SB2022020308 - Insecure Default Variable Initialization in Insyde SdHostDriver driver

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2022020308

SB2022020308 - Insecure Default Variable Initialization in Insyde SdHostDriver driver

Published: February 3, 2022

Security Bulletin ID SB2022020308
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Insecure Default Variable Initialization (CVE-ID: CVE-2021-41840)

CWE-ID: CWE-453 - Insecure Default Variable Initialization

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


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.

References