDxe. This issue was discovered by a 3rd party security researcher and entered as a security incident on May 26, 2021. It was independently reported by Binarly (BRLY-2021-018) in September 2021. It was fixed in the following Insyde kernel versions on July 26, 2021. Kernel 5.0: 05.08.29 Kernel 5.1: 05.16.29 Kernel 5.2: 05.26.29 Kernel 5.3: 05.35.29 Kernel 5.4: 05.43.29 Kernel 5.5: 05.51.29
Acknowledgements:
Insyde Software would like to thank Binarly for reporting this issue.
Revision History:
| Revision | Date | Description |
| 1.0 | 02/01/2022 | Initial Release |
| - | - | - |