June 2000 - openSUSE Security - openSUSE Mailing Lists

SuSeFirewall and DHCP
by Bob Berman 30 Jun '00

30 Jun '00

I have a question about setting up SuSEfirewall using /etc/rc.config.d/firewall.rc.config. I am pretty happy with the firewall, but I have been noticing in my logs what appears to be packets from my ISP's DHCP server (port 67) to my port 68. The packets seem to be being DENY'd and if that is the case, I don't know why. I set FW_SERVICE_DHCLIENT="yes", but this is what I'm seeing in the logs: Jun 29 19:40:37 telluride kernel: Packet log: input DENY eth0 PROTO=17 177.206.122.48:67 94.169.114.118:68 L=328 S=0x00 I=16105 F=0x4000 T=252 (#122) And to really confuse matters, if I test it with ipchains -C, it indicates it should be accepted!!! What is going on? [574][root@telluride:/var/log]$ ipchains -v -C input -p udp -s 177.206.122.48 67 -d 94.169.114.118 68 -i eth0 - udp opt ------ tos 0xFF 0x00 via eth0 177.206.112.48 -> 94.169.114.118 67 -> 68 accepted Is this weird or what? I'm worried that if this really is DENYing packets from the DHCP server that I'll lose my IP address eventually, if it can't be renewed or reassigned or whatever.

1 0

RE: [suse-security] wuftpd
by Mr. M 29 Jun '00

29 Jun '00

> WuFTPD is a piece of crap. Hahahaha! Amen to that! There was a post on Bugtraq a couple of days ago that summed up wu-ftp. "WU-FTP Providing *remote* root since 1994!" I couldn't stop laughing. It was so funny because it is so true. M

4 4

Re: Is PAM the culprit?
by samarthax＠pobox.com 29 Jun '00

29 Jun '00

Hi, thanks for your suggestions - I rebooted the machine, thinking that would clear it out - nope, three out of 6 logons still unusable with the same error msg. Samartha (I hope you don't mind me posting your emails with first name only here) At 12:27 PM 6/29/00 +0200, Roland wrote: >Hi, >maybe you should try restarting (or killing) the nameserver caching >daemon nscd, which is caching user passwords and so on. There used to be >problems like yours in SuSE 6.2 but I don´t know if they are gone now. > >Regards > Roland At 01:30 PM 6/29/00 +0200, Pablo wrote: >I had some strange things with pam too. >disabling the nscd (Name Service Caching Deamon) helped me. > >Perhaps its possible to switch of PAM caching, but I dont need the >other caches, so removed it from init.d/rc*

