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(Red Hat Issues Fix) Postfix Symlink Dereference Bug Lets Local Users Gain Elevated Privileges
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SecurityTracker Alert ID: 1020701 |
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SecurityTracker URL: http://securitytracker.com/id/1020701
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CVE Reference:
CVE-2008-2936
(Links to External Site)
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Date: Aug 14 2008
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Impact:
Root access via local system
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Fix Available: Yes Vendor Confirmed: Yes
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Description:
A vulnerability was reported in Postfix. A local user can obtain elevated privileges on the target system.
A local user can hardlink a root-owned symbolic link to the mail spool directory (/var/mail) and cause Postfix to append mail to arbitrary existing files on the target system.
Solaris and Linux-based systems may be affected.
BSD-based, AIX, Mac OS X, and HP-UX are not affected.
The vulnerability resides in 'src/util/safe_open.c'.
Sebastian Krahmer reported this vulnerability.
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Impact:
A local user can obtain elevated privileges on the target system.
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Solution:
Red Hat has released a fix.
The Red Hat advisory is available at:
https://rhn.redhat.com/errata/RHSA-2008-0839.html
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Vendor URL: postfix.org/ (Links to External Site)
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Cause:
State error
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Underlying OS:
Linux (Red Hat Enterprise)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Thu, 14 Aug 2008 15:42:44 -0400
Subject: [RHSA-2008:0839-01] Moderate: postfix security update
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
=====================================================================
Red Hat Security Advisory
Synopsis: Moderate: postfix security update
Advisory ID: RHSA-2008:0839-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2008-0839.html
Issue date: 2008-08-14
CVE Names: CVE-2008-2936
=====================================================================
1. Summary:
Updated postfix packages that fix a security issue are now available for
Red Hat Enterprise Linux 3, 4, and 5.
This update has been rated as having moderate security impact by the Red
Hat Security Response Team.
2. Relevant releases/architectures:
Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
3. Description:
Postfix is a Mail Transport Agent (MTA), supporting LDAP, SMTP AUTH (SASL),
and TLS.
A flaw was found in the way Postfix dereferences symbolic links. If a local
user has write access to a mail spool directory with no root mailbox, it
may be possible for them to append arbitrary data to files that root has
write permission to. (CVE-2008-2936)
Red Hat would like to thank Sebastian Krahmer for responsibly disclosing
this issue.
All users of postfix should upgrade to these updated packages, which
contain a backported patch that resolves this issue.
4. Solution:
Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.
This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188
5. Bugs fixed (http://bugzilla.redhat.com/):
456314 - CVE-2008-2936 postfix privilege escalation flaw
6. Package List:
Red Hat Enterprise Linux AS version 3:
Source:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/postfix-2.0.16-14.1.RHEL3.src.rpm
i386:
postfix-2.0.16-14.1.RHEL3.i386.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.i386.rpm
ia64:
postfix-2.0.16-14.1.RHEL3.ia64.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.ia64.rpm
ppc:
postfix-2.0.16-14.1.RHEL3.ppc.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.ppc.rpm
s390:
postfix-2.0.16-14.1.RHEL3.s390.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.s390.rpm
s390x:
postfix-2.0.16-14.1.RHEL3.s390x.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.s390x.rpm
x86_64:
postfix-2.0.16-14.1.RHEL3.x86_64.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.x86_64.rpm
Red Hat Desktop version 3:
Source:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/postfix-2.0.16-14.1.RHEL3.src.rpm
i386:
postfix-2.0.16-14.1.RHEL3.i386.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.i386.rpm
x86_64:
postfix-2.0.16-14.1.RHEL3.x86_64.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.x86_64.rpm
Red Hat Enterprise Linux ES version 3:
Source:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/postfix-2.0.16-14.1.RHEL3.src.rpm
i386:
postfix-2.0.16-14.1.RHEL3.i386.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.i386.rpm
