SUSE Linux Information for VU#24140

Linux kernel IP Masquerading "destination loose" (DLOOSE) configuration passes arbitrary UDP traffic

Status

Affected

Vendor Statement

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______________________________________________________________________________

                        SuSE Security Announcement

        Package: kernel < 2.2.15
        Date:    Wed, 17 May 2000 18:24:50 GMT

        Affected SuSE versions: 6.1 - 6.4
        Vulnerability Type:     bypass ipchains filter rules
                                denial of service
        SuSE default package:   yes
        Other affected systems: all linux versions using kernel 2.2.x and
                                several stateful firewall packages
______________________________________________________________________________

A security hole was discovered in the package mentioned above.
Please update as soon as possible or disable the service if you are using
this software on your SuSE Linux installation(s).

Other Linux distributions or operating systems might be affected as
well, please contact your vendor for information about this issue.

Please note that we provide this information on an "as-is" basis only.
There is no warranty whatsoever and no liability for any direct, indirect or
incidental damage arising from this information or the installation of
the update package.
_____________________________________________________________________________

1. Problem Description

  The masquerading feature in the Linux kernel has got a vulnerability in
  the udp and ftp masquerading code which allows arbitary backward
  connections to be opened.
  Some denial of service were found.

2. Impact

  Remote users may bypass ipchains filter rules protecting the internal
  network.
  Users can crash the machine.

3. Solution

  Update the package from our FTP server.
  Please note that we provide a patched 2.2.14 kernel to ensure stability
  and not the 2.2.15 kernel.
______________________________________________________________________________

Please verify these md5 checksums of the updates before installing:
(NOTE: the 6.4 updates fit 6.1 to 6.3 as well)

765e268875a7716f681c14389a1c9b9b  ftp://ftp.suse.com/pub/suse/i386/update/6.4/kernel/k_deflt.rpm
be6ee213f0cafd4dac5c51a2a8d100f0  ftp://ftp.suse.com/pub/suse/i386/update/6.4/kernel/k_eide.rpm
b900eb9f47c94df5cc15721e5f96a58e  ftp://ftp.suse.com/pub/suse/i386/update/6.4/kernel/k_i386.rpm
37deca6ee856c3242a13c2a24f32fc7f  ftp://ftp.suse.com/pub/suse/i386/update/6.4/d1/lx_suse-2.2.14.SuSE-24.i386.rpm
______________________________________________________________________________

You can find updates on our ftp-Server:

  ftp://ftp.suse.com/pub/suse/i386/update for Intel processors
  ftp://ftp.suse.com/pub/suse/axp/update  for Alpha processors

or try the following web pages for a list of mirrors:
  http://www.suse.de/ftp.html
  http://www.suse.com/ftp_new.html

Our webpage for patches:
  http://www.suse.de/patches/index.html

Our webpage for security announcements:
  http://www.suse.de/security

If you want to report vulnerabilities, please contact
  security@suse.de
______________________________________________________________________________

SuSE has got two free security mailing list services to which any
interested party may subscribe:

suse-security@suse.com          - moderated and for general/linux/SuSE
                                  security discussions. All SuSE security
                                  announcements are sent to this list.

suse-security-announce@suse.com - SuSE's announce-only mailing list.
                                  Only SuSE's security annoucements are sent
                                  to this list.

To subscribe to the list, send a message to:
     <suse-security-subscribe@suse.com>

To remove your address from the list, send a message to:
     <suse-security-unsubscribe@suse.com>

Send mail to the following for info and FAQ for this list:
     <suse-security-info@suse.com>
     <suse-security-faq@suse.com>

_____________________________________________________________________________

  This information is provided freely to everyone interested and may
  be redistributed provided that it is not altered in any way.

Type Bits/KeyID    Date       User ID
pub  2048/3D25D3D9 1999/03/06 SuSE Security Team <security@suse.de>

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Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Vendor References

None

Addendum

The CERT/CC has no additional comments at this time.

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