TITLE:
UBB.threads Cross-Site Scripting and File Inclusion

SECUNIA ADVISORY ID:
SA20353

VERIFY ADVISORY:
http://secunia.com/advisories/20353/

CRITICAL:
Highly critical

IMPACT:
Cross Site Scripting, System access

WHERE:
>From remote

SOFTWARE:
UBB.threads 6.x
http://secunia.com/product/4379/
UBB.threads 5.x
http://secunia.com/product/10214/

DESCRIPTION:
Mustafa Can Bjorn has discovered some vulnerabilities in UBB.threads,
which can be exploited by malicious people to conduct cross-site
scripting attacks and compromise a vulnerable system.

1) Input passed to the "myprefs[language]" parameter in
includepollresults.php isn't properly verified, before it is used to
include files. This can be exploited to include arbitrary files from
local resources.

Successful exploitation requires that "register_globals" is enabled
and "magic_quotes_gpc" is disabled.

2) Input passed to the "thispath" parameter in ubbt.inc.php isn't
properly verified, before it is used to include files. This can be
exploited to include arbitrary files from external and local
resources.

Example:
http://[host]/ubbt.inc.php?GLOBALS[thispath]=[file]

Successful exploitation requires that "register_globals" is enabled,
and that PHP 5.x or PHP versions prior to 4.1.0 is used.

3) Input passed to the "debug" parameter in ubbthreads.php and other
scripts is not properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in a
user's browser session on context of an affected site.

The vulnerabilities have been confirmed in version 6.5.1.1 (trial)
and also reported in version 5.x. Other versions may also be
affected.

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

Set "register_globals" to "Off".

PROVIDED AND/OR DISCOVERED BY:
Mustafa Can Bjorn

ORIGINAL ADVISORY:
http://www.nukedx.com/?viewdoc=40

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