ASUS UX360CA BIOS up to 303 SMM Local Privilege Escalation

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CVSS Meta Temp Score
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6.3$0-$5k0.21

A vulnerability has been found in ASUS UX360CA BIOS up to 303 and classified as critical. Affected by this vulnerability is an unknown code of the component SMM. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The UX360CA BIOS through 303 on ASUS laptops allow an attacker (with the ring 0 privilege) to overwrite nearly arbitrary physical memory locations, including SMRAM, and execute arbitrary code in the SMM (issue 3 of 3).

The weakness was disclosed 04/01/2021. The advisory is shared at asus.com. This vulnerability is known as CVE-2021-26943 since 02/09/2021. The exploitation appears to be easy. An attack has to be approached locally. A single authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

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VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.6
VulDB Temp Score: 6.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
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VulDB Reliability: 🔍

Exploitinginfoedit

Class: Unknown
CWE: Unknown
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Recommended: no mitigation known
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Timelineinfoedit

02/09/2021 CVE assigned
04/01/2021 +50 days Advisory disclosed
04/01/2021 +0 days VulDB entry created
04/07/2021 +6 days VulDB last update

Sourcesinfoedit

Vendor: https://www.asus.com/

Advisory: asus.com
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2021-26943 (🔒)

Entryinfoedit

Created: 04/01/2021 08:02 AM
Updated: 04/07/2021 03:28 PM
Changes: (3) source_cve_assigned source_cve_nvd_summary advisory_confirm_url
Complete: 🔍

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