January 2003 - openSUSE Security - openSUSE Mailing Lists

Re: [suse-security] Router vs Software Firewall
by Richard Barrington 23 Jan '03

23 Jan '03

It depends somewhat on the model, I expect. Why not run Nessus or similar against your network and see what gets though? Are you running a hub or a switch? You might want to set you tools up to listen on all 3 machines to see what's happening. Ultimately, it depends how paranoid you want to be :-) We're running a dedicated OpenBSD gateway box (eg 2 nics - 1 in and 1 out), proxying to the web and email servers. You can have a lot of the useful features when you roll your own firewall, eg ad-blocking, spam-filtering, web caching, decent logging, and so on. Having said that, if reasonably set-up, SuSE firewall should be plenty good enough in a basic scenario - I was running it for about a year with no break-ins (that i know of ;-) although plenty of scans and so on were logged), and that was with a DSL modem with some ports opened on it. I would also consider using vsftp as an alternative ftp server. http://vsftpd.beasts.org/ >This may be a silly question, but if you are using a broadband cable/dsl >router does that not work as a firewall? The one I have does not allow >for state-full packet filtering, but with port forwarding and other >various security options enabled could this replace having a firewall on >each desktop? I have 3 machines connecting through this router which >also links the internal network. 1 machine is running Windows XP Pro >with Zonealarm and the built in firewall up and running. The other is a >project gentoo box and my rig is a dual-boot winxpro and SuSE 8.1 box. I >have the suse firewall up and running on my box and I'm not sure if that >by itself is good enough. I want to get pure-ftp up and running on it >and I am concerned about my security.

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susefirewall2 - mit client klappt ping, mit server nicht .
by KaiU＠gmx.de 22 Jan '03

22 Jan '03

Hallo, und auf der text console werden ungefähr 1.000.000 xxx.kernel : SUSE-FW-ILLEGAL-TARGET IN=ippp0 out= MAC= SCR=212.185.253.70 DST=217.0.61.1 gezeigt. Nach dem update von susefirewall2 mit YOU komme ich jetzt mit dem client ins Internet. Der Server ping vom server geht nach dem booten geht auch raus. Jedoch - trennt sich der server vom netz, (ich vermute dail-on-demand) kann ich per client immer noch ins netz, der server hat jedoch kein netzzugriff mehr. Auf der Console (Strg-Alt-F10) wird bei jedem packet xxx.kernel : SUSE-FW-ILLEGAL-TARGET IN=ippp0 out= MAC= SCR=212.185.253.70 DST=217.0.61.1 ... PROTO=ICMP.... gezeigt. Seltsam :-)))))) Kann mir jemand weiter helfen ? Kai

1 1

Needed an example script
by mike wilsher 22 Jan '03

22 Jan '03

This may help in my effort; Does anyone have working scripts for SuSEfirewall2 and SuSEfirewall2-custom files for SUSEFirewall2 for the following basic setup or something close to it... One Static internet address -PASS DNS to Workstation -Host a web server on the internal private lan -Workstation that can surf/play in the internet If you have the above setup please send or post it. So that I can build off of it. Also I am runnning SUSE 8.0 with but I will likely upgrade to 8.1. Thanks in advance Mike Wilsher - Unix/Security/Disaster Recovery PGP = 5E 1C 46 C6 0A 49 FF A6 94 72 2C FA D3 C6 1C 28 9D DF 7E EB NIHRC KC5BOD

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susefirewall2 - server geht nur zeitweilig online, firewall startet langsam
by KaiU＠gmx.de 22 Jan '03

22 Jan '03

Hallo, Ich habe folgende probleme, kennt jemand diese phänomene mit susefirewall2 ? 1. Die initialisierungsphase 2 dauert während des bootens ewig, (beim booten kommt kommt folgende message : ... Warning could not set up default route via interface ippp0/eth0... ... Error by executing : command 'ip routr replace 192.168.0.2 via 192.168.0.1... und auf der text console werden ungefähr 1.000.000 xxx.kernel : SUSE-FW-ILLEGAL-TARGET IN=ippp0 out= MAC= SCR=212.185.253.70 DST=217.0.61.1 gezeigt. 2. Nach dem update von susefirewall2 mit YOU komme ich jetzt mit dem client ins Internet. Der Server ping vom server geht nach dem booten geht auch raus. Jedoch - trennt sich der server vom netz, (ich vermute dail-on-demand) kann ich per client immer noch ins netz, es ist jedoch kein netzzugriff mehr. :-)))))) Kann mir jemand weiter helfen ? Kai

