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TITLE:
G5-Scripts Guestbook PHP Script Insertion Vulnerabilities

SECUNIA ADVISORY ID:
SA39596

VERIFY ADVISORY:
http://secunia.com/advisories/39596/

DESCRIPTION:
Valentin Hoebel has discovered some vulnerabilities in G5 Scripts
Guestbook PHP, which can be exploited by malicious people to conduct
script insertion attacks.

Input passed to the "name", "vorname", "land", and "homepage"
parameters in guestbook.php is not properly sanitised before being
displayed to the user. 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 when the malicious data is being viewed.

The vulnerabilities are confirmed in version 1.2.8. Other versions
may also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
Valentin Hoebel

ORIGINAL ADVISORY:
http://www.xenuser.org/documents/security/guestbook_php_xss.txt

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