Vulnerability Name:

CVE-2021-26943 (CCN-199220)

Assigned:2020-12-31
Published:2020-12-31
Updated:2021-04-07
Summary: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).
CVSS v3 Severity:8.2 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)
7.1 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.8 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.2 High (CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
6.8 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-26943

Source: XF
Type: UNKNOWN
asus-ux360ca-cve202126943-code-exec(199220)

Source: CCN
Type: ASUS Web site
[UX360CA / Notebook] BIOS Security Update

Source: CONFIRM
Type: Exploit, Vendor Advisory
https://www.asus.com/support/FAQ/1045541/

Source: CCN
Type: YouTube Web site
ASUS UX360CA

Source: MISC
Type: Exploit, Third Party Advisory
https://www.youtube.com/watch?v=1H3AfaVyeuk

Vulnerable Configuration:Configuration 1:
  • cpe:/o:asus:ux360ca_bios:*:*:*:*:*:*:*:* (Version < 304)
  • AND
  • cpe:/h:asus:ux360ca:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    asus ux360ca bios *
    asus ux360ca -