Linux Security
Linux Security
Linux Security

Debian: New shorewall packages fix firewall bypass

Date 08 Oct 2005
Posted By Joe Shakespeare
Updated package.
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Debian Security Advisory DSA 849-1                     This email address is being protected from spambots. You need JavaScript enabled to view it.                             Martin Schulze
October 8th, 2005             
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Package        : shorewall
Vulnerability  : programming error
Problem type   : remote
Debian-specific: no
CVE ID         : CAN-2005-2317
Debian Bug     : 318946

"Supernaut" noticed that shorewall, the Shoreline Firewall, could
generate an iptables configuration which is significantly more
permissive than the rule set given in the shorewall configuration, if
MAC verification are used in a non-default manner.

When MACLIST_DISPOSITION is set to ACCEPT in the shorewall.conf file,
all packets from hosts which fail the MAC verification pass through
the firewall, without further checks.  When MACLIST_TTL is set to a
non-zero value, packets from hosts which pass the MAC verification
pass through the firewall, again without further checks.

The old stable distribution (woody) is not affected by this problem.

For the stable distribution (sarge) this problem has been fixed in
version 2.2.3-2.

For the unstable distribution (sid) this problem has been fixed in
version 2.4.1-2.

We recommend that you upgrade your shorewall package.

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 3.1 alias sarge
- --------------------------------

  Source archives:
      Size/MD5 checksum:      656 a280401e705da1a93b31e2b0d6abafb9
      Size/MD5 checksum:    34181 e6d35af167daece754b263fb77285960
      Size/MD5 checksum:   126841 df114b25a419d77915598de5844b423e

  Architecture independent components:
      Size/MD5 checksum:   151538 556f925a3f6393e1b7376686c1796d89

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

- ---------------------------------------------------------------------------------
For apt-get: deb stable/updates main
For dpkg-ftp: dists/stable/updates/main
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