PT-2017-14947 · Vbulletin Solutions+1 · Vbulletin+1
Published
2017-12-14
·
Updated
2020-08-14
·
CVE-2017-17671
CVSS v3.1
9.8
Critical
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
vBulletin versions prior to 5.4
Description
The issue allows remote PHP code execution due to an unauthenticated request that can include directory traversal sequences to specify an arbitrary pathname. Specifically, while ../ traversal is blocked, .. traversal is not, enabling an attacker to potentially access and manipulate files. For instance, an attacker could send an invalid HTTP request with PHP code and then use an index.php?routestring= request with sufficient ".." instances to reach an Apache HTTP Server log file.
Recommendations
For versions prior to 5.4, update to version 5.4 or later to resolve the issue. As a temporary workaround, consider restricting access to the routestring parameter in the index.php endpoint to minimize the risk of exploitation.
Exploit
Fix
Path traversal
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Weakness Enumeration
Related Identifiers
Affected Products
Apache Http Server
Vbulletin