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TITLE:
Lazarus Guestbook "show" and "img" Cross-Site Scripting

SECUNIA ADVISORY ID:
SA21034

VERIFY ADVISORY:
http://secunia.com/advisories/21034/

CRITICAL:
Less critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
Lazarus Guestbook 1.x
http://secunia.com/product/11020/

DESCRIPTION:
simo64 has discovered two vulnerabilities in Lazarus Guestbook, which
can be exploited by malicious people to conduct cross-site scripting
attacks.

Input passed to the "show" parameter in lang/codes-english.php and
the "img" parameter in pictures.php 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 in context
of an affected site.

Successful exploitation for the "img" parameter requires that
"magic_quotes_gpc" is disabled. 

The vulnerabilities have been confirmed in versions 1.5.4 and 1.6
beta 7. Other versions may be also affected.

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

PROVIDED AND/OR DISCOVERED BY:
simo64

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