openSUSE Security October 2002

security@lists.opensuse.org

166 participants
178 discussions

how to keep nimda and code red from filling apache logs

by Mathias Homann

Hi all, here's a bit of a step-by-step description on how to keep nimda and codered from filling your apache logs. Parts used: - SuSE 7.2 Professional - SuSEfirewall2 - iptables 1.2.3 - linux kernel 2.4.13-pre5 steps: 1. install kernel sources for a kernel >> 2.4.9, running 2.4.13- pre5 here, works fine so far 2. get the sources for iptables 1.2.3 from http://netfilter.samba.org 3. unpack sources somewhere 4. export KERNEL_DIR=$(where you put the kernel tree) 5. cd into unpacked iptables sources, there's a subdirectory named patch-o-matic there 6. apply wanted patches by running ./runme $(name.of.patch)patch for this here You'll want the string patch You can also apply other patches, like the irc-conntrack patch 7. now there's a little bug in this patch... here's a diff: --- linux/net/ipv4/netfilter/ipt_string.c~ Sun Oct 21 00:16:29 2001 +++ linux/net/ipv4/netfilter/ipt_string.c Sun Oct 21 16:54:45 2001 @@ -62,7 +62,7 @@ sk = skip[haystack[right_end - i]]; sh = shift[i]; - right_end = max(int, right_end - i + sk, right_end + sh); + right_end = max(right_end - i + sk, right_end + sh); } return NULL; 8. now, make config/menuconfig/xconfig... as usual. You can import your running kernel's config first. 9. enable the experimental stuff 10. go to networking options->netfilter, there's an option there to enable string matching; set that to M 11. compile and install kernel as usual; remember to uncomment the export INSTALL_PATH=/boot in the main makefile. 12. now build a rpm file for the new iptables stuff by installing the source rpm which comes with suse, then edit the spec file, put the iptables source in /usr/src/packages/SOURCE and rebuild. 13. now there are some small changes to the firewall config files. a) uncomment the last line in /etc/rc.config.d/firewall2.rc.config: FW_CUSTOMRULES="/etc/rc.config.d/firewall2-custom.rc.config" b) edit that file, I got the following stuff in mine: for forbidden_string in root.exe cmd.exe .ida; do iptables -I input_ext -p tcp --dport http -m string \ --string $forbidden_string -m state \ --state ESTABLISHED -j REJECT --reject-with tcp-reset done put that in the last supfunction defined in the custom rc file. c) change the FW_LOG setting in firewall2.rc.config from reading -log-level warning to -log-level kernel.warning 14. last: some small changes to /sbin/SuSEfirewall2 search in the script for the parts where the modules are loaded and unloaded; be sure to add ipt_string (and the other new modules you created by patching the kernel and enabling them in make config) to the modules loading/unloading code there. 15. reboot 16. if you try now to access (from outside, of course) one of the nimda or codered URLS, all you get is a 'connection reset by peer', and the request doesn't show in apache log files. btw, no guarantees, and the usual YMMV :) bye [L]

18 years, 9 months

suse samba server

by jonathan

Hello I have basically a suse samba server setup. Eth0 is for the internet connection (cable). Eth1 is my internal network. I use eth1 for my samba server. When i have the shares/ drive letters mapped, whatever, Ill goto access them and that computer will just lockup or timeout for about 1 minute, then it will resume operation normally. I have approx. 5 comptuers on the suse server, and they all do this from windows xp to windows 98se. I am using set up addresses of 192.168.0.x, where is greater than 2. My question is have or is there something Ive setup wrong to cause this pause to occur. ? Its becomming very annoying..and frustrating. Im using kernel 2.4.18-64GB-SMP with a dual processor setup. If anyone has any ideas please let me know. Every package installed is orginal versions from the suse install cdroms. (no updates done). Anything come to mind. btw, ive replaced the switch, with a new netgear one, and all the networks at startech ST100 Realtek 8139 chipsets on 100Tx. Anyone... !

19 years, 5 months

Urgggggg!!! SuSEFirewall2 is getting on my nerves!!!!!

