U radu programskog paketa Postfix uočena su dva nova sigurnosna propusta. Udaljeni ih napadač može iskoristiti za DoS (eng. Denial of Service) napad, umetanje proizvoljnih naredbi te proizvoljno pokretanje programskog koda.
Sigurnosni propusti se javljaju zbog pogrešnog ograničavanja ulaznih podataka u komponenti "STARTTLS" te neodgovarajuće autentikacije u komponenti "SMTP server".
Posljedica:
Udaljeni napadač spomenute ranjivosti može iskoristiti za proizvoljno pokretanje programskog koda, napad uskraćivanjem usluga (DoS) te injekciju "plaintext" naredbi u SMTP sjednicu.
Rješenje:
Rješenje problema sigurnosti je korištenje dostupnih nadogradnji i zakrpa.
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Gentoo Linux Security Advisory GLSA 201206-33
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http://security.gentoo.org/
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Severity: High
Title: Postfix: Multiple vulnerabilities
Date: June 25, 2012
Bugs: #358085, #366605
ID: 201206-33
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Synopsis
========
A vulnerability has been found in Postfix, the worst of which possibly
allowing remote code execution.
Background
==========
Postfix is Wietse Venemaâ??s mailer that attempts to be fast, easy to
administer, and secure, as an alternative to the widely-used Sendmail
program.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 mail-mta/postfix < 2.7.4 >= 2.7.4
Description
===========
A vulnerability have been discovered in Postfix. Please review the CVE
identifier referenced below for details.
Impact
======
An attacker could perform a man-in-the-middle attack and inject SMTP
commands during the plaintext to TLS session switch or might execute
arbitrary code.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All Postfix users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-mta/postfix-2.7.4"
References
==========
[ 1 ] CVE-2011-0411
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-0411
[ 2 ] CVE-2011-1720
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-1720
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-201206-33.xml
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
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License
=======
Copyright 2012 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.5
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