NLOKVULNRICHMENT:CVE-2024-5102CVE-2024-5102 Elevation of Privelage via symlinked file in Avast Antivirus
CVSS4
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
ACTIVE
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:H/SC:H/VI:H/SI:H/VA:H/SA:H
AI Score
Confidence
High
EPSS
Percentile
9.0%
SSVC
Exploitation
none
Automatable
no
Technical Impact
partial
A sym-linked file accessed via the repair function in Avast Antivirus <24.2 on Windows may allow user to elevate privilege to delete arbitrary files or run processes as NT AUTHORITY\SYSTEM. The vulnerability exists within the “Repair” (settings -> troubleshooting -> repair) feature, which attempts to delete a file in the current user’s AppData directory as NT AUTHORITY\SYSTEM. A low-privileged user can make a pseudo-symlink and a junction folder and point to a file on the system. This can provide a low-privileged user an Elevation of Privilege to win a race-condition which will re-create the system files and make Windows callback to a specially-crafted file which could be used to launch a privileged shell instance.
This issue affects Avast Antivirus prior to 24.2.
CNA Affected
[
{
"vendor": "Avast",
"product": "Antivirus",
"versions": [
{
"status": "affected",
"version": "24.2",
"versionType": "custom"
}
],
"platforms": [
"Windows"
],
"defaultStatus": "unaffected"
}
]Related
CVSS4
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
ACTIVE
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:H/SC:H/VI:H/SI:H/VA:H/SA:H
AI Score
Confidence
High
EPSS
Percentile
9.0%
SSVC
Exploitation
none
Automatable
no
Technical Impact
partial