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Topic :

Movable Type <= 3.33 XSS Exploit

SecurityAlert : 2821

CVE : CVE-2007-3342

SecurityRisk : Low Security Risk Low

(About)

Remote Exploit : Yes

Local Exploit : No

Exploit Given : Yes

Credit : teracci2002

Published : 26.06.2007

Affected Software :

Movable Type <= 3.33

Advisory Text :

[Description]
MT (Movable Type) is a Blog software.
MT has a XSS filter to remove scripts from user inputs,
but there are ways to evade the filter using malformed input.

[Affected]
Movable Type <= 3.33

[Exploit]
By the default, Blog readers are allowed to post comments
containing html tags.

Attackers may post malformed comments as below.

1. NULL byte in number entitiy reference.
<A href="javascript[0x00]8;alert();">link</A>

2. Unfinished tag in the tail of comment.
<P><BR style="xss:expression(alert())"

MT's filter fails to sanitize these comments.
Scripts in these comments may run in certain browsers
(maybe in IE ONLY).

[Impact]
- Cookies theft.
- Web pages defacing.

[Solution]
Upgrade MT to the newest version.
Six Apart fixed these problems in v3.34.

[Links]
http://www.sixapart.com/movabletype/beta/distros/MT-3.34-beta-Release-No
tes.html
See #46226.

----
teracci2002 (at) yahoo.co (dot) jp [email concealed]

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