National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2019-11230 Detail

Current Description

In Avast Antivirus before 19.4, a local administrator can trick the product into renaming arbitrary files by replacing the Logs\Update.log file with a symlink. The next time the product attempts to write to the log file, the target of the symlink is renamed. This defect can be exploited to rename a critical product file (e.g., AvastSvc.exe), causing the product to fail to start on the next system restart.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 4.4 MEDIUM
Vector: AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N (V3.0 legend)
Impact Score: 3.6
Exploitability Score: 0.8


Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): High
Availability (A): None

CVSS v2.0 Severity and Metrics:

Base Score: 3.6 LOW
Vector: (AV:L/AC:L/Au:N/C:N/I:P/A:P) (V2 legend)
Impact Subscore: 4.9
Exploitability Subscore: 3.9


Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): Partial
Availability (A): Partial
Additional Information:
Allows unauthorized modification
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.mcerlane.co.uk/CVE-2019-11230/ Exploit Third Party Advisory
http://www.securityfocus.com/bid/109344 Third Party Advisory

Technical Details

Vulnerability Type (View All)

  • Improper Link Resolution Before File Access ('Link Following') (CWE-59)

Known Affected Software Configurations Switch to CPE 2.3

Configuration 1 ( hide )
 cpe:/a:avast:antivirus
     Show Matching CPE(s)
Up to (excluding)
19.4


Change History

2 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-11230
NVD Published Date:
07/18/2019
NVD Last Modified:
07/24/2019