CVE-2017-17671 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://blogs.securiteam.com/index.php/archives/3569

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8