TITLE:
DSChat Script Insertion and PHP Code Execution Vulnerabilities

SECUNIA ADVISORY ID:
SA20258

VERIFY ADVISORY:
http://secunia.com/advisories/20258/

CRITICAL:
Highly critical

IMPACT:
Cross Site Scripting, System access

WHERE:
>From remote

SOFTWARE:
DSChat 1.x
http://secunia.com/product/10138/

DESCRIPTION:
Two vulnerabilities have been discovered in DSChat, which can be
exploited by malicious people to conduct script insertion attacks and
compromise a vulnerable system.

1) Input passed to the "ctext" parameter in send.php isn't properly
sanitised before being used. This can be exploited to inject
arbitrary HTML and script code, which will be executed in a user's
browser session in context of an affected site when the malicious
chat message is viewed.

2) Input passed to the "Nickname" field when entering a chat isn't
properly sanitised before being used to create a file in the "users"
directory. This can e.g. be exploited to create a malicious PHP
script with arbitrary content.

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

SOLUTION:
Edit the source code to ensure that input is properly sanitised.

PROVIDED AND/OR DISCOVERED BY:
1) Nomenumbra
2) Discovered by anonymous

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