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TITLE:
Hogstorps guestbook Authentication Bypass and Script Insertion

SECUNIA ADVISORY ID:
SA20402

VERIFY ADVISORY:
http://secunia.com/advisories/20402/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
Hogstorps guestbook 2.x
http://secunia.com/product/10281/

DESCRIPTION:
Some vulnerabilities have been discovered in Hogstorps guestbook,
which can be exploited by malicious people to bypass certain security
restrictions and conduct script insertion attacks.

1) Improper authentication in admin/radera/tabort.asp and
admin/redigera/redigera2.asp can be exploited to edit and delete
arbitrary guestbook entries.

2) Input passed to the "name", "email", and "headline" form field
parameters when posting a message 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.

The vulnerabilities have been confirmed in version 2.0. Other
versions may also be affected.

SOLUTION:
Restrict access to admin/radera and admin/redigera.

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

Use another product.

PROVIDED AND/OR DISCOVERED BY:
1) omnipresent
2) Reported by an anonymous person.

ORIGINAL ADVISORY:
http://colander.altervista.org/advisory/HTGuestBook2.txt

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