PT-2022-9047 · Insyde · Insydeh2O Uefi Firmware

Published 2022-02-03 · Updated 2022-04-12 · CVE-2020-5953

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions InsydeH2O UEFI Firmware (affected versions not specified)

Description A vulnerability exists in the System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware code. The SWSMI handler dereferences the gRT (EFI RUNTIME SERVICES) pointer to call a GetVariable service, which is located outside of SMRAM. This can result in code execution in SMM, escalating privilege from ring 0 to ring -2.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2020-5953

Affected Products

Insydeh2O Uefi Firmware

References · 10

• https://osv.dev/vulnerability/CVE-2020-5953 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-5953 · Security Note
• https://insyde.com/products · Vendor Advisory
• https://insyde.com/security-pledge · Vendor Advisory
• https://t.me/cvenotify/26200 · Telegram Post
• https://security.netapp.com/advisory/ntap-20220222-0005 · Note
• https://kb.cert.org/vuls/id/796611 · Note
• https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf · Note
• https://t.me/cibsecurity/36745 · Telegram Post
• https://t.me/cvenotify/26532 · Telegram Post