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Re: [suse-security] Hi, just signed up
by GentooRulez 22 Jan '03

22 Jan '03

>even though i miss >Windows, alot of tools i used for web design only run under that Try wine to use such tools with your linux desktop. Another idea is a virtual machine with vmware, the is a free solution for that too, but i cant recall it's name. >firewall Check things like squid ftp-proxy openwall harden_suse rbacl kernel modul/patch snort ntop ijb for security related software Michael

2 1

Help needed with susefirewall2
by mike wilsher 22 Jan '03

22 Jan '03

I have SUSE 8.0 and am running SuSEfirewall2 and I have the below setup; ---------------------- | | | DSL Modem | | | ---------------------- | | ---------------------- | | | HUB | | | ---------------------- | | ---------------------- |eth1 eth2 | | | | SuSE Firewall2 | | | | | | eth0 | ---------------------- | | ---------------------- | | | HUB | | | ---------------------- | | | | | | | | | | | | | | L_______ workstation_a WEB1 | | | x.x.x.30 x.x.x.6 | | L_________ workstation_b | | x.x.x.31 WEB2 | x.x.x.7 | | Mail1/ftp1/scp1 x.x.x.8 IP Addresses; eth1 and eth2 are ISP assigned STATIC addresses. I need to permit the exchange of DNS services to my internal machines Internal addresses are 192.168.0.x What I want to do; web traffic on eth1 needs to go to web1 ( port 80 httpmhttps) my work web server pop, ftp and scp traffic on eth1 needs to Mail1/ftp1/scp1 web traffic on eth2 needs to go to web2 ( port 80 http,https) my other web server the workstation_a and workstation_b both shoudl be able to surf the net as well as access the internal pop as well as access external pop as well as any other internet based service. So what the heck do I need to do to my SuSEfirewall2 and SuSEfirewall2-custom files? Any help out there? Thanks. -- Mike Wilsher - Unix/Security/Disaster Recovery PGP = 5E 1C 46 C6 0A 49 FF A6 94 72 2C FA D3 C6 1C 28 9D DF 7E EB NIHRC KC5BOD

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PuTTY tells me "Software caused connection abort" if I start the DSL connection.
by ce-em 22 Jan '03

22 Jan '03

Hi all, I've searched the last 2 days for a solution, but found nothing. So I try it here. I've set up a "normal" HomeLAN with a Linux Gateway (SuSE 8.1) and several Windows Clients. The Linux Box has the following ethernet devices: eth0 -- 192.168.0.1/24 -- connected to LAN eth1 -- 192.168.1.100/24 -- connected to DSL Modem The sofware I use are (all shipped with SuSE): smpppd cineternet iptables SuSEfirewall2 First, the connection from the gateway and the clients (over masquerading) to the internet works fine and fast. I can dial in and out. Ok, now my problem. To dialin or out I connect to the gateway using PuTTY as ssh client. (I have configured the firewall to accept ssh --> FW_SERVICES_INT_TCP="ssh") The connect works, so I can start the dialin with #> cinternet --start Now it happens... After a few seconds my PuTTY session don't react on my input and after some more time I get a POPUP telling me: "Software caused connection abort". Then I have to wait till the dialin process has finished. Then I can start a new PuTTY session to the gateway. I think it must be the firewall who disconnects me, because if I restart the firewall without dialin in, my PuTTY session just hangs about 2 seconds. But if I am dialed in (so my ppp interface is up) and I restart the firewall, the "connection abort" error occours again. Thanks for your help. Christian

