Re: ColdFusion cross-site scripting security vulnerability of an error page

["morning_wood" <se_cur_ity () hotmail com>]

they ( Macromedia ) downplayed this..
http://nothackers.org/pipermail/0day/2003-June/000028.html
http://nothackers.org/pipermail/0day/2003-June/000029.html
http://nothackers.org/pipermail/0day/2003-June/000030.html
as i am sure they will do with yours, as they think XSS is not
a security issue.

D. Werner
CTO E2 Labs Infosec
http://e2-labs.com

----- Original Message -----
From: <sec () v23 org>
To: <full-disclosure () lists netsys com>
Sent: Tuesday, September 23, 2003 10:39 AM
Subject: [Full-disclosure] ColdFusion cross-site scripting security
vulnerability of an error page


> ColdFusion cross-site scripting security vulnerability of an error page
>
> > > The outline of vulnerability
>
> Macromedia's ColdFusion can display the various information about an
> error at the time of error occurred.
> There is information transmitted from a client machine like "Referer".
> ColdFusion displays the information as it is.
> An attacker can execute a script on victim's browser by preparing for
> WEB the link which embedded arbitrary scripts.
>
>
> > > User's risk
>
> The user who accesses a vulnerable server has a risk that forced to
> execute the arbitrary javascript and HTML code which the attacker
> embedded.
> Risks of being assumed are below.
>  session high-jack ( by stolen cookie )
>  page defacement by embedded html tags.
>  etc.
> It is insecure to store critical information ( such as personal
> information ) without encryption in cookie. Such a poor
>  application will make risk bigger when session-highjack occurs.
>
>
> > > The range of influence
>
> This problem is contained in the error page of all versions of
> ColdFusion.
> This problem does not occurred when ColdFusion's error page does not
> include the contents transmitted from client machines ( such as "Referer"
>  ).
>
>
> > > About vulnerability
>
> In Cold Fusion, an error screen is displayed at the time of error
> occurred.
> It is possible to display the contents transmitted from the client
> machine (#error.HTTPReferer#) as it is.
> When the code for an attack is contained in the contents to display, a
> cross-site scripting attack can be executed.
>
> For example, the script will be executed when the script for an attack
> is embedded by "Referer" in #error.HTTPReferer#, and an error screen is
> displayed.
> The same problem exists in the #error.QueryString# .
>
>
> > > Sample attack
>
> User using Cold Fusion of the site A (www.CFtestA.com).
> The method of stealing cookie is bellow.
>
> 1. An attacker creates the page B (www.atack_testA.com/cf.html) with the
> link to the site A.
> 2. Next, after considering the invitation complaint which is easy to
> guide victims, such as present collection, to another page, the link to
> Page B is attached.
> A code for an attack is embedded into this link, that code remains as
> "Referer" information as it is, and when it clicks the link to the site
> A which has a victim in Page B, it will be executed.
> Example: <a href ="http://www.atack_testA.com/cf.html?<script>alert
> (document.cookie) </script>"> GET PRIZE! HERE'S PRIZE LINKS!</a>
>
> When cookie is published in site A, it can steal by this method.
> In addition, cf.html does not need to have the mechanisms (CGI etc.).
> The code below "?" is disregarded.   cf.html is only displayed.
> However, an attack becomes possible in order for "?" or subsequent ones
> to remain in "Referer" as it is.
> By changing the code embedded by the same method, it becomes possible to
> execute arbitrary codes.
>
>
> > > Solution
>
> The patch corresponding to this problem is distributed at Macromedia.
> A patch can come to hand by Following URL.
> URL of http://www.macromedia.com/devnet/security/security_zone/mpsb03-06.
> html
> Moreover, you should not use an error page which displays the contents
> transmitted from a client machine as it is irrespective of the existence
> of patch application.
> Although it may be necessity at the debugging time, it is dangerous with
> real operation environment.
>
> T.Hara , Scan Security Wire http://www.scan-web.com/ .
> http://www.scan-web.com/jvi/index.cgi
>
>
>
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