Multiple remote code execution vulnerabilities in vBulletin

Published: 2017-12-18 11:05:03
Severity High
Patch available NO
Number of vulnerabilities 2
CVE ID CVE-2017-17672
CVSSv3 9.4 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:U/RC:C]
9.4 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:U/RC:C]
CWE ID CWE-94
CWE-502
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Public exploit code for vulnerability #2 is available.
Vulnerable software vBulletin
Vulnerable software versions vBulletin 5.0
Vendor URL vBulletin

Security Advisory

1) PHP code injection

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists in vBulletin installations on Windows OS due to the file inclusion vulnerability with parameter routestring=. A remote unauthenticated attacker can send a GET request to /index.php, inject malicious PHP code into a file on the server (e.g. access.log), “include” that file in the request and execute arbitrary PHP code.

Successful exploitation of the vulnerability may result in system compromise.

Remediation

Cybersecurity Help is currently unaware of any solutions addressing the vulnerability.

External links

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

2) Deserialization of untrusted data

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to unsafe usage of PHP’s unserialize() on user-supplied input. A remote attacker can trigger a flaw in vB_Library_Template’s cacheTemplates() function, fetch information on a set of given templates from the database in order to store them inside a cache variable, delete arbitrary files and execute arbitrary code on a vBulletin installation.

Successful exploitation of the vulnerability may result in system compromise.

Remediation

Cybersecurity Help is currently unaware of any solutions addressing the vulnerability.

External links

https://blogs.securiteam.com/index.php/archives/3573

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