openSUSE Security October 1999

security@lists.opensuse.org

60 participants
63 discussions

security/firewall help needed
by jfondow 11 Oct '99

11 Oct '99

I am soon to get a cable modem and need to set-up some security. I am running ip-masq for my home network. I have one machince that is a file and print server as well as serving as my pipe to the internet. I have another suse box and a windows box on the home lan. The box I will be setting this up on is running SuSE6.1 w/ kernel 2.2.2. Any and all help would be greatly appreciated. TIA

2 1

Firewall with SuSE 6.2
by Jochen Mader 10 Oct '99

10 Oct '99

I'm using SuSE 6.2 with the firewall package version 2.2 and decided to set up a firewall to protect our servers because of the growing number of portscanns and attacks showing up in my logs. I'm totally new to that whole thing and I just don't get it what's wrong. I got an internal net (192.168.0.0/24) and an external net (*.*.*.128/28), they are connected through masquerading (works fine). The thing I'm trying to do is to set up another box protecting the external net. The problem is that I got a router (*.*.*.129) stting in that external net which is handling the connections to the internet, so I have to let all the traffic of the router pass through the firewall. According to the documentation it should be no problem as it is exactly the thing mentioned at the end of it.. So I set up a test-network with 3 PCs that resembles the real network the firewall is supposed to protect: I'M NOT FIREWALLING ANY PORTS NET-MASK: 255.255.255.240 *.*.*.129 (router) | | *.*.*.130 (eth1 on the firewall) *.*.*.131 (eth0 on the firewall) | | *.*.*.132 (a www-server, gateway set to *.*.*.131) IP_FORWARDING is enabled. Everything is running fine. the www-server is able to ping the firewall (both devices), but it is nit able to ping the router nor is the firewall and all packages coming from the router are dropped due to the spoof-protection. Now I set FW_ROUTER in rc.config to *.*.*.129. I thought that from now on I should be able to ping the router from the www-server (or was I wrong) or from the firewall. But when I started a ping from the firewall or the www-server they don't get any reply. Now when I start a ping from the router to the firewall or the www-server they also don't return, but I get a log entry that the packages have been accepted. Please help me, cause I got no idea of what I'm doing wrong.

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Re: [suse-security] SuSE 6.2: XDM/KDM login is world accessable
by Dirk Boehm 10 Oct '99

10 Oct '99

Hi *! KDM/XDM's shutdown prooerties can be set in YAST's login configuration - simply choose "local", so only a user sitting in front of your machine can do a shutdown. Other Options - like root, all (not so wise) or none - are also available. So this should not not be a problem - if it is wanted to use the KDM/XDM-login from a remote host. If not, the safest way is to deny any remote KDM/XDM-login as indicated. - Dirk -- Dipl.-Ing. Dirk Boehm Institut fuer Biotechnologie der TU-Graz fon +43+316+873-8415 Petersgasse 12 A-8010 Graz fax +43+316+873-8434 email: boehm(a)biote.tu-graz.ac.at PGP-Key available mail private: dirk.boehm(a)gmx.net

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SuSE 6.2: XDM/KDM login is world accessable
by Mark Lutz 10 Oct '99

10 Oct '99

I was browsing the German version of SuSE's support database (sdb) by versions and noticed an articel called "XDM/KDM Login ist weltweit zugänglich" <http://sdb.suse.de/sdb/de/html/cg_xdmcp.html>. Since this wasn't on this list (I think), I tried to get the English version of the articel. But strange enough it does not exist. Well, it probably has not been translated but I am sure you'll figure out what to do (just place an exclamation mark in front of the asterisk on those two lines, rephrase the comments and restart xdm/kdm) Thought, I'd let you know.

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masquerading & firewalling
by l41484＠alfa.ist.utl.pt 05 Oct '99

05 Oct '99

Has anyone been able to use masquerading & firewalling scripts that appeared on suse 6.2 (6.1??). I've configure MSQ_* variables on yast and then issued /etc/rc.d/masquerade the script runs, but NO masquerading is active. (for example /etc/rc.d/masquerade status shows empty masquerading rules). I don't want start learning ipchains now, since it will be once again discontinueted (SP?) on kernel 2.4 :-) Thanks. -- Tiago Pascoal (l41484(a)alfa.ist.utl.pt) FAX : +351-1-7273394 Politicamente incorrecto, e membro (nao muito) proeminente da geracao rasca. Recem empossado (engajado) cidadao da republica das bananas. Stewart's Law of Retroaction: It is easier to get forgiveness than permission.