by Chris Bek

Hi there SuSErs... Well I must be doing something really wrong because everything that I do with SuSEFirewall2 is just not working! I have a small network with 5 PCs (all Win9X) and a Linux box (Currently SuSE 7.3) acting as a server. The server is a DHCP server and a Samba server for the entire network. So far everything is working perfect!!! Users log on the network, logon script executes etc.... Then a new task came up: let's input the internet into the network. Configured a 56Kbps modem on the server with YAST. Manged to get my account setup and running. Made a test connection and netscape works great on the server as well as e-mail (pop3). I tried configuring SuSEfirewall to manage all incoming requests from the PCs of the network. The firewall warned me about masquerading etc. so I downloaded the latest version of SuSEfirewall2 from the internet and installed it. Since I only need direct masquerading to be done (no proxies are currently working on the net) I made all the necessary changes as outlined in the examples supplied with the software. Since I needed to have Samba to keep working on the network, I opened (among others) 139 port for samba to work. Double checked all the changes that I have made and run rcSuSEfirewall2 to see what happens. Strange enough when wvdial executes it tells me that DNS is not functioning properly since www.suse.com cannot be found (or something like that please forgive me I am away from the Linux station now). Further on, when I open mIRC or other like programs (winmx etc) from a station, I look at the activity of IPtraf (I check this to see what happens) and I see no connections being created whatsoever.... mIRC prompts me that there was an error trying to find the host.... I have made no changes to the Win9X PCs. Is there something that I am forgeting to do?? I undestand that it is impossible for all of you to react to this since I have no output of the SuSEfirewall.conf file being published to this message.... I understand. Can someone please send me their configuration file so I can see what you have done, on a system that currently is working fine?? In addition, is there something that I have to do regarding route or routing?? What about the Win9X PCs?? Is there something that I have to do there?? I thank you so very much for all your help is advance!!!! I am killing myself trying to figure this one out for about 2 weeks now and managed nothing more than thin air!!!!! Chris

19 years, 5 months

SSH Authentication

by Joao Reis

Hi! I implemented a ssh conection from the outside to my intranet. This ssh requires a username and a password. In terms of security what is more secure: require authentication (username and password) or having the public key of each user that connects to our intranet in the authorized public key lists (in this case there is no need for username and password)? In the second case there is no need of authentication and only the users wich have the public keys in the list are allowed to enter in my intranet. This second solution is a good solution or that brings other security problems ? Thanks. -- Farewell. "Keep your friends close, but your enemies closer." "Do or do not. There is no try" - Yoda João Reis -------------------------------------------------------

19 years, 7 months

Problems with bastille

by Bonemach

Hi, I've installed SuSE 8.1 and I'm trying to harden the system. I also found that there is a Bastille for SuSE that can be installed. So I installed Bastille and ran InteractiveBastille -c After answering all the questions asked, Bastille promises to execute the configuration yet nothing happens. Now what ?!? How do I get that damn Bastille stuff executed, or should I revert to hardensuse ? greetings Bone Machine --- "An here head has no room" - The Pixies ---

19 years, 8 months

netfilter nat bug; suse 8.0 kernel affected?

by Mathias Homann

Hi, just found http://www.netfilter.org/security/2002-04-02-icmp-dnat.html Do I need to worry? Running 2.4.18 suse stock kernel on a 8.0 pro. bye, MH -- Die unaufgeforderte Zusendung einer Werbemail an Privatleute verstößt gegen §1 UWG und §823 I BGB (Beschluß des LG Berlin vom 2.8.1998 Az: 16 O 201/98). Jede kommerzielle Nutzung der übermittelten persönlichen Daten sowie deren Weitergabe an Dritte ist ausdrücklich untersagt!

19 years, 8 months

identd

by fin

Could someone tell me how to switch off identd in 8.1? I tested my firewall at www.grc.com and all of my ports are in stealth mode except identd, which is closed but still visible. As it is a potential source of information and only used for irc, which I don't need, I'd like to get rid of it. I found several articles on the web concerning this problem, but they are all for earlier versions and suggest shutting the service in etc/rc.config or etc/services, none of which exist in 8.1. I can't find anything in the new etc/sysconfig. How can I shut identd down? Fiona

19 years, 8 months

heartbeat update broken ??

by Dan Am

Hi Guys, had to dabble in HA, and it drove me around the pole when the failover node would not come up. I turned on debugging and got somthing about "symbol not defined in libpils.so" . I reinstalled from disk, which overwrote the YOU Security update and voila, the thing works. So: Careful with taht update,it may render your installation unusable. SuSE chaps, can you have a look, unfortunately I not a great C-Programmer. Are ther any other expoeriences with that ? Regards Dan

19 years, 8 months

SuSE Security Announcement: lprng/html2ps (SuSE-SA:2002:040)

