LinkMax.txt

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Release date: May 21th 2001  
  
Subject: WebAvail LinkMax2 (ASP) security problem  
  
Systems affected: All systems running LinkMax2 ASP script  
  
Vendor: http://www.webavail.com  
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1. problem  
admin-system.asp of the LinkMax2 script may allow remote users  
(website visitors) to view the LinkMax2 admin login and password.  
  
2. Method  
When a user calls passcheck.asp the systems asks for a password.  
The script stores the entered login and password unencrypted in a   
client-side cookie.  
The user is being redirected to admin.asp, which verifies the  
entered login and password against those stored in the database.  
If the login and/or password is incorrect, the user is being  
redirected to passcheck.asp, but the cookie is not destroyed.  
The script admin-system.asp checks if there is a login and password  
stored in the cookie, but doesn't verifies it with the one from the  
database. Since the cookie from passcheck.asp was created but not  
destroyed the remote user is allowed to access admin-system.asp.  
This script contains the correct login and password in the source.  
When the remote user uses this login and password for passcheck.asp,  
the user can access the admin menu and can modify or delete the  
current configuration.  
  
  
3. Solution  
In all .ASP scripts, replace this code:  
  
If Request.Cookies("linkmax2login")("login") = "" AND Request.Cookies("linkmax2login")("pass") = "" then  
Response.Redirect "passcheck.asp"  
End If  
  
With this:  
  
If Request.Cookies("linkmax2login")("login") <> login AND Request.Cookies("linkmax2login")("pass") <> pass then  
Response.Redirect "passcheck.asp"  
End If  
  
However, the password is still stored in the cookie and could be read  
by any local user or might be read by using an exploit on the webbrowser.  
To solve this, change all "Request.Cookies" and "Response.Cookies" with "Session".  
  
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vertig0  
[email protected]  
  
_____________________________________________________________  
  
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