CVE-2024-5102: A sym-linked file accessed via the repair function in Avast Antivirus troubleshooting -> repair) feature, which attempts to delete a file in the current user's…

PriorityP434high7CVSS 3.1

AVLACHPRLUINSUCHIHAH

EPSS

0.22%

13.1th percentile

A sym-linked file accessed via the repair function in Avast Antivirus 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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
avast	antivirus	< 24.2	24.2
avast	antivirus	—	—

CVSS provenance

nvdv3.17.0HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

nvdv4.07.3HIGHCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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