SecurityTracker.com
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 


Category:   Application (E-mail Server)  >   Postfix Vendors:   Postfix.org
(Red Hat Issues Fix) Postfix Bounce Messages Let Remote Users Scan for Open Ports on Other Hosts
SecurityTracker Alert ID:  1007397
SecurityTracker URL:  http://securitytracker.com/id/1007397
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:   Red Hat has released a fix.

Red Hat Linux 7.3:

SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/postfix-1.1.12-0.7.src.rpm

i386:
ftp://updates.redhat.com/7.3/en/os/i386/postfix-1.1.12-0.7.i386.rpm

Red Hat Linux 8.0:

SRPMS:
ftp://updates.redhat.com/8.0/en/os/SRPMS/postfix-1.1.12-0.8.src.rpm

i386:
ftp://updates.redhat.com/8.0/en/os/i386/postfix-1.1.12-0.8.i386.rpm

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/postfix-1.1.12-1.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/postfix-1.1.12-1.i386.rpm


The verification checksums are:

MD5 sum Package Name
1c17ca698971a1b5904590b97c0cbf8f 7.3/en/os/SRPMS/postfix-1.1.12-0.7.src.rpm
d862e447c46cc4587dc96d4d44ef1a58 7.3/en/os/i386/postfix-1.1.12-0.7.i386.rpm
e9e79099eb8e23dc0eff8f26d059cf53 8.0/en/os/SRPMS/postfix-1.1.12-0.8.src.rpm
48e8299644a815e5dd67e67ef9aff8b5 8.0/en/os/i386/postfix-1.1.12-0.8.i386.rpm
4c1500d10e8533eda4168a0cd193b561 9/en/os/SRPMS/postfix-1.1.12-1.src.rpm
b3345751920862dc4ab2e82bcc0c51f9 9/en/os/i386/postfix-1.1.12-1.i386.rpm

Vendor URL:  www.postfix.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Linux)
Underlying OS Comments:  7.3, 8.0, 9

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:  [RHSA-2003:251-01] New postfix packages fix security issues.


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

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          New postfix packages fix security issues.
Advisory ID:       RHSA-2003:251-01
Issue date:        2003-08-04
Updated on:        2003-08-04
Product:           Red Hat Linux
Keywords:          postfix envelope address
Cross references:  
Obsoletes:         
CVE Names:         CAN-2003-0468 CAN-2003-0540
- ---------------------------------------------------------------------

1. Topic:

New Postfix packages that fix two potential security issues are now available.

2. Relevant releases/architectures:

Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386
Red Hat Linux 9 - i386

3. Problem description:

Postfix is a Mail Transport Agent (MTA).

Two security issues have been found in Postfix that affect the Postfix
packages in Red Hat Linux 7.3, 8.0, and 9. 

Postfix versions before 1.1.12 allow an attacker to bounce-scan private
networks, or use the daemon as a DDoS tool by forcing the daemon to connect
to an arbitrary service at an arbitrary IP address and receiving either a
bounce message or by analyzing timing.  The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the name CAN-2003-0468 to
this issue.

Postfix versions from 1.1 up to and including 1.1.12 have a bug where a
remote attacker could send a malformed envelope address and:

1) cause the queue manager to lock up until an entry is removed from the
queue or,

2) lock up the SMTP listener, leading to a DoS.

The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2003-0540 to this issue.

Users of Postfix are advised to upgrade to these erratum packages, which
contain a version of Postfix 1.1.12 with the addition of a security patch
and is not vulnerable to either of these issues.

Red Hat would like to thank Michal Zalewski for discovering and disclosing
the flaws and to Wietse Venema for providing patches.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. RPMs required:

Red Hat Linux 7.3:

SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/postfix-1.1.12-0.7.src.rpm

i386:
ftp://updates.redhat.com/7.3/en/os/i386/postfix-1.1.12-0.7.i386.rpm

Red Hat Linux 8.0:

SRPMS:
ftp://updates.redhat.com/8.0/en/os/SRPMS/postfix-1.1.12-0.8.src.rpm

i386:
ftp://updates.redhat.com/8.0/en/os/i386/postfix-1.1.12-0.8.i386.rpm

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/postfix-1.1.12-1.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/postfix-1.1.12-1.i386.rpm



6. Verification:

MD5 sum                          Package Name
- --------------------------------------------------------------------------
1c17ca698971a1b5904590b97c0cbf8f 7.3/en/os/SRPMS/postfix-1.1.12-0.7.src.rpm
d862e447c46cc4587dc96d4d44ef1a58 7.3/en/os/i386/postfix-1.1.12-0.7.i386.rpm
e9e79099eb8e23dc0eff8f26d059cf53 8.0/en/os/SRPMS/postfix-1.1.12-0.8.src.rpm
48e8299644a815e5dd67e67ef9aff8b5 8.0/en/os/i386/postfix-1.1.12-0.8.i386.rpm
4c1500d10e8533eda4168a0cd193b561 9/en/os/SRPMS/postfix-1.1.12-1.src.rpm
b3345751920862dc4ab2e82bcc0c51f9 9/en/os/i386/postfix-1.1.12-1.i386.rpm


These packages are GPG signed by Red Hat for security.  Our key is
available from http://www.redhat.com/security/keys.html

You can verify each package with the following command:
    
    rpm --checksig -v <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    
    md5sum <filename>


7. 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

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at http://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQE/LnIaXlSAg2UNWIIRAhlAAJ43FkwP+L6U1AeJvNGx7CyCxSzYBQCgoTRP
P3hTM1cKjQSM3Bd1gPHmqKI=
=Zeh4
-----END PGP SIGNATURE-----


_______________________________________________
Redhat-watch-list mailing list
To unsubscribe, visit: https://www.redhat.com/mailman/listinfo/redhat-watch-list

 
 


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

This web site uses cookies for web analytics. Learn More

Copyright 2020, SecurityGlobal.net LLC