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TITLE:
Movable Type Multiple Weaknesses and Vulnerabilities

SECUNIA ADVISORY ID:
SA16899

VERIFY ADVISORY:
http://secunia.com/advisories/16899/

CRITICAL:
Less critical

IMPACT:
Cross Site Scripting, Spoofing, Exposure of system information,
System access

WHERE:
>From remote

SOFTWARE:
Movable Type 3.x
http://secunia.com/product/5753/

DESCRIPTION:
Tim Brown has reported some vulnerabilities and weaknesses in Movable
Type, which can be exploited by malicious users to conduct phishing
and script insertion attacks, and potentially compromise a vulnerable
system, and by malicious people to disclose certain information.

1) The problem is that different error messages are returned
depending on whether or not a supplied username exists when using the
password reset functionality. This can be exploited to enumerate valid
usernames.

2) The problem is that files with arbitrary file extensions can be
uploaded to a directory inside the web root. This can e.g. be
exploited to upload and execute a malicious PHP script.

This can further be exploited to upload files to an arbitrary
directory by specifying the blog directory path when creating a new
blog.

Successful exploitation requires privileges to upload files through
the administrative interface.

3) Input passed to certain fields when creating new blog entries
isn't properly sanitised before being used. This can be exploited to
inject arbitrary script code, which will be executed in a user's
browser session in context of an affected site when the malicious
user data is viewed.

4) The problem is that the "mt-comments.cgi" script redirects
external URLs in comments. This can be exploited to trick users into
visiting a malicious web site.

The weaknesses and the vulnerabilities have been reported in version
3.16. Other versions may also be affected.

SOLUTION:
1, 3, 4) Update to version 3.2.

2) Grant only trusted users access to upload files via the
administrative interface.

PROVIDED AND/OR DISCOVERED BY:
Tim Brown, Portcullis Computer Security Ltd

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About:
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