-----  B a l a B i t   S e c u r i t y   A d v i s o r y   ( B B S A )  -----
PACKAGE             : postfix
AFFECTED VERSION    : <= 2.2.8-1.zorpos4, <= 2.2.10-1ubuntu0.1.zorpos33.2
FIXED               : 2.2.8-1.zorpos5, 2.2.10-1ubuntu0.1.zorpos33.3
SUMMARY             : privilege escalation
TYPE                : local
AFFECTED            : ZorpOS 3.1, ZorpOS 3.3
ZORP-OS SPECIFIC    : NO
BBSA-AUTHOR         : Tamás Pál <tamas.pal@balabit.hu>
BBSA-ID             : BBSA-2008-040
BBSA-ADDRESS        : advisory@balabit.hu
GNUPG FINGERPRINT   : 933E 6763 D32D A01C 1A75  F228 9CB1 81C7 D91E 8915
CVE                 : CVE-2008-2936
DATE                : Aug 21, 2008
-----------------------------------------------------------------------------

BACKGROUND:

  Sebastian Krahmer discovered that Postfix was not correctly handling
  mailbox ownership when dealing with Linux's implementation of hardlinking
  to symlinks.  In certain mail spool configurations, a local attacker could
  exploit this to append data to arbitrary files as the root user. The
  default configuration was not vulnerable.

SOLUTION:

  We recommend that you update the affected packages immediately.

  Upgrading using apt:
  ~~~~~~~~~~~~~~~~~~~~
  Add the following line to /etc/apt/sources.list (if it doesn't
  contain this line already)

  ZorpOS version 3.1:

    deb https://USERNAME:PASSWORD@apt.balabit.hu/zorp-os \
      zorp-os-3.1/3.1security zorp-os zorp-os-extra

  ZorpOS version 3.3:

    deb https://USERNAME:PASSWORD@apt.balabit.hu/zorp-os \
      zorp-os-3.3/3.3security zorp-os zorp-os-extra

  then issue the following commands as root:

  apt-get update

  apt-get -u upgrade

  The latest upgrades will be downloaded and installed.

REFERENCES:

  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2936
  http://www.ubuntu.com/usn/usn-636-1