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SuSE Security Announcement - mirror
by Marc Heuse 04 Oct '99

04 Oct '99

-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: mirror-2.8.f4 Date: Fri Oct 01 22:21:15 MEST 1999 Affected: all Linux distributions using mirror <= 2.8.f4 _____________________________________________________________________________ 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 that we provide this information on as "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 mirror package is a tool to duplicate the contents of ftp servers. A vulnerability exists when attackers can create directory like " .." on the target mirror ftp server. 2. Impact Files can be created one level above the local target directory for the mirrored files. 3. Solution Update the mirror package. See below. ______________________________________________________________________________ Here are the md5 checksums of the upgrade packages, please verify these before installing the new packages: eaccdb63f04bd93fbed398103230d962 mirror-2.8.f4-89.i386.rpm (SuSE 5.3) b2830062371f924dedc12176d51ee01f mirror-2.8.f4-89.i386.rpm (SuSE 6.1) f196641d03d95fd0ed5352787ba2b323 mirror-2.8.f4-89.alpha.rpm (SuSE AXP) 3ede055671a41481f9296d94ec577bd5 mirror-2.8.f4-89.i386.rpm (SuSE 6.2) ______________________________________________________________________________ You will find the update on our ftp-Server: ftp://ftp.suse.com/pub/suse/i386/update/5.3/n1/mirror-2.8.f4-89.i386.rpm ftp://ftp.suse.com/pub/suse/i386/update/6.1/n1/mirror-2.8.f4-89.i386.rpm ftp://ftp.suse.com/pub/suse/axp/update/6.1/n1/mirror-2.8.f4-89.alpha.rpm ftp://ftp.suse.com/pub/suse/i386/update/6.2/n1/mirror-2.8.f4-89.i386.rpm Webpage for patches: http://www.suse.de/patches/index.html or try the following web pages for a list of mirrors: http://www.suse.de/ftp.html http://www.suse.com/ftp_new.html ______________________________________________________________________________ SuSE has got two free security mailing list services to which any interested party may subscribe: suse-security(a)suse.com - moderated and for general/linux/SuSE security discussions. All SuSE security announcements are send to this list. suse-security-announce(a)suse.com - SuSE's announce-only mailing list. Only SuSE's security annoucements are sent to this list. To subscribe, just send an emtpy message to suse-security-subscribe(a)suse.com or suse-security-announce-subscribe(a)suse.com like this: echo | mail suse-security-subscribe(a)suse.com or echo | mail suse-security-announce-subscribe(a)suse.com ______________________________________________________________________________ If you want to report *NEW* security bugs in the SuSE Linux Distribution please send an email to security(a)suse.de or call our support line. You may use pgp with the public key below to ensure confidentiality. ______________________________________________________________________________ This information is provided freely to everyone interested and may be redistributed provided that it is not altered in any way. 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Re: port sentry
by Gregory Conron 03 Oct '99

03 Oct '99

On Sun, 03 Oct 1999, you wrote: > Please can you tell me where to get "Port Sentry" you mentioned in > "suse-security"? http://www.psionic.com/abacus/portsentry/ It's part of the Abacus Project suite of security tools. Cheers, GC -- Gregory Conron gconron(a)hfx.andara.com - email (902) 443-4562 - voicemail

1 0

Firewalls again
by Thomas Stahl 03 Oct '99

03 Oct '99

Hello all! I lately installed a firewall on my SuSe 6.2 Box, to protect our corporate network. The firewall runs almost as supposed, but i have a speed problem with network traffic, since the firewall is up. At the moment http and ftp is forwarded to a local proxy. This works great and with almost the same performance as without an firewall. The problems are other services, for example a telnet-session to the firewall (yes, i know i schould be using ssh. --working on it!) needs about 20 seconds ( 2 secs before firewall) to connect. The same problem exists for pop3, smtp- and domain-services. These rules are always confgured as an input and an output rule, no forwarding is done on any ports. Maybe i have just not compiled the kernel features in the right way? Or is the ruleset more complicated? Has anybody a solution for this problem by now, or is more "input" needed? Thanks! Thomas

2 1

i need help !
by Michael 03 Oct '99

03 Oct '99

somebody crcked my system with evil icmp against and l22dos.linux_x8 what shell i do thanks michael

3 2

Help evil icmp
by Michael Hülsmann 02 Oct '99

02 Oct '99

i need help. somebody installed the several programs. evil icmp.cpp icmp l22dos.linux_x8 against what shell i do ? thanks for any regards michael

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openSUSE Security October 1999