Vulnerability Name:

CVE-2020-10867 (CCN-178950)

Assigned:2020-04-01
Published:2020-04-01
Updated:2020-04-02
Summary:An issue was discovered in Avast Antivirus before 20. The aswTask RPC endpoint for the TaskEx library in the Avast Service (AvastSvc.exe) allows attackers to bypass intended access restrictions on tasks from an untrusted process, when Self Defense is enabled.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
6.2 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
5.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
4.9 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-668
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-10867

Source: XF
Type: UNKNOWN
avast-cve202010867-sec-bypass(178950)

Source: MISC
Type: Release Notes, Vendor Advisory
https://forum.avast.com/index.php?topic=232420.0

Source: MISC
Type: Release Notes, Vendor Advisory
https://forum.avast.com/index.php?topic=232423.0

Source: CCN
Type: Avast GIT Repository
Multiple Vulnerability Disclosure in Avast AntiVirus (RPC Service)

Source: MISC
Type: Exploit, Third Party Advisory
https://github.com/umarfarook882/Avast_Multiple_Vulnerability_Disclosure/blob/master/README.md

Source: CCN
Type: Avast Web site
Avast Antivirus

Vulnerable Configuration:Configuration 1:
  • cpe:/a:avast:antivirus:*:*:*:*:*:*:*:* (Version < 20.0)
  • AND
  • cpe:/o:microsoft:windows:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    avast antivirus *
    microsoft windows -