Memory Manipulation Vulnerability in ASUS Laptop BIOS
CVE-2021-26943

8.2HIGH

Key Information:

Vendor

Asus
Status
Ux360ca Bios
Vendor
CVE Published:
31 March 2021

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-26943?

The UX360CA BIOS on ASUS laptops versions up to 303 is susceptible to a severe flaw that enables an attacker with ring 0 privileges to overwrite almost any physical memory location, including System Management RAM (SMRAM). This exploitation facilitates the execution of arbitrary code within the System Management Mode (SMM), potentially allowing malicious activities that compromise the integrity and security of the system.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

SmmExploit
Created by tandasat

References

https://www.asus.com/support/FAQ/1045541/
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https://www.youtube.com/watch?v=1H3AfaVyeuk
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EPSS Score

5% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

JSON
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CVE-2021-26943 : Memory Manipulation Vulnerability in ASUS Laptop BIOS