4 6

SuSE Security Announcement: cvs (SuSE-SA:2003:0007)
by Thomas Biege 22 Jan '03

22 Jan '03

-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: cvs Announcement-ID: SuSE-SA:2003:0007 Date: Wednesday, Jan 22th 2003 08:30 MET Affected products: 7.1, 7.2, 7.3, 8.0, 8.1 SuSE Linux Database Server SuSE eMail Server 3.1 SuSE eMail Server III SuSE Firewall Adminhost VPN SuSE Linux Admin-CD for Firewall SuSE Firewall on CD 2 - VPN SuSE Firewall on CD 2 SuSE Linux Enterprise Server 7 SuSE Linux Connectivity Server SuSE Linux Enterprise Server 8 SuSE Linux Office Server Vulnerability Type: remote system compromise Severity (1-10): 3 SuSE default package: no Cross References: CAN-2003-0015 Content of this advisory: 1) security vulnerability resolved: - double free() - removed dangerous features problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - libmcrypt - gfxboot - mod_php4 - wget - IMP 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information CVS (Concurrent Versions System) is a version control system which helps to manage concurrent editing of files by various authors. Stefan Esser of e-matters reported a "double free" bug in CVS server code for handling directory requests. This free() call allows an attacker with CVS read access to compromise a CVS server. Additionally two features ('Update-prog' and 'Checkin-prog') were disabled to stop clients with write access to execute arbitrary code on the server. These features may be configurable at run-time in future releases of CVS server. There is no temporary fix known other then disable public access to the CVS server. You do not need to update the cvs package as long as you need 'Update-prog' and 'Checkin-prog' feature and work in a trusted environment. Otherwise install the new packages from our FTP servers please. Please download the update package for your distribution and verify its integrity by the methods listed in section 3) of this announcement. Then, install the package using the command "rpm -Fhv file.rpm" to apply the update. Our maintenance customers are being notified individually. The packages are being offered to install from the maintenance web. Intel i386 Platform: SuSE-8.1: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cvs-1.11.1p1-235.i586.… 39c4b7d43dbfed5dbc4e1cff6703929d patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cvs-1.11.1p1-235.i586.… c8986430a0f01c0ccc7fd2795769cb42 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/cvs-1.11.1p1-235.src.rpm 7aaa5bbd5740f0645307e905faddb748 SuSE-8.0: ftp://ftp.suse.com/pub/suse/i386/update/8.0/d3/cvs-1.11.1p1-235.i386.rpm e575a12fed87ff0bfb0fb4a62d720ce6 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/d3/cvs-1.11.1p1-235.i386.patch.… 97c13a4d400c28dbbbbf4f1b65f11ec7 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/cvs-1.11.1p1-235.src.rpm c977c2986c677e8489f5170fcef96945 SuSE-7.3: ftp://ftp.suse.com/pub/suse/i386/update/7.3/d2/cvs-1.11-230.i386.rpm 0b68cab2f1d7f01570932789c0ec6719 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/cvs-1.11-230.src.rpm 35ab94986627b96962bada1fc9998b88 SuSE-7.2: ftp://ftp.suse.com/pub/suse/i386/update/7.2/d2/cvs-1.11-231.i386.rpm 56933c0d5cb7d5e3c419dcfde9f4359f source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/cvs-1.11-231.src.rpm f997358538750a4fe856e4ef08c9282a SuSE-7.1: ftp://ftp.suse.com/pub/suse/i386/update/7.1/d2/cvs-1.11-230.i386.rpm e268ef72120bbe32dd8f9de2a147cd35 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/cvs-1.11-230.src.rpm 6cbbdc648d0f92fb9bdaef0768393596 Sparc Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/d2/cvs-1.11-103.sparc.rpm d844d36f87a1314c5e9e0cef0c5c5e74 source rpm(s): ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/cvs-1.11-103.src.rpm 156571c1dffc05ecab860311397c71c6 AXP Alpha Platform: SuSE-7.1: ftp://ftp.suse.com/pub/suse/axp/update/7.1/d2/cvs-1.11-106.alpha.rpm 674d08dd948ec15f3b7bb9a6efbbf802 source rpm(s): ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/cvs-1.11-106.src.rpm 65329bf424c02268d6b6c93a351f816c PPC Power PC Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/d2/cvs-1.11-115.ppc.rpm 3bbc332aa35da69e6fcaa60c4f085e72 source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/cvs-1.11-115.src.rpm e0fbe772152cb24a0d0ee2921432d89d SuSE-7.1: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/d2/cvs-1.11-115.ppc.rpm fdcdabeaf8be8cd78ac8ddab2d17cf61 source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/cvs-1.11-115.src.rpm e58e5376fccfd6d00abbe1187b813e78 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - libmcrypt Several buffer overflows in libmcrypt were discovered by Ilia Alshanetsky. The buffer overflows can lead to system compromise. New packages are currently being build. - gfxboot Since SuSE 8.1 the bootloader lilo is replaced by grub. Grub's password authentication can be bypassed. New packages will be released soon. - mod_php4 A buffer overflow in the wordwrap() function has been reported. New packages will be prepared and should be available on our ftp servers soon. - wget A buffer overflow in wget's url_filename function was found. This buffer overflow can be triggered by long