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Sicherheit: Preisgabe von Portforwarding-Informationen in netfilter
Aktuelle Meldungen Distributionen
Name: Preisgabe von Portforwarding-Informationen in netfilter
ID: MDKSA-2002:030
Distribution: Mandrake
Plattformen: Mandrake 8.0, Mandrake 8.1, Mandrake 8.2
Datum: Fr, 10. Mai 2002, 13:00
Referenzen: Keine Angabe
Applikationen: Linux

Originalnachricht

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________________________________________________________________________

Mandrake Linux Security Update Advisory
________________________________________________________________________

Package name: iptables/kernel
Advisory ID: MDKSA-2002:030
Date: May 9th, 2002
Affected versions: 8.0, 8.1, 8.2
________________________________________________________________________

Problem Description:

A problem was discovered with Netfilter Network Address Translation
(NAT) capabilities. It was found that iptables can leak information
about how port forwarding is accomplished in unfiltered ICMP packets.
When a NAT rule applies to the first packet of a connection, which
subsequently causes the system to generate an ICMP error message, the
ICMP error message is transmitted including the translated address.
This information gives the IP address of the system to which the
connection would have been forwarded had the error message not been
generated, exposing information about the netfilter configuration and
the network topology.

There is currently no clean fix for this problem, but a fix is being
worked on. In the meantime, if you use the NAT capabilities of
iptables, you can protect yourself by filtering out untracked local
ICMP packets using the following iptables command:

iptables -A OUTPUT -m state -p icmp --state INVALID -j DROP

All kernel patches from iptables < 1.2.6a are vulnerable. All kernel
versions from 2.4.4 and up to (at least) 2.4.19-pre6 use a vulnerable
version. Thanks to Philippe Biondi for discovering this problem.
________________________________________________________________________

References:

http://online.securityfocus.com/archive/1/271530/2002-05-06/2002-05-12/0
________________________________________________________________________

Updated Packages:

None currently available.
________________________________________________________________________

Bug IDs fixed (see https://qa.mandrakesoft.com for more information):

________________________________________________________________________

To upgrade automatically, use MandrakeUpdate. The verification of md5
checksums and GPG signatures is performed automatically for you.

If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm". A list of
FTP mirrors can be obtained from:

http://www.mandrakesecure.net/en/ftp.php

Please verify the update prior to upgrading to ensure the integrity of
the downloaded package. You can do this with the command:

rpm --checksig <filename>

All packages are signed by MandrakeSoft for security. You can obtain
the GPG public key of the Mandrake Linux Security Team from:

https://www.mandrakesecure.net/RPM-GPG-KEYS

Please be aware that sometimes it takes the mirrors a few hours to
update.

You can view other update advisories for Mandrake Linux at:

http://www.mandrakesecure.net/en/advisories/

MandrakeSoft has several security-related mailing list services that
anyone can subscribe to. Information on these lists can be obtained by
visiting:

http://www.mandrakesecure.net/en/mlist.php

If you want to report vulnerabilities, please contact

security@linux-mandrake.com
________________________________________________________________________

Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team
<security@linux-mandrake.com>


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