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PLSA-2008-25.txt

Posted on 15 August 2008
Source : packetstormsecurity.org Link

 

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Pardus Linux Security Advisory 2008-25 security@pardus.org.tr
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Date: 2008-08-16
Severity: 2
Type: Local
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Summary
=======

Sebastian Krahmer has reported some security issues in Postfix, which
can be exploited by malicious, local users to disclose potentially
sensitive information and perform certain actions with escalated
privileges.


Description
===========

1) A security issue is caused due to Postfix incorrectly handling
symlink files. This can be exploited to e.g. append mail messages to
arbitrary files by creating a hardlink to a symlink owned by the root
user.

Successful exploitation requires write permission to the mail spool
directory, that there is no "root" mailbox, and users can create a
hardlink to a symlink.

2) A security issue is caused due to Postfix not correctly checking the
ownership of the destination when delivering email. This can be
exploited to e.g. disclose emails by creating an insecure mailbox file
for other users.

Affected packages:

Pardus 2008:
postfix, all before 2.5.4-20-4
Pardus 2007:
postfix, all before 2.3.4-12-11


Resolution
==========

There are update(s) for postfix. You can update them via Package Manager
or with a single command from console:

Pardus 2008:
pisi up postfix

Pardus 2007:
pisi up postfix


References
==========

* http://de.postfix.org/ftpmirror/official/postfix-2.5.4.HISTORY
* http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2936
* http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2937
* http://lists.opensuse.org/opensuse-security-announce/2008-08/msg00002.html
* http://secunia.com/advisories/31485

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--
Pardus Security Team
http://security.pardus.org.tr


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