SNS Escalation of privilege in Intel VT-d (CVE-2020-24489)

Advisory ID CVE Number Date discovered Severity Advisory revision
STORM-2021-043 CVE-2020-24489 06/30/2021 high v1

Vulnerability details

Virtualization Technology for Directed I/0 (VT-d) vulnerability may allow an authenticated user to potentially enable escalation of privileges.

Impacted products

Stormshield Network Security high SNS is impacted


Version Date Description
v1  02/09/2022 Reserved publication
v2 23/03/2023 Public publication


Stormshield Network Security

CVSS v3.1 Overall Score: 7.7      


Impacted version

This vulnerability could allow an attacker with a local access (ability to run on SNS his own code or script) to potentially enable escalation of privileges. This vulnerability is useless for an attacker who already have administrator access because an administrator is the highest privileges on the appliance.
As this vulnerability can only be exploited locally, it can not provide an external attacker access to an SNS appliance.

Only the SNi20 model is impacted.


  • SNS 4.0.0 to 4.1.6
  • SNS 4.2.0 to 4.2.3
  • SNS 4.3.0

Only the SNi20 model is impacted.

Workaround solution


In order to mitigate the risk of exploitation keep your appliance updated.

As stated in the analysis, this vulnerability can only be exploited locally. On SNS, local access are only granted to user with the highest privileges. Therefore an exploitation of this vulnerability is useless to a SNS local user.

Nevertheless, a fix for this vulnerability has been delivered in the version 4.4.0.

Attack Vector Attack Complexity Privileges Required User Interaction Scope Confidentiality Impact Integrity Impact Availability impact
Local Low Low None Changed High High High
CVSS Base score: 8.8 CVSS Vector: (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
Exploit Code Maturity Remediation Level Report Confidence
Unproven that exploit exists Official fix Confirmed
CVSS Temporal score: 7.7 CVSS Vector: (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C)
Confidentiality Requirement Integrity Requirement Availability Requirement
High High High
CVSS Environmental score: 7.7 CVSS Vector: (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C/CR:H/IR:H/AR:H/MAV:X/MAC:X/MPR:X/MUI:X/MS:X/MC:X/MI:X/MA:X)