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Red Hat Linux Advisory: postfix

Aug 04, 2003, 16:59 (4 Talkback[s])

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:  
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:


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:



Red Hat Linux 8.0:



Red Hat Linux 9:



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:


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.