Vulnerability Name:

CVE-2021-45336 (CCN-216146)

Assigned:2021-12-14
Published:2021-12-14
Updated:2022-07-12
Summary:Privilege escalation vulnerability in the Sandbox component of Avast Antivirus prior to 20.4 allows a local sandboxed code to gain elevated privileges by using system IPC interfaces which could lead to exit the sandbox and acquire SYSTEM privileges.
CVSS v3 Severity:8.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
7.7 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/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): Low
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H)
6.2 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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): None
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
6.2 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Gain Privileges
References:Source: MITRE
Type: CNA
CVE-2021-45336

Source: XF
Type: UNKNOWN
avast-cve202145336-priv-esc(216146)

Source: CCN
Type: GitHub Web site
CVE-2021-AVST3 & CVE-2021-AVST4 & CVE-2021-AVST5

Source: MISC
Type: Exploit, Third Party Advisory
https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST3%20%26%20CVE-2021-AVST4%20%26%20CVE-2021-AVST5

Source: CCN
Type: Avast Web site
Avast Antivirus

Source: MISC
Type: Vendor Advisory
https://www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0

Vulnerable Configuration:Configuration 1:
  • cpe:/a:avast:antivirus:*:*:*:*:*:*:*:* (Version < 20.4)

    • Configuration CCN 1:
  • cpe:/a:avast:antivirus:20.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    avast antivirus *
    avast antivirus 20.0