Path traversal in vBulletin



| Updated: 2020-08-08
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-17671
CWE-ID CWE-22
Exploitation vector Network
Public exploit N/A
Vulnerable software
 vBulletin
Web applications / Forum & blogging software

Vendor vBulletin

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Path traversal

EUVDB-ID: #VU37761

Risk: High

CVSSv4.0: 8.1 [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 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

vBulletin: 5.0.0

CPE2.3 External links

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


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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