URLs. New packages are currently being build and will be released soon. - IMP The web front-end of IMP is vulnerable to a SQL injection attack. New packages are currently being build and will be released soon. ______________________________________________________________________________ 3) standard appendix: authenticity verification, additional information - Package authenticity verification: SuSE update packages are available on many mirror ftp servers all over the world. While this service is being considered valuable and important to the free and open source software community, many users wish to be sure about the origin of the package and its content before installing the package. There are two verification methods that can be used independently from each other to prove the authenticity of a downloaded file or rpm package: 1) md5sums as provided in the (cryptographically signed) announcement. 2) using the internal gpg signatures of the rpm package. 1) execute the command md5sum <name-of-the-file.rpm> after you downloaded the file from a SuSE ftp server or its mirrors. Then, compare the resulting md5sum with the one that is listed in the announcement. Since the announcement containing the checksums is cryptographically signed (usually using the key security(a)suse.de), the checksums show proof of the authenticity of the package. We disrecommend to subscribe to security lists which cause the email message containing the announcement to be modified so that the signature does not match after transport through the mailing list software. Downsides: You must be able to verify the authenticity of the announcement in the first place. If RPM packages are being rebuilt and a new version of a package is published on the ftp server, all md5 sums for the files are useless. 2) rpm package signatures provide an easy way to verify the authenticity of an rpm package. Use the command rpm -v --checksig <file.rpm> to verify the signature of the package, where <file.rpm> is the filename of the rpm package that you have downloaded. Of course, package authenticity verification can only target an un-installed rpm package file. Prerequisites: a) gpg is installed b) The package is signed using a certain key. The public part of this key must be installed by the gpg program in the directory ~/.gnupg/ under the user's home directory who performs the signature verification (usually root). You can import the key that is used by SuSE in rpm packages for SuSE Linux by saving this announcement to a file ("announcement.txt") and running the command (do "su -" to be root): gpg --batch; gpg < announcement.txt | gpg --import SuSE Linux distributions version 7.1 and thereafter install the key "build(a)suse.de" upon installation or upgrade, provided that the package gpg is installed. The file containing the public key is placed at the top-level directory of the first CD (pubring.gpg) and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de . - SuSE runs two security mailing lists to which any interested party may subscribe: suse-security(a)suse.com - general/linux/SuSE security discussion. All SuSE security announcements are sent to this list. To subscribe, send an email to <suse-security-subscribe(a)suse.com>. suse-security-announce(a)suse.com - SuSE's announce-only mailing list. Only SuSE's security announcements are sent to this list. To subscribe, send an email to <suse-security-announce-subscribe(a)suse.com>. For general information or the frequently asked questions (faq) send mail to: <suse-security-info(a)suse.com> or <suse-security-faq(a)suse.com> respectively. ===================================================================== SuSE's security contact is <security(a)suse.com> or <security(a)suse.de>. The <security(a)suse.de> public key is listed below. ===================================================================== ______________________________________________________________________________ The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. In particular, it is desired that the clear-text signature shows proof of the authenticity of the text. SuSE Linux AG makes no warranties of any kind whatsoever with respect to the information contained in this security advisory. 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-----END PGP PUBLIC KEY BLOCK----- -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv iQEVAwUBPi7IRney5gA9JdPZAQFyRgf/Ys46ncc0yvtER/P5l7MYbeP3o/szoTCh RM8fWlaWC6ZbdOHm8AMFcnR8EzCzYRV4ks+ks6nspkgnEpVl8IF1SDJqt5npqWsu FPlsoTSt8duNrcfUpTlZldicauMTjltnnrTXpds6a5RihqH42pbLA9w2wivMe5KN EnP175YmgnRUDr2PWOvWJ6vMImrz5a7tjBJ5lyCd1vH4042+rhY9hIUTHeL3ZyfG hr+dgmN5LeBi04MWSXJxxIwdAmng18Y99Koa8p9lHeriU6WmcOqOpr2+qmp9oY8W Fx8Ft2sAPZLMvCuIuiTL/tFyaSZEvXtvtx11SbX4OLqlCt3z9yj2Zg== =28JU -----END PGP SIGNATURE----- Bye, Thomas -- Thomas Biege <thomas(a)suse.de> SuSE Linux AG,Deutschherrnstr. 15-19,90429 Nuernberg Function: Security Support & Auditing "lynx -source http://www.suse.de/~thomas/contact/thomas.asc | pgp -fka" Key fingerprint = 51 AD B9 C7 34 FC F2 54 01 4A 1C D4 66 64 09 83 -- Over thinking, Over analyzing, seperates the body from the mind. - Maynard James Keenan

