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TITLE:
Advanced Guestbook Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA25153

VERIFY ADVISORY:
http://secunia.com/advisories/25153/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting, Exposure of system information, Exposure of
sensitive information

WHERE:
>From remote

SOFTWARE:
Advanced Guestbook 2.x
http://secunia.com/product/4356/

DESCRIPTION:
Jesper Jurcenoks has discovered some vulnerabilities in Advanced
Guestbook, which can be exploited by malicious people to disclose
sensitive information or to conduct cross-site scripting attacks.

1) Input passed in the "lang" cookie to index.php is not properly
verified before being used to include files. This can be exploited to
include arbitrary files from local resources.

Successful exploitation of this vulnerability with arbitrary file
extensions requires that "magic_quotes_gpc" is disabled.

2) This vulnerability is caused due to lang/codes-english.php and
images.php revealing the name of the database the program uses in
error messages.

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

Successful exploitation of vulnerability #2 and #3 requires that
"register_globals" is enabled.

The vulnerabilities are confirmed in version 2.4.2. Other versions
may also be affected.

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

Set "register_globals" in php.ini to Off.

PROVIDED AND/OR DISCOVERED BY:
Jesper Jurcenoks

ORIGINAL ADVISORY:
1) http://www.netvigilance.com/advisory0013
2) http://www.netvigilance.com/advisory0011
3) http://www.netvigilance.com/advisory0012

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