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Category:   Application (E-mail Server)  >   Postfix Vendors:   Postfix.org
(Mandrake Issues Fix) Re: Postfix Bounce Messages Let Remote Users Scan for Open Ports on Other Hosts
SecurityTracker Alert ID:  1007395
SecurityTracker URL:  http://securitytracker.com/id/1007395
CVE Reference:   CVE-2003-0468   (Links to External Site)
Date:  Aug 4 2003
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.1.11 and prior versions
Description:   A vulnerability was reported in Postfix. A remote user can use a Postfix server to scan for open/closed ports on other hosts.

It is reported that a remote user can use a target Postfix server to conduct bounce scans of other hosts or denial of service attacks against other hosts.

A remote user can send a probing message to the following address (RCPT TO):

<[server_ip]:service!@local-host-name>

The target Postfix server will then attempt to connect to the specified port on the specified victim server. If the specified port is open, the target Postfix server will wait until the SMTP greeting timeout occurs before queueing the message. If the specified port if closed, the target Postfix server will immediately queue the message. By examining error messages eventually returned to the sender by the target Postfix server, the remote user (i.e., the sender) can determine which ports are open/closed on the specified victim server, according to the report.

The remote user can engage many Postfix servers to direct a large number of connections to a victim server to attempt a distributed denial of service attack.

Postfix versions 1.1.12 and 2.0 are reportedly not affected.

Impact:   A remote user can scan various hosts looking for open/closed ports using the Postfrix server as the scanning agent.

A remote user can attempt to conduct distributed denial of service attacks against various hosts using the Postfix server as the attack generator.

Solution:   Mandrake has issued a fix.

Corporate Server 2.1:
2aad99a13d54ad1639f838b72c541c5c corporate/2.1/RPMS/postfix-1.1.13-1.1mdk.i586.rpm
435cada8d84f410e4991d8563e6d42a6 corporate/2.1/SRPMS/postfix-1.1.13-1.1mdk.src.rpm

Corporate Server 2.1/x86_64:
92a11a97498d15b49800691daccfde79 x86_64/corporate/2.1/RPMS/postfix-1.1.13-1.2mdk.x86_64.rpm
6f340161b82d806f11b9cad2acc36041 x86_64/corporate/2.1/SRPMS/postfix-1.1.13-1.2mdk.src.rpm

Mandrake Linux 8.2:
3d78e8d0a5c6d841697c055112fa3cc0 8.2/RPMS/postfix-20010228-20.1mdk.i586.rpm
d06d059baad0ab14b09c7612f94c7296 8.2/SRPMS/postfix-20010228-20.1mdk.src.rpm

Mandrake Linux 8.2/PPC:
56162355881b39128f60f94e2992edbb ppc/8.2/RPMS/postfix-20010228-20.1mdk.ppc.rpm
d06d059baad0ab14b09c7612f94c7296 ppc/8.2/SRPMS/postfix-20010228-20.1mdk.src.rpm

Mandrake Linux 9.0:
2aad99a13d54ad1639f838b72c541c5c 9.0/RPMS/postfix-1.1.13-1.1mdk.i586.rpm
435cada8d84f410e4991d8563e6d42a6 9.0/SRPMS/postfix-1.1.13-1.1mdk.src.rpm

Multi Network Firewall 8.2:
3d78e8d0a5c6d841697c055112fa3cc0 mnf8.2/RPMS/postfix-20010228-20.1mdk.i586.rpm
d06d059baad0ab14b09c7612f94c7296 mnf8.2/SRPMS/postfix-20010228-20.1mdk.src.rpm

Vendor URL:  www.postfix.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Mandriva/Mandrake)
Underlying OS Comments:  8.2, 9.0, Corporate Server 2.1, Multi Network Firewall 8.2

Message History:   This archive entry is a follow-up to the message listed below.
Aug 4 2003 Postfix Bounce Messages Let Remote Users Scan for Open Ports on Other Hosts



 Source Message Contents

Subject:  [Full-Disclosure] MDKSA-2003:081 - Updated postfix packages fix remote DoS


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

________________________________________________________________________

                Mandrake Linux Security Update Advisory
________________________________________________________________________

Package name:           postfix
Advisory ID:            MDKSA-2003:081
Date:                   August 4th, 2003

