SB2020111606 - Multiple vulnerabilities in Intel BIOS Platform Sample Code

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Main Vulnerability Database SB2020111606

SB2020111606 - Multiple vulnerabilities in Intel BIOS Platform Sample Code

Published: November 16, 2020

Security Bulletin ID SB2020111606
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Improper access control (CVE-ID: CVE-2020-8764)

CWE-ID: CWE-284 - Improper Access Control

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


The vulnerability allows a local user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in BIOS firmware. A local administrator can bypass implemented security restrictions, gain unauthorized access to the application and escalate privileges on the target system.


2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-8738)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

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


The vulnerability allows a local administrator to escalate privileges on the system.

The vulnerability exists due to improper conditions check in Intel BIOS platform sample code, which leads to security restrictions bypass and privilege escalation.


3) Out-of-bounds Write (CVE-ID: CVE-2020-8740)

CWE-ID: CWE-787 - Out-of-bounds write

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


The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in Intel BIOS platform sample code. A local administrator can trigger out-of-bounds write and execute arbitrary code on the target system with elevated privileges.


4) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-8739)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

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


The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to usage of potentially dangerous function in Intel BIOS platform sample code, which leads to security restrictions bypass and privilege escalation.


Remediation

Install update from vendor's website.

References