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Postfix local privilege escalation

Vulnerability Note VU#938323

Original Release Date: 2008-08-18 | Last Revised: 2008-08-19

Overview

The Postfix MTA contains a local privilege escalation vulnerability.

Description

Postfix is an mail transport agent (MTA) that is used by several Unix-like operating systems. Symbolic links and hard links are types of files that reference other files. Unlike hard links, symbolic links can point to directories and use relative pathnames.

On some non-POSIX.1-2001 and X/Open XPG4v2 compliant systems, users can hardlink symlinks which are owned by the root user. Postfix allows root-owned symlinks to be used as a mail destination folder. A hard link to a Postfix root-owned symlink could point to a file that can be overwritten by Postfix, regardless of the permissions of the destination file.

Impact

A local, authenticated attacker may be able to overwrite arbitrary files, possibly gaining elevated privileges.

Solution

Upgrade
See http://article.gmane.org/gmane.mail.postfix.announce/110 for information about obtaining updated software. Users who do not compile Postfix from source should see the systems affected section below for a partial list of affected vendors.


Set mailbox permissions

Making the system mail spool directory root-owned may mitigate this vulnerability. See http://article.gmane.org/gmane.mail.postfix.announce/110 for specific information about this and other workarounds.

Vendor Information

938323
 
Affected   Unknown   Unaffected

Gentoo Linux

Notified:  August 01, 2008 Updated:  August 18, 2008

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

See http://www.gentoo.org/security/en/glsa/glsa-200808-12.xml for more information.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Mandriva, Inc.

Notified:  August 01, 2008 Updated:  August 18, 2008

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

See http://archives.mandrivalinux.com/security-announce/2008-08/msg00014.php for more information.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

SUSE Linux

Notified:  August 01, 2008 Updated:  August 18, 2008

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

See http://lists.opensuse.org/opensuse-security-announce/2008-08/msg00002.html for more information.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Ubuntu

Notified:  August 01, 2008 Updated:  August 19, 2008

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

See http://www.ubuntu.com/usn/usn-74-2 for more details.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

DragonFly BSD Project

Notified:  August 01, 2008 Updated:  August 02, 2008

Status

  Not Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Sun Microsystems, Inc.

Notified:  August 01, 2008 Updated:  August 19, 2008

Status

  Not Vulnerable

Vendor Statement

Sun products do not bundle the Postfix mailer and hence we are not affected by this issue.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Sun systems with third party or unofficial Postifx packages (http://www.postfix.org/packages.html) may be vulnerable.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Apple Computer, Inc.

Notified:  August 01, 2008 Updated:  August 19, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Conectiva Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Cray Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Debian GNU/Linux

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

EMC Corporation

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Engarde Secure Linux

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

F5 Networks, Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Fedora Project

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

FreeBSD, Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Fujitsu

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Hewlett-Packard Company

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Hitachi

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

IBM Corporation

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

IBM Corporation (zseries)

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

IBM eServer

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Ingrian Networks, Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Juniper Networks, Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Microsoft Corporation

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

MontaVista Software, Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

NEC Corporation

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

NetBSD

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Nokia

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Novell, Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Openwall GNU/*/Linux

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

QNX, Software Systems, Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Red Hat, Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Silicon Graphics, Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Slackware Linux Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Sony Corporation

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

The SCO Group

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Turbolinux

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Unisys

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Wind River Systems, Inc.

Notified:  August 01, 2008 Updated:  August 01, 2008

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

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CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Acknowledgements

Thanks to Wietse Venema for information that was used in this report. Sebastian Krahmer of SuSE is credited for discovering and reporting this issue.

This document was written by Ryan Giobbi.

Other Information

CVE IDs: CVE-2008-2936
Severity Metric: 4.20
Date Public: 2008-08-18
Date First Published: 2008-08-18
Date Last Updated: 2008-08-19 14:52 UTC
Document Revision: 20

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