QID 375659

Date Published: 2021-06-28

QID 375659: Dell Client Platform BIOSConnect and HTTPS Boot Multiple Vulnerabilities (DSA-2021-106)

The Dell BIOSConnect feature is a Dell preboot solution that is used to update system BIOS and recover the operating system (OS) using the SupportAssist OS Recovery on Dell Client platforms.
The Dell HTTPS Boot feature is an extension to UEFI HTTP Boot specifications to boot from an HTTP(S) Server.

Dell UEFI BIOS https stack leveraged by the Dell BIOSConnect feature and Dell HTTPS Boot feature contains an improper certificate validation vulnerability. A remote unauthenticated attacker may exploit this vulnerability using a person-in-the-middle attack which may lead to a denial of service and payload tampering.
Dell BIOSConnect feature contains a buffer overflow vulnerability. An authenticated malicious admin user with local access to the system may potentially exploit this vulnerability to run arbitrary code and bypass UEFI restrictions.

Successful exploitation allows attacker to execute arbitratry code.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as High - 6.9 severity.
    • Solution
    Customers are advised to update the BIOS to latest version. Refer to DSA-2021-106 for more information.Workaround:
    Customers may disable the BIOSConnect feature.
    Customers may disable the HTTPS Boot feature.
    Vendor References

    CVEs related to QID 375659

    CVE-2021-21571 | CVE-2021-21572 | CVE-2021-21573 | CVE-2021-21574 |
    Software Advisories
    Advisory ID Software Component Link
    DSA-2021-106 URL Logo www.dell.com/support/kbdoc/en-us/000188682/dsa-2021-106-dell-client-platform-security-update-for-multiple-vulnerabilities-in-the-supportassist-biosconnect-feature-and-https-boot-feature
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