SB2022020308 - Insecure Default Variable Initialization in Insyde SdHostDriver driver
Published: February 3, 2022
Security Bulletin ID
SB2022020308
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Insecure Default Variable Initialization (CVE-ID: CVE-2021-41840)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to the SMM (System Management Mode) branch that registers a SWSMI handler does not sufficiently check or validate the allocated table variable EFI_BOOT_SERVICES. A remote authenticated attacker can overwrite the LocateProtocol or Freepool and execute arbitrary code on the system.
Remediation
Install update from vendor's website.