#VU37761 Path traversal in vBulletin - CVE-2017-17671
Published: December 14, 2017 / Updated: August 8, 2020
Vulnerability identifier: #VU37761
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2017-17671
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
vBulletin
vBulletin
Software vendor:
vBulletin
vBulletin
Description
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call is reachable with an unauthenticated request that can include directory traversal sequences to specify an arbitrary pathname, and because ../ traversal is blocked but .. traversal is not blocked. For example, an attacker can make an invalid HTTP request containing PHP code, and then make an index.php?routestring= request with enough instances of ".." to reach an Apache HTTP Server log file.
Remediation
Install update from vendor's website.