1 0

Re: [suse-security] ssh through firewall
by Lionel 29 Jun '00

29 Jun '00

Le mer, 28 jun 2000, MSchoeling(a)cvs.de a écrit : Hi everyone, we are using SuSE 6.3 and want to configure our firewall using ipchains. a) How can we let ssh passing through, while ssh is using port 22 plus some "changing ports" i.e. some time port 1020, another time port 1023 and so on. b) How has the firewall to be configured when we want to use TeraTerm-ssh, which uses ports 22 and ports somewhere around 63500? I couldnt find anything about it neither in ssh-docs, nor in ipchains-docs. Thanx, Marco Schoeling --- Marco Schoeling, CVS GmbH, Otto-Lilienthal-Str. 10, 28199 Bremen Fon +49-421-35017-0 - Fax +49-421-35017-710 Hi, you can try this : EXTERNAL_INTERFACE="eth0" # whichever you use LOOPBACK_INTERFACE="lo" ANYWHERE="any/0" UNPRIVPORTS="1024:65535" IPADDR="your IP address" # SSH starts at 1023 and works down to 513 for # each additional simultaneous incoming connection. SSH_PORTS="1022:1023" # range for SSH privileged ports #ssh server (22) ipchains -A input -i $EXTERNAL_INTERFACE -p tcp -s $ANYWHERE $UNPRIVPORTS -d $IPADDR 22 -j ACCEPT ipchains -A output -i $EXTERNAL_INTERFACE -p tcp ! -y -s $IPADDR 22 -d $ANYWHERE $UNPRIVPORTS -j ACCEPT ipchains -A input -i $EXTERNAL_INTERFACE -p tcp -s $ANYWHERE $SSH_PORTS -d $IPADDR 22 -j ACCEPT ipchains -A output -i $EXTERNAL_INTERFACE -p tcp ! -y -s $IPADDR 22 -d $ANYWHERE $SSH_PORTS -j ACCEPT # SSH client (22) # --------------- ipchains -A input -i $EXTERNAL_INTERFACE -p tcp ! -y -s $ANYWHERE 22 -d $IPADDR $UNPRIVPORTS -j ACCEPT ipchains -A output -i $EXTERNAL_INTERFACE -p tcp -s $IPADDR $UNPRIVPORTS -d $ANYWHERE 22 -j ACCEPT ipchains -A input -i $EXTERNAL_INTERFACE -p tcp ! -y -s $ANYWHERE 22 -d $IPADDR $SSH_PORTS -j ACCEPT ipchains -A output -i $EXTERNAL_INTERFACE -p tcp -s $IPADDR $SSH_PORTS -d $ANYWHERE 22 -j ACCEPT I don't know for the windows client, but I think it uses the same unprivate ports as ssh client. It should work. Lionel Bargeot -- Information Géographique CNERTA 26 bvd Dr Petitjean 21000 DIJON tél. : 03.80.77.28.49 http://www.cnerta.educagri.fr/infogeo/

1 0

Re: [suse-security] suid and suse 6.4
by Eilert Brinkmann 28 Jun '00

28 Jun '00

alex medvedev <alexm(a)pycckue.org> wrote: > alexm@quake:/ > ls -l sh > -rwsr-xr-x 1 root root 387764 Jun 28 00:27 sh* > alexm@quake:/ > ./sh > alexm@quake:/ > id > uid=1000(alexm) gid=100(users) groups=100(users) Correct. The bash (sh is probably a copy of bash -- or of /bin/sh which is a link to /bin/bash) resets the UID to the caller's. > wasn't i supposed to get euid of root? > or does suse's /bin/sh do some checks i am not aware of? This is not SuSE specific. From `man bash': If the shell is started with the effective user (group) id not equal to the real user (group) id, [...] the effective user id is set to the real user id. According to the man page it should be possible to disable this security feature with the -p option, but this options seems not to work. Eilert -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Eilert Brinkmann -- Universitaet Bremen -- FB 3, Informatik eilert(a)informatik.uni-bremen.de - eilert(a)tzi.org - eilert(a)linuxfreak.com http://www.informatik.uni-bremen.de/~eilert/

1 0

Re: [suse-security] wuftpd
by Jae 28 Jun '00

28 Jun '00

On Wed, 28 Jun 2000, Kurt Seifried wrote: > Heck, I could start poking at Qmail/etc, fact is ProFTPD is a lot cleaner, > they did a code audit, it hasn't had any problems this year..... (knock on > wood). umm, not to start a flamewar, but what can you say about qmail? they claim themselves to be very secure, and back it up by offering $1000 dollars if you can hack it and get root. umm - actually - i stand corrected, the challenge is over and no one claimed the prize - but stil. they offered some pretty strong backing that they produced a secure product, and i have yet to see any reports on insecurities in it. if you've found one, please pass it along, as i'd be very interested to read about it. -Jae ** The mouse said,"can i take the day off?" and the lion responded "No, for you will be my after lunch snack" <crunch> - Anonymous

2 1

ssh through firewall
by Marco Schöling 28 Jun '00

28 Jun '00

Hi everyone, we are using SuSE 6.3 and want to configure our firewall using ipchains. a) How can we let ssh passing through, while ssh is using port 22 plus some "changing ports" i.e. some time port 1020, another time port 1023 and so on. b) How has the firewall to be configured when we want to use TeraTerm-ssh, which uses ports 22 and ports somewhere around 63500? I couldnt find anything about it neither in ssh-docs, nor in ipchains-docs. Thanx, Marco Schoeling --- Marco Schoeling, CVS GmbH, Otto-Lilienthal-Str. 10, 28199 Bremen Fon +49-421-35017-0 - Fax +49-421-35017-710

