Insecure Default Variable Initialization in Insyde SdHostDriver driver



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-41840
CWE-ID CWE-453
Exploitation vector Network
Public exploit N/A
Vulnerable software
 SdHostDriver
Hardware solutions / Drivers

Vendor Insyde Software

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Insecure Default Variable Initialization

EUVDB-ID: #VU60267

Risk: Medium

CVSSv4.0: 6.3 [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]

CVE-ID: CVE-2021-41840

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

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SdHostDriver: before 5.2: 05.23.35

CPE2.3 External links

https://www.insyde.com/security-pledge


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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