title: Time-of-check to time-of-use (TOCTOU) bug  leads to full local privilege escalation.
description: A time-of-check to time-of-use (TOCTOU) bug in handling of IOCTL (input/output control) requests. This TOCTOU bug leads to an out-of-bounds write vulnerability which can be further exploited, allowing an attacker to gain full local privilege escalation on the system.This issue affects Avast/Avg Antivirus: 23.8.
problem types: CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
affected:
{
defaultStatus: unaffected
platforms: Windows
product: Avast/Avg Antivirus
vendor: Avast/AVG
versions:
status: affected, version:  23.8
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: LOCAL
availabilityImpact: HIGH
baseScore: 8.2
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: LOW
scope: CHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
version: 3.1
]
format: CVSS
scenarios: GENERAL
solutions: We encourage customers to ensure their security software is always updated to the latest version available.