TITLE:
Guestex Shell Command Injection and Cross-Site Scripting

SECUNIA ADVISORY ID:
SA18927

VERIFY ADVISORY:
http://secunia.com/advisories/18927/

CRITICAL:
Highly critical

IMPACT:
Cross Site Scripting, System access

WHERE:
>From remote

SOFTWARE:
Guestex 1.x
http://secunia.com/product/8125/

DESCRIPTION:
Aliaksandr Hartsuyeu has reported two vulnerabilities in Guestex,
which can be exploited by malicious people to conduct cross-site
scripting attacks and to compromise a vulnerable system.

1) Input passed to the "mail" parameter in guestex.pl isn't properly
sanitised before being passed to sendmail as an argument. This can be
exploited to inject arbitrary shell commands.

2) Input passed to the "url" parameter isn't 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.

The vulnerabilities have been reported in version 1.0. Other versions
may also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
Aliaksandr Hartsuyeu

ORIGINAL ADVISORY:
http://evuln.com/vulns/76/description.html
http://evuln.com/vulns/77/description.html

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