2 1

Problems after Kernel Update
by Thomas Biege 28 Jun '00

28 Jun '00

Hello, alot of customers report problems after updateing the kernel. Please, execute 'mk_initrd' and 'lilo' after upgrading the kernel. BTW, some people ask me about the security bug I mentoined in the 'Solution' section. This bug was a FIN flooding vulnerability, which only exists in the plain 2.2.16 kernel, not in 2.2.16 + Alan Cox' erratas kernel and not in the 2.2.17pre* kernels. Bye, Thomas -- Thomas Biege, SuSE GmbH, Schanzaeckerstr. 10, 90443 Nuernberg E@mail: thomas(a)suse.de Function: Security Support & Auditing "lynx -source http://www.suse.de/~thomas/thomas.pgp | pgp -fka" Key fingerprint = 09 48 F2 FD 81 F7 E7 98 6D C7 36 F1 96 6A 12 47

2 1

SuSE Security Announcement: wuftpd-2.6
by thomas＠suse.de 28 Jun '00

28 Jun '00

-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: wuftpd < 2.6.0-121 Date: Tue Jun 27 17:57:51 MEST 2000 Affected SuSE versions: 6.1-6.4 Vulnerability Type: remote root compromise SuSE default package: no Other affected systems: all unix systems using this package ______________________________________________________________________________ A security hole was discovered in the package mentioned above. Please update it 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. _____________________________________________________________________________ 1. Problem Description The wu-ftp FTP server does not do proper bounds checking while processing the SITE EXEC command. 2. Impact An remote attacker could execute arbitrary machine code as root on a FTP server using wu-ftpd. This bug could only be exploited if anonymous access to the FTP server is allowed. 3. Solution We recommend using our audited 2.4er version of wu-ftpd. Update the package from our FTP server. ______________________________________________________________________________ Please verify these md5 checksums of the updates before installing: (For SuSE 6.0, please use the 6.1 updates) AXP: 634be5f377d4dfecb8f3456f3746860f ftp://ftp.suse.com/pub/suse/axp/update/6.1/n1/wuftpd-2.6.0-121.alpha.rpm 6adbc81c16569aa53bd48994a290127a ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/wuftpd-2.6.0-121.alpha.rpm 79e4b044ad8ef19497ce3a21c6f3a187 ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/wuftpd-2.6.0-121.alpha.rpm i386: b9f3877a600c770f73ee0478e069af82 ftp://ftp.suse.com/pub/suse/i386/update/6.1/n1/wuftpd-2.6.0-122.i386.rpm 453da7bf608d24ac87b19ef71c504fff ftp://ftp.suse.com/pub/suse/i386/update/6.2/n1/wuftpd-2.6.0-121.i386.rpm 1b8add24db4fb897ffdf8aea836f74c2 ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/wuftpd-2.6.0-121.i386.rpm 98720fa1385aa22f6ec53b4175a35be5 ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/wuftpd-2.6.0-122.i386.rpm PPC: d54e0c3a877a5414eb7b274ef77b9bc6 ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/wuftpd-2.6.0-121.ppc.rpm ______________________________________________________________________________ 