Advantech WebAccess/VPN < 1.1.5 Path Traversal via AjaxStandaloneVpnClientsController

Advisories

severity: medium
date: November 6, 2025
Affecting: WebAccess/VPN < 1.1.5
CVE: CVE-2025-34238
CWE: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References: Advantech Advisory
Credit: Alex Williams from Pellera Technologies
Description: Advantech WebAccess/VPN versions prior to 1.1.5 contain an absolute path traversal via AjaxStandaloneVpnClientsController.ajaxDownloadRoadWarriorConfigFileAction() that allows an authenticated network administrator to cause the application to read and return the contents of arbitrary files the web user (www-data) can access.