Plugin ID | 7 |
Plugin name | SMTP HELP detection |
Plugin filename | SMTP HELP detection.plugin |
Plugin filesize | 2645 bytes |
Plugin family | SMTP |
Plugin created name | Marc Ruef |
Plugin created email | marc dot ruef at computec dot ch |
Plugin created web | http://www.computec.ch |
Plugin created company | computec.ch |
Plugin created date | 2003/11/13 |
Plugin updated name | Marc Ruef |
Plugin updated email | marc dot ruef at computec dot ch |
Plugin updated web | http://www.computec.ch |
Plugin updated company | computec.ch |
Plugin updated date | 2004/11/13 |
Plugin version | 2.0 |
Plugin changelog | Corrected the plugin structure and added the accuracy values in 1.3. Improved the pattern matching and added the changelog in 2.0 |
Plugin protocol | tcp |
Plugin port | 25 |
Plugin procedure detection | open|send HELP\n|sleep|close|pattern_exists 220 *HELP* |
Plugin detection accuracy | 70 |
Plugin comment | This plugin was written with the ATK Attack Editor. |
Bug affected | Most mail transfer agents |
Bug not affected | Hardened mail transfer agents |
Bug vulnerability class | Configuration |
Bug description | The mail server allows the HELP commando. A malicous user could use this to verify the availablity of certain SMTP commands. He could also enumerate the mail server. |
Bug solution | Do not allow the HELP command to prevent further enumeration. Check the manual of your mail server howto set the configuration correctly. Additionally prevent unwanted SMTP connections with firewalling. |
Bug fixing time | 10 minutes |
Bug exploit availability | Yes |
Bug remote | Yes |
Bug local | Yes |
Bug severity | Low |
Bug popularity | 9 |
Bug simplicity | 9 |
Bug impact | 2 |
Bug risk | 6 |
Bug check tools | Nessus is able to do the check automated. Mostly attackers prefer to test the HELP support with a simple telnet or NetCat connection. |
Source Literature | Hacking Intern - Angriffe, Strategien, Abwehr, Marc Ruef, Marko Rogge, Uwe Velten and Wolfram Gieseke, November 1, 2002, Data Becker, Düsseldorf, ISBN 381582284X |
Source Misc. | http://www.computec.ch |