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Category:   Application (Web Server/CGI)  >   WebBoard Vendors:   ChatSpace, O'Reilly
ChatSpace (O'Reilly) WebBoard Lets Remote Users Execute Arbitrary Javascript Code
SecurityTracker Alert ID:  1001680
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jun 5 2001
Impact:   Execution of arbitrary code via network
Exploit Included:  Yes  

Description:   A vulnerability has been reported in ChatSpace's WebBoard (also known as O'Reilly WebBoard) that allows one WebBoard user to execute arbitrary Javascript code on another WebBoard user's host.

It is reported that WebBoard contains a vulnerable paging function that allows one user to send a message to another user. The recipient will receive a Javascript pop-up window that is produced with the alert() function and that contains the message from the sender. However, the sender can reportedly close the alert() function and then execute arbitrary code on the recipient's host.

A demonstration exploit example is included in the Source Message.

Impact:   A remote user can execute arbitrary Javascript code on another user's host.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Windows (Me), Windows (NT), Windows (95), Windows (98), Windows (2000)

Message History:   None.

 Source Message Contents

Subject:  O'Reilly WebBoard 4.10.30 JavaScript code execution problem

I found following problem in the WebBoard:
 The Board has a paging function. User A can send a message to user B. User
B gets a javascript popup (produced with alert()) with the message from user
The problem is that user A can close the alert() function and so he can
execute his javascript code on user B's machine.

Example of a message wich executes my code:
\');for(i=0;i<100000;i++) alert("not nice"); //

There is a function that escapes the ' but if i escape it it will be escaped
a second time ... the effect is that then the \ will escaped and the alert
is closed. so after that i can put my code! // (comment) this comment is
needed becaus there is still a '); from the alert, with the help of the
commen this will not produce an error.

greets helli


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