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TITLE:
cjGuestbook Multiple Script Insertion Vulnerabilities

SECUNIA ADVISORY ID:
SA20751

VERIFY ADVISORY:
http://secunia.com/advisories/20751/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
cjGuestbook 1.x
http://secunia.com/product/10608/

DESCRIPTION:
Some vulnerabilities have been reported in cjGuestbook, which can be
exploited by malicious people to conduct script insertion attacks.

1) Input passed to the "comments" form field parameter when posting a
guestbook entry 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
when the malicious entry is viewed and the user's browser interprets
the "javascript:" URI handler.

The vulnerability has been confirmed in version 1.2 and reported in
version 1.3. Other versions may also be affected.

2) Input passed to the "name", "email", "add", and "wName" parameters
when posting a guestbook entry 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 when the malicious entry is viewed.

The vulnerabilities have been confirmed in version 1.2. Other
versions may also be affected.

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

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

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