MyBB User Profile Skype ID Plugin "skype" Script Insertion and SQL Injection Vulnerabilities

SA51612

18 Dec 2012

03 Jan 2013

Moderately Critical

Unpatched

User Profile Skype ID 1.x (plugin for MyBB)

From remote

Cross-Site Scripting

Cross-Site Scripting vulnerabilities allow a third party to manipulate the content or behaviour of a web application in a user's browser, without compromising the underlying system.

Different Cross-Site Scripting related vulnerabilities are also classified under this category, including "script insertion" and "cross-site request forgery".

Cross-Site Scripting vulnerabilities are often used against specific users of a website to steal their credentials or to conduct spoofing attacks.

Manipulation of data

This includes vulnerabilities where a user or a remote attacker can manipulate local data on a system, but not necessarily be able to gain escalated privileges or system access.

The most frequent type of vulnerabilities with this impact are SQL-injection vulnerabilities, where a malicious user or person can manipulate SQL queries.

Two vulnerabilities have been discovered in the User Profile Skype ID plugin for MyBB, which can be exploited by malicious users to conduct script insertion and SQL injection attacks.

1) Input passed via the "skype" POST parameter to usercp.php is not properly sanitised before being used. This can be exploited to insert arbitrary HTML and script code, which will be executed in a user's browser session in context of an affected site if malicious data is viewed.

2) Input passed via the "skype" POST parameter to usercp.php is not properly sanitised before being used in a SQL query. This can be exploited to manipulate SQL queries by injecting arbitrary SQL code.

The vulnerabilities are confirmed in version 1.0. Other versions may also be affected.

No official solution is currently available.

1) limb0
2) Zixem

limb0:
http://www.exploit-db.com/exploits/23425/

Zixem:
http://zixem.altervista.org/stuff/0days/zixy.txt