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Debian: New refpolicy packages fix incompatible policy Print E-mail
User Rating:      How can I rate this item?
Posted by Benjamin D. Thomas   
Debian In DSA-1603-1, Debian released an update to the BIND 9 domain name server, which introduced UDP source port randomization to mitigate the threat of DNS cache poisoning attacks (identified by the Common Vulnerabilities and Exposures project as CVE-2008-1447)
- ------------------------------------------------------------------------
Debian Security Advisory DSA-1617-1                  security@debian.org
http://www.debian.org/security/                           Devin Carraway
July 25, 2008                         http://www.debian.org/security/faq
- ------------------------------------------------------------------------

Package        : refpolicy
Vulnerability  : incompatible policy
Problem type   : local
Debian-specific: no
CVE Id(s)      : CVE-2008-1447
Debian Bug     : 490271

In DSA-1603-1, Debian released an update to the BIND 9 domain name
server, which introduced UDP source port randomization to mitigate
the threat of DNS cache poisoning attacks (identified by the Common
Vulnerabilities and Exposures project as CVE-2008-1447).  The fix,
while correct, was incompatible with the version of SELinux Reference
Policy shipped with Debian Etch, which did not permit a process
running in the named_t domain to bind sockets to UDP ports other than
the standard 'domain' port (53).  The incompatibility affects both
the 'targeted' and 'strict' policy packages supplied by this version
of refpolicy.

This update to the refpolicy packages grants the ability to bind to
arbitrary UDP ports to named_t processes.  When installed, the
updated packages will attempt to update the bind policy module on
systems where it had been previously loaded and where the previous
version of refpolicy was 0.0.20061018-5 or below.

Because the Debian refpolicy packages are not yet designed with
policy module upgradeability in mind, and because SELinux-enabled
Debian systems often have some degree of site-specific policy
customization, it is difficult to assure that the new bind policy can
be successfully upgraded.  To this end, the package upgrade will not
abort if the bind policy update fails.  The new policy module can be
found at /usr/share/selinux/refpolicy-targeted/bind.pp after
installation.  Administrators wishing to use the bind service policy
can reconcile any policy incompatibilities and install the upgrade
manually thereafter.  A more detailed discussion of the corrective
procedure may be found here:

  http://wiki.debian.org/SELinux/Issues/BindPortRandomization

For the stable distribution (etch), this problem has been fixed in
version 0.0.20061018-5.1+etch1.  The unstable distribution (sid) is
not affected, as subsequent refpolicy releases have incorporated an
analogous change.

We recommend that you upgrade your refpolicy packages.

Upgrade instructions
- --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian GNU/Linux 4.0 alias etch
- -------------------------------

Debian (stable)
- ---------------

Stable updates are available for alpha, amd64, arm, hppa, i386, ia64, mips, mipsel, powerpc, s390 and sparc.

Source archives:

  http://security.debian.org/pool/updates/main/r/refpolicy/refpolicy_0.0.20061018.orig.tar.gz
    Size/MD5 checksum:   571487 1bb326ee1b8aea1fa93c3bd86a3007ee
  http://security.debian.org/pool/updates/main/r/refpolicy/refpolicy_0.0.20061018-5.1+etch1.diff.gz
    Size/MD5 checksum:    53515 bd171f0cfa9adc59d451d176fb32c913
  http://security.debian.org/pool/updates/main/r/refpolicy/refpolicy_0.0.20061018-5.1+etch1.dsc
    Size/MD5 checksum:      859 52bc8ea0cab864e990e9dacc4db3b678

Architecture independent packages:

  http://security.debian.org/pool/updates/main/r/refpolicy/selinux-policy-refpolicy-strict_0.0.20061018-5.1+etch1_all.deb
    Size/MD5 checksum:  1541610 626c93fc13beaa01ff151d9103a7860b
  http://security.debian.org/pool/updates/main/r/refpolicy/selinux-policy-refpolicy-doc_0.0.20061018-5.1+etch1_all.deb
    Size/MD5 checksum:   289230 b082a861eda93f9bc06dd2e2f03ba89d
  http://security.debian.org/pool/updates/main/r/refpolicy/selinux-policy-refpolicy-targeted_0.0.20061018-5.1+etch1_all.deb
    Size/MD5 checksum:  1288314 c00ed4f0ea4ddbb8dd945c24c710c788
  http://security.debian.org/pool/updates/main/r/refpolicy/selinux-policy-refpolicy-src_0.0.20061018-5.1+etch1_all.deb
    Size/MD5 checksum:   595490 841f616c8f08b22ed7077c21c1065026
  http://security.debian.org/pool/updates/main/r/refpolicy/selinux-policy-refpolicy-dev_0.0.20061018-5.1+etch1_all.deb
    Size/MD5 checksum:   418666 bee3f41fe8771b7b88693937814494a3


  These files will probably be moved into the stable distribution on
  its next update.

- ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
 
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