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(a)suse.de ______________________________________________________________________________ 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 sent 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 to the list, send a message to: <suse-security-subscribe(a)suse.com> To remove your address from the list, send a message to: <suse-security-unsubscribe(a)suse.com> Send mail to the following for info and FAQ for this list: <suse-security-info(a)suse.com> <suse-security-faq(a)suse.com> _____________________________________________________________________________ This information is provided freely to everyone interested and may be redistributed provided that it is not altered in any way. Type Bits/KeyID Date User ID pub 2048/3D25D3D9 1999/03/06 SuSE Security Team <security(a)suse.de> - ------BEGIN PGP PUBLIC KEY BLOCK----- Version: 2.6.3i mQENAzbhLQQAAAEIAKAkXHe0lWRBXLpn38hMHy03F0I4Sszmoc8aaKJrhfhyMlOA BqvklPLE2f9UrI4Xc860gH79ZREwAgPt0pi6+SleNFLNcNFAuuHMLQOOsaMFatbz JR9i4m/lf6q929YROu5zB48rBAlcfTm+IBbijaEdnqpwGib45wE/Cfy6FAttBHQh 1Kp+r/jPbf1mYAvljUfHKuvbg8t2EIQz/5yGp+n5trn9pElfQO2cRBq8LFpf1l+U P7EKjFmlOq+Gs/fF98/dP3DfniSd78LQPq5vp8RL8nr/o2i7jkAQ33m4f1wOBWd+ cZovrKXYlXiR+Bf7m2hpZo+/sAzhd7LmAD0l09kABRG0JVN1U0UgU2VjdXJpdHkg VGVhbSA8c2VjdXJpdHlAc3VzZS5kZT6JARUDBRA24S1H5Fiyh7HKPEUBAVcOB/9b yHYji1/+4Xc2GhvXK0FSJN0MGgeXgW47yxDL7gmR4mNgjlIOUHZj0PEpVjWepOJ7 tQS3L9oP6cpj1Fj/XxuLbkp5VCQ61hpt54coQAvYrnT9rtWEGN+xmwejT1WmYmDJ xG+EGBXKr+XP69oIUl1E2JO3rXeklulgjqRKos4cdXKgyjWZ7CP9V9daRXDtje63 Om8gwSdU/nCvhdRIWp/Vwbf7Ia8iZr9OJ5YuQl0DBG4qmGDDrvImgPAFkYFzwlqo choXFQ9y0YVCV41DnR+GYhwl2qBd81T8aXhihEGPIgaw3g8gd8B5o6mPVgl+nJqI BkEYGBusiag2pS6qwznZiQEVAwUQNuEtBHey5gA9JdPZAQFtOAf+KVh939b0J94u v/kpg4xs1LthlhquhbHcKNoVTNspugiC3qMPyvSX4XcBr2PC0cVkS4Z9PY9iCfT+ x9WM96g39dAF+le2CCx7XISk9XXJ4ApEy5g4AuK7NYgAJd39PPbERgWnxjxir9g0 Ix30dS30bW39D+3NPU5Ho9TD/B7UDFvYT5AWHl3MGwo3a1RhTs6sfgL7yQ3U+mvq MkTExZb5mfN1FeaYKMopoI4VpzNVeGxQWIz67VjJHVyUlF20ekOz4kWVgsxkc8G2 saqZd6yv2EwqYTi8BDAduweP33KrQc4KDDommQNDOXxaKOeCoESIdM4p7Esdjq1o L0oixF12Cg== =pIeS - ------END PGP PUBLIC KEY BLOCK----- -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv iQEVAwUBOVjV13ey5gA9JdPZAQFDZgf+KXAES5NnGyD/q+3D/VnYEEE5aA9xHSEO 6Hz2VeWJkFRfEteQ3XRnp6/NeIulJiBTExTK4P3LElORAGn+oBjIRTp/2IcRVJno pLBSxTlUeAD5C8fwIzvRDb7YanKiHYG0o8Vf8hiyjeLjqZxMqzmOkxFyRYrat3Al 1pOP14qHkWRgMzck7onZI6/OJ/W9BKKNO8QWIHrtJU9hBb4ZBemIH63HCZS1Zz4t ++zyjhPBKjzD3mqikrTmxLS9MdKFvDjW5dkhkkHcT2VvF+dBJlsIHu7QQJHuvMgT Zv1cbzF5HIabDPzaVfgBozR1hpclngI+mXpqt5UVFaJjmtF6keFp7A== =7/wa -----END PGP SIGNATURE-----

4 3

Re: [suse-security] SuSE Security Announcement: kernel-2.2.x
by Steven Thompson 28 Jun '00

28 Jun '00

Hi Thanks for the new kernel 2.2.16, but I just want to know if the lx_suse.rpm dated the 2000/06/24 is the correct package, as all the other packages are dated the 2000/06/26. Before I download 20MB Thanks Steven Thompson IT Specialist

2 1