ia64:
postfix-2.0.16-14.1.RHEL3.ia64.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.ia64.rpm
x86_64:
postfix-2.0.16-14.1.RHEL3.x86_64.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.x86_64.rpm
Red Hat Enterprise Linux WS version 3:
Source:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/postfix-2.0.16-14.1.RHEL3.src.rpm
i386:
postfix-2.0.16-14.1.RHEL3.i386.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.i386.rpm
ia64:
postfix-2.0.16-14.1.RHEL3.ia64.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.ia64.rpm
x86_64:
postfix-2.0.16-14.1.RHEL3.x86_64.rpm
postfix-debuginfo-2.0.16-14.1.RHEL3.x86_64.rpm
Red Hat Enterprise Linux AS version 4:
Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/postfix-2.2.10-1.2.1.el4_7.src.rpm
i386:
postfix-2.2.10-1.2.1.el4_7.i386.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.i386.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.i386.rpm
ia64:
postfix-2.2.10-1.2.1.el4_7.ia64.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.ia64.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.ia64.rpm
ppc:
postfix-2.2.10-1.2.1.el4_7.ppc.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.ppc.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.ppc.rpm
s390:
postfix-2.2.10-1.2.1.el4_7.s390.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.s390.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.s390.rpm
s390x:
postfix-2.2.10-1.2.1.el4_7.s390x.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.s390x.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.s390x.rpm
x86_64:
postfix-2.2.10-1.2.1.el4_7.x86_64.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.x86_64.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.x86_64.rpm
Red Hat Enterprise Linux Desktop version 4:
Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/postfix-2.2.10-1.2.1.el4_7.src.rpm
i386:
postfix-2.2.10-1.2.1.el4_7.i386.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.i386.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.i386.rpm
x86_64:
postfix-2.2.10-1.2.1.el4_7.x86_64.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.x86_64.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.x86_64.rpm
Red Hat Enterprise Linux ES version 4:
Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/postfix-2.2.10-1.2.1.el4_7.src.rpm
i386:
postfix-2.2.10-1.2.1.el4_7.i386.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.i386.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.i386.rpm
ia64:
postfix-2.2.10-1.2.1.el4_7.ia64.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.ia64.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.ia64.rpm
x86_64:
postfix-2.2.10-1.2.1.el4_7.x86_64.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.x86_64.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.x86_64.rpm
Red Hat Enterprise Linux WS version 4:
Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/postfix-2.2.10-1.2.1.el4_7.src.rpm
i386:
postfix-2.2.10-1.2.1.el4_7.i386.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.i386.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.i386.rpm
ia64:
postfix-2.2.10-1.2.1.el4_7.ia64.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.ia64.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.ia64.rpm
x86_64:
postfix-2.2.10-1.2.1.el4_7.x86_64.rpm
postfix-debuginfo-2.2.10-1.2.1.el4_7.x86_64.rpm
postfix-pflogsumm-2.2.10-1.2.1.el4_7.x86_64.rpm
Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/postfix-2.3.3-2.1.el5_2.src.rpm
i386:
postfix-2.3.3-2.1.el5_2.i386.rpm
postfix-debuginfo-2.3.3-2.1.el5_2.i386.rpm
postfix-pflogsumm-2.3.3-2.1.el5_2.i386.rpm
x86_64:
postfix-2.3.3-2.1.el5_2.x86_64.rpm
postfix-debuginfo-2.3.3-2.1.el5_2.x86_64.rpm
postfix-pflogsumm-2.3.3-2.1.el5_2.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/postfix-2.3.3-2.1.el5_2.src.rpm
i386:
postfix-2.3.3-2.1.el5_2.i386.rpm
postfix-debuginfo-2.3.3-2.1.el5_2.i386.rpm
postfix-pflogsumm-2.3.3-2.1.el5_2.i386.rpm
ia64:
postfix-2.3.3-2.1.el5_2.ia64.rpm
postfix-debuginfo-2.3.3-2.1.el5_2.ia64.rpm
postfix-pflogsumm-2.3.3-2.1.el5_2.ia64.rpm
ppc:
postfix-2.3.3-2.1.el5_2.ppc.rpm
postfix-debuginfo-2.3.3-2.1.el5_2.ppc.rpm
postfix-pflogsumm-2.3.3-2.1.el5_2.ppc.rpm
s390x:
postfix-2.3.3-2.1.el5_2.s390x.rpm
postfix-debuginfo-2.3.3-2.1.el5_2.s390x.rpm
postfix-pflogsumm-2.3.3-2.1.el5_2.s390x.rpm
x86_64:
postfix-2.3.3-2.1.el5_2.x86_64.rpm
postfix-debuginfo-2.3.3-2.1.el5_2.x86_64.rpm
postfix-pflogsumm-2.3.3-2.1.el5_2.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package
7. References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2936
http://www.redhat.com/security/updates/classification/#moderate
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://www.redhat.com/security/team/contact/
Copyright 2008 Red Hat, Inc.
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