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Fwd: Re: [suse-security] SuSefirewall2 with NAT for several servers.....
by Harald Wallus 22 Jan '03

22 Jan '03

On Monday 20 January 2003 20:26, Carlos Carrera wrote: > Hello friends, a question... Has somebody configured their SuSEfirewall2 > with several servants that have addresses IP you publish each one?, How > does the SuSEfirewall2 differentiate the packages that you/they go like > destination to one or another servers if in the variable alone > FW_FORWARD_MASQ the address source is placed, later the address private IP > of the server inside your LAN? > > thank you, I hope they respond me..... please. Look at this old mail, that is that what I'm using. I thing SuSE (Marc) have to make an opensource product from SuSEfirewal2. There are few enhencement which I use and which are of interrests for other users. my problem was that I have a box with three interfaces (ext, dmz, int) and many IPs on the ext-interface and one (or more) server in the dmz. In the moment the SuSEfirewall2 (v2.1) on my SuSE 8.0 installation can't do that (look in the TODO file). So I spend some time in patching the SuSEfirewall2 script and it works well for me. The patch is very small: 1310c1310,1311 < ERROR=`echo $NETS | $AWK -F, '{print $6}'` --- > DEST=`echo $NETS | $AWK -F, '{print $6}'` > ERROR=`echo $NETS | $AWK -F, '{print $7}'` 1337a1339 > test -z "$DEST" || DEST="-d $DEST" 1339c1341 < $IPTABLES -A PREROUTING -j DNAT -t nat $PROTO $NET1 $PORT1 --to-destination ${NET2}${PORT2} -i $DEV --- > $IPTABLES -A PREROUTING -j DNAT -t nat $PROTO $NET1 $PORT1 $DEST --to-destination ${NET2}${PORT2} -i $DEV Short description: - edit the test of the arguments of FW_FORWARD_MASQ and add the variable DEST for the IP adress on the firewall - add line for test the variable DEST, if set add '-d ' for later use in the iptables command - edit the iptables command for PREROUTING; added the DEST variable And the point 14 in /etc/sysconfig/SuSEfirewall2 gets a fifth argument: The IP adress on that the firewall listen on the ext-interface, e.g. a www-server: FW_FORWARD_MASQ="0/0,192.168.13.130,tcp,80,80,<public IP adress on ext-interface>" Warning: With that parameter file u can't start the unpachted SuSEfirewall2 script because it controlls how many arguments are given. btw. of cource you must configure the public IP adress on the firewall-box (/etc/sysconfig/network ...)! I test this config but maybe there are some points I can't see with my config... Comments are welcome... Greetings Kai This was from "Kai-H. Weutzing" <suse(a)exozet.com> at 2002-05-27. -- Dr. Harald Wallus netlike-gmbh Am Listholze 78, D-30177 Hannover Tel: +49(0)511 90 95 1-23 Fax: +49(0)511 90 95 1-90 Email: wallus(a)netlike-gmbh.de Internet: http://netlike-gmbh.de ------------------------------------------------------- -- Dr. Harald Wallus netlike-gmbh Am Listholze 78, D-30177 Hannover Tel: +49(0)511 90 95 1-23 Fax: +49(0)511 90 95 1-90 Email: wallus(a)netlike-gmbh.de Internet: http://netlike-gmbh.de

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Re: [suse-security] revocation of a pgp-key
by bliss＠attbi.com 22 Jan '03

22 Jan '03

It would be a little insecure if someone without any validating credentials could revoke a key. Jim > Bruno Leonhardt wrote: > > Hi , > > > > how do I delete or revoke a key from the key-server if I've lost the pass > > and have no revocation-cert ? > > no way :( You have to wait until the key expires... > > > > -- > Check the headers for your unsubscription address > For additional commands, e-mail: suse-security-help(a)suse.com > Security-related bug reports go to security(a)suse.de, not here >

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