by Sebastian Krahmer

-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: lprng, html2ps Announcement-ID: SuSE-SA:2002:040 Date: Thu Oct 31 11:00:10 MET 2002 Affected products: 7.0, 7.1, 7.2, 7.3, 8.0, 8.1 SuSE eMail Server III, 3.1 SuSE Firewall on CD/Admin host SuSE Firewall on CD 2 SuSE Linux Connectivity Server SuSE Linux Enterprise Server 7 SuSE Linux Office Server Vulnerability Type: local privilege escalation, remote command execution Severity (1-10): 6 SuSE default package: yes Cross References: - Content of this advisory: 1) security vulnerability resolved: Local privilege escalation in runlpr (from lprng package) and remote command execution via html2ps printfilter. problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information The lprng package contains the "runlpr" program which allows the lp user to execute the lpr program as root. Local attackers can pass certain commandline arguments to lpr running as root, fooling it to execute arbitrary commands as root. This has been fixed. Note that this vulnerability can only be exploited if the attacker has previously gained access to the lp account. Additionally, the html2ps printfilter, which is installed as part of the LPRng print system, allowed remote attackers to execute arbitrary commands in the context of the lp user. These two issues combined allow attackers to mount a remote root attack. As a workaround, we recommend to uninstall the html2ps package, and restrict access to your print services to authorized hosts only. Access control to lpd is implemented by adding appropriate entries to the /etc/lpd.perms file. Please consult the lpd.perms(5) manpage, or add the single line DEFAULT REJECT to your /etc/lpd.perms file to deny access to everyone from the outside. 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. i386 Intel Platform: SuSE-8.1 ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/html2ps-1.0b3-458.i586… c1990d8139e33176fb02745f3e5b0a05 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/html2ps-1.0b3-458.src.r… f42f18d885dc2fe5701bc74812fd6ceb ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/lpdfilter-0.43-63.i586… cc79a87fd8fcc9cf92356ab4863babc6 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/lpdfilter-0.43-63.src.r… 0ad433931936c4ba5a644de9104b3db4 SuSE-8.0 ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra1/html2ps-1.0b3-456.i386.rpm c14c59d1f23575841a95f7d5eaf6f734 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/html2ps-1.0b3-456.src.rpm 7ffd5b01e399ee427a0d3a16d15af4f1 ftp://ftp.suse.com/pub/suse/i386/update/8.0/ap1/lpdfilter-0.42-155.i386.rpm dd04dd60c4c18b5711643f6334b97bfd source rpm: ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/lpdfilter-0.42-155.src.rpm 4d6b611c572d251f47c0b4cf8ab7a28d SuSE-7.3 ftp://ftp.suse.com/pub/suse/i386/update/7.3/gra1/html2ps-1.0b3-457.i386.rpm 28a1aee8dfedfff3eb348fc4ea4a8876 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/html2ps-1.0b3-457.src.rpm 2765c61e39616199cbf5066d719280b3 SuSE-7.2 ftp://ftp.suse.com/pub/suse/i386/update/7.2/gra1/html2ps-1.0b1-432.i386.rpm 1ab553d151c65505184353ae6e514db6 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/html2ps-1.0b1-432.src.rpm b71dba7782caeb01954b418e3ffdd6c2 SuSE-7.1 ftp://ftp.suse.com/pub/suse/i386/update/7.1/gra1/html2ps-1.0b1-431.i386.rpm 1d9adfc7cc1e141f340b844f040bfe85 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/html2ps-1.0b1-431.src.rpm b1b29ff154fc13cb806dec49fc00ff81 SuSE-7.0 ftp://ftp.suse.com/pub/suse/i386/update/7.0/gra1/html2ps-1.0b1-428.i386.rpm 7e0bd236c647cd70ba9b0274f7b5cf53 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/html2ps-1.0b1-428.src.rpm b60e012d057e428e6ade468d46afd4e5 Sparc Platform: SuSE-7.3 ftp://ftp.suse.com/pub/suse/sparc/update/7.3/gra1/html2ps-1.0b3-88.sparc.rpm b6c1c7399a041477ce0c321a9eda383b source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/html2ps-1.0b3-88.src.rpm 8102e2145e43fb6486cee5ccfc106c67 AXP Alpha Platform: SuSE-7.0 ftp://ftp.suse.com/pub/suse/axp/update/7.0/gra1/html2ps-1.0b1-328.alpha.rpm 83967dc5d7dcf672c6dd902c125a3e81 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/html2ps-1.0b1-328.src.rpm e3851c0f69017811168213a707431467 PPC Power PC Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/ppc/update/7.1/gra1/html2ps-1.0b1-303.ppc.rpm b9cb5de37503927812f767a0781bfc6a source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/html2ps-1.0b1-303.src.rpm be58c62e270d5cbc2aa3395beae91009 SuSE-7.0 ftp://ftp.suse.com/pub/suse/ppc/update/7.0/gra1/html2ps-1.0b1-302.ppc.rpm a98f5628ae1068b3d7f20b83ace9bb77 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/html2ps-1.0b1-302.src.rpm 5a425dbc64f2e0f2a368ecb566c624eb ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: There is no additional information this time. ______________________________________________________________________________ 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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19 years, 8 months

iptables TTL target

by mailinglists＠belfin.ch

Hi this is my problem: + iptables -t mangle -A PREROUTING -i eth1 -j TTL --ttl-inc 1 iptables: No chain/target/match by that name modprobe ipt_ttl is in my script. But this does only match ttl targets. According to http://cert.uni-stuttgart.de/archive/usenet/comp.os.linux.security/2002/08/m sg00458.html there should be two ttl modules in /lib/modules/2.4.18-4GB/kernel/net/ipv4/netfilter/. ipt_TTL for the target ipt_ttl for matching. ipt_TTL isnt in the modules directory. How am I going to get this to work? Thanks, Philipp

19 years, 8 months

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openSUSE Security October 2002