Affected versions:	8.2, 9.0, Corporate Server 2.1,
			Multi Network Firewall 8.2
________________________________________________________________________

Problem Description:

 Two vulnerabilities were discovered in the postfix MTA by Michal
 Zalewski.  Versions prior to 1.1.12 would allow an attacker to bounce-
 scan private networks or use the daemon as a DDoS (Distributed Denial
 of Service) tool by forcing the daemon to connect to an arbitrary
 service at an arbitrary IP address and receiving either a bounce
 message or by timing.  As well, versions prior to 1.1.12 have a bug
 where a malformed envelope address can cause the queue manager to
 lock up until an entry is removed from the queue and also lock up
 the SMTP listener leading to a DoS.
 
 Postfix version 1.1.13 corrects these issues.  The provided packages
 have been patched to fix the vulnerabilities.
________________________________________________________________________

References:
  
  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0468
  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0540
________________________________________________________________________

Updated Packages:
  
 Corporate Server 2.1:
 2aad99a13d54ad1639f838b72c541c5c  corporate/2.1/RPMS/postfix-1.1.13-1.1mdk.i586.rpm
 435cada8d84f410e4991d8563e6d42a6  corporate/2.1/SRPMS/postfix-1.1.13-1.1mdk.src.rpm

 Corporate Server 2.1/x86_64:
 92a11a97498d15b49800691daccfde79  x86_64/corporate/2.1/RPMS/postfix-1.1.13-1.2mdk.x86_64.rpm
 6f340161b82d806f11b9cad2acc36041  x86_64/corporate/2.1/SRPMS/postfix-1.1.13-1.2mdk.src.rpm

 Mandrake Linux 8.2:
 3d78e8d0a5c6d841697c055112fa3cc0  8.2/RPMS/postfix-20010228-20.1mdk.i586.rpm
 d06d059baad0ab14b09c7612f94c7296  8.2/SRPMS/postfix-20010228-20.1mdk.src.rpm

 Mandrake Linux 8.2/PPC:
 56162355881b39128f60f94e2992edbb  ppc/8.2/RPMS/postfix-20010228-20.1mdk.ppc.rpm
 d06d059baad0ab14b09c7612f94c7296  ppc/8.2/SRPMS/postfix-20010228-20.1mdk.src.rpm

 Mandrake Linux 9.0:
 2aad99a13d54ad1639f838b72c541c5c  9.0/RPMS/postfix-1.1.13-1.1mdk.i586.rpm
 435cada8d84f410e4991d8563e6d42a6  9.0/SRPMS/postfix-1.1.13-1.1mdk.src.rpm

 Multi Network Firewall 8.2:
 3d78e8d0a5c6d841697c055112fa3cc0  mnf8.2/RPMS/postfix-20010228-20.1mdk.i586.rpm
 d06d059baad0ab14b09c7612f94c7296  mnf8.2/SRPMS/postfix-20010228-20.1mdk.src.rpm
________________________________________________________________________

Bug IDs fixed (see https://qa.mandrakesoft.com for more information):
________________________________________________________________________

To upgrade automatically, use MandrakeUpdate or urpmi.  The verification
of md5 checksums and GPG signatures is performed automatically for you.

A list of FTP mirrors can be obtained from:

  http://www.mandrakesecure.net/en/ftp.php

All packages are signed by MandrakeSoft for security.  You can obtain
the GPG public key of the Mandrake Linux Security Team by executing:

  gpg --recv-keys --keyserver www.mandrakesecure.net 0x22458A98

Please be aware that sometimes it takes the mirrors a few hours to
update.

You can view other update advisories for Mandrake Linux at:

  http://www.mandrakesecure.net/en/advisories/

MandrakeSoft has several security-related mailing list services that
anyone can subscribe to.  Information on these lists can be obtained by
visiting:

  http://www.mandrakesecure.net/en/mlist.php

If you want to report vulnerabilities, please contact

  security_linux-mandrake.com

Type Bits/KeyID     Date       User ID
pub  1024D/22458A98 2000-07-10 Linux Mandrake Security Team
  <security linux-mandrake.com>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQE/LfngmqjQ0CJFipgRArn3AJ9GzzUYjosBo65dkA+MP+6wq+7rTgCgrWuB
6UpA1SQaJC7jyYPeOiJM/7s=
=HK0e
-----END PGP SIGNATURE-----
_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html


 
 


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