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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
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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.
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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.
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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
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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
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