TITLE:
MailSite Express Attachment Upload Vulnerability

SECUNIA ADVISORY ID:
SA17240

VERIFY ADVISORY:
http://secunia.com/advisories/17240/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
MailSite 6.x
http://secunia.com/product/5898/

DESCRIPTION:
Soroush dalili has discovered a vulnerability in MailSite Express,
which can be exploited by malicious users to compromise a vulnerable
system.

The problem is that it is possible to upload attachments with an
arbitrary file extension to a cache folder with a predictable name
inside the web root. This can be exploited to upload and execute
malicious script files (e.g. PHP and ASP scripts).

The vulnerability has been confirmed in version 6.1.20. Other
versions may also be affected.

SOLUTION:
Configure IIS to remove execution permissions for scripts in the
"Web\Cache" directory. This will however not stop malicious users
from uploading HTML documents containing malicious script code.

Use another product.

PROVIDED AND/OR DISCOVERED BY:
Soroush dalili, Grayhatz security group

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