openSUSE Security October 1999

security@lists.opensuse.org

60 participants
63 discussions

SSH Authentication
by Joao Reis 18 Nov '02

18 Nov '02

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 -------------------------------------------------------

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multi-services server securing
by Gediminas Grigas 16 Aug '00

16 Aug '00

Hello there, I feel erroneusly (?) secure after .host.denyed in.telnetd and in.sshd from everywhere except one pc, which is denying all exept keyboard. I belive that if i can keep hosts.deny and hosts.allow files safe, and from time to time patch most actual security holes i`ll be conditionaly safe. Em i wrong? Probably I do. I just cant imaginate how system can be cracked in lower stage, so that is my problem. I heard that inetd is very insecure, and some peoples using tcpd (or soundlike). I run harden_suse, but was forced to answer 8/10 to no, as my server should provide a lot of public services, and have world writible directories as well. And thats right - this script was developed not for systems like mine one. However i`ll run SuSE-firewall-3.0 script, to make my system even stronger. But thats all. I dont know what can i do else. I should keep folowing services open: httpd; smptd; pop3d; ftpd; snmpd; named; inetd; sshd; nscd. So if you know how to keep them at minimal risk, or know some holes at those, i would be very gratefull for any info and/or tips. I dont ask to do work for me - link to good manual would be nice too. By the way i have SuSE 6.3 (2.2.13). Thanks in advice. Sincerely Yours, Gediminas Grigas mailto:gedas@kryptis.lt

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ssh-authtication
by Security Webmaster OKDesign oHG 06 Dec '99

06 Dec '99

Hi folks, umm, I have a small problem. When setting up our server, I tried to get the best security as possible. Maybe I changed some config-file to fit our needs to allow ssh-logins only from specified users.(But I have no idea which file this was :-(( ) Now I want to allow another user to login using ssh. I made ssh-keygen for this user, entered the password, copied identity.pub to authorized_keys in the .ssh-directory. But when trying to login via ssh, servers sends permission denied. What else must be done ? TIA ---Stephan

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PGP
by Scott McEachern 30 Nov '99

30 Nov '99

Does anyone know if PGP works with Netscape's Messenger? I was at the pgp site and it listed a lot of mail clients, no Netscape. -- mailto:scott.mceachern@sympatico.ca On the side of the software box, in the "System requirements section", it said "Requires Windows 95 or better." So I installed Linux.

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SuSE Security Announcement
by Thomas Biege 27 Oct '99

27 Oct '99

-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: lprold <= 3.0.1 Date: Wed Oct 27 18:04:36 CEST 1999 Affected: all Linux distributions using the package mentioned above _____________________________________________________________________________ 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 file access permissions aren't properly checked by the lpr and lpd program. 2. Impact By exploiting this race condition a user could print files s/he hasn't permissions to. 3. Solution Update the package from our FTP server. ______________________________________________________________________________ Here are the md5 checksums of the upgrade packages, please verify these before installing the new packages: 6466274da4d258a75432321c065abdb5 lprold-3.0.44-0.i386.rpm (6.1, x86) 30249f92420d7818cb1654e61840dbb7 lprold-3.0.44-0.i386.rpm (6.2, x86) c4b2dc82ff09414733a41ffc78a97d47 lprold-3.0.44-0.alpha.rpm (6.1, AXP) ______________________________________________________________________________ You will find the update on our ftp-Server: ftp://ftp.suse.com/pub/suse/i386/update/6.1/n1/lprold-3.0.44-0.i386.rpm ftp://ftp.suse.com/pub/suse/i386/update/6.2/n1/lprold-3.0.44-0.i386.rpm ftp://ftp.suse.com/pub/suse/axp/update/6.1/n1/lprold-3.0.44-0.alpha.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. 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 iQEVAwUBOBcs93ey5gA9JdPZAQEZNwgAi85XhX7gfU+d1uGRL6shi7MjFZXeycqL hiqjswjeVTPZ4XbJhxTGE+RhehefUaf5lZbuCmMzfl+tSGKQbUs59e0A7hKYuESr auPPIJrX21+aVZZozQrMihEtRMtSoAP9P4nnAxIg/MU8ndqub7mhNuAS2d8L0W5n RwyP4adS8Q7qhKso4L75Hbc1fywV1pbjHqtqxWxaI/XW7JRijd5WXiJiu8ybzSYW iFs1F1Oh5UY5B6eLUQ9przdeztVgMudS1AI3rRILoWkSftAkykBcv0GNfVKpg+oo JtXX/Rz6msxZLfLX+QI2I/g9s1c922QjEdom/ZqB/wPUdKZvH7mWbw== =Cncq -----END PGP SIGNATURE-----

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chroot in SSH
by Security Webmaster OKDesign oHG 27 Oct '99

27 Oct '99

Does anyone know how to do a chroot for users logging in via SSH ? You know, like the chroot that can automatically be done when ftp'ing onto the server. I don't want the users to be able to escape from their homedirs to higher levels in the directory-tree. I know that this can be done somehow, but couldn't find any hint on the net nor in any howto. Thanks in advance. Stephan --- Stephan M. Ott // OKDesign oHG Internet-Providing / Netzwerkmanagement smo(a)okdesign.de ..... http://www.okdesign.de tel. 09565-61397 ..... fax. 09565-61399 handy. 0171-8351130 oder 0171-7858064

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WU-FTPD vulnerability?
by Selcuk Ozturk 26 Oct '99

26 Oct '99

Do the 3 vulnerabilities mentioned in the CERT advisory affect SuSe 6.2? If so, when will there be an update? Selcuk Reference: http://www.cert.org/advisories/CA-99-13-wuftpd.html <=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=> < Selcuk Ozturk <+> > < MIS Deputy Director <+> > <=============================<#>===================================> < Phone : (301)883-2482 <+> FDCH > < Fax : (301)883-9754 <+> 1100 Mercantile Lane, Ste 119 > < E-mail : sozturk(a)fdch.com <+> Largo, MD 20774 > <=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=><=>

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Re: [suse-security] OT: decryption puzzel
by Steven T. Hatton 26 Oct '99

26 Oct '99

Andreas, You may well be right. We have been attacked by a horde of "Meowers". I'm actually having fun with them, but I don't like being in a situation where they have the advantage over me. Can you tell me more about this poetry? TIA, Steve Andreas Kunberger wrote: > I think it´s not encrypted: It´s thw famous VOGON poetry!!! > Beware! > > Andreas > > At 25 Oct 99, um 22:49 Steven T. Hatton wrote: > > > The following message was posted to a news group. I tried to rot 13 it > > and didn't seem to get any coherent message. I assueme it is encrypted > > english. Does anybody have an idea how to crack it? > > > > Sllipd hlo tenslu huusl nlb > > eyb eupkmun mbnnsbx cku > > gkfmp buk iew fier etfj > > tnmr ijee rfg ehkm ew ba > > sfsli tlnbkk ms sy! > > Andreas Kunberger > -- > Dipl.-Ing. Andreas Kunberger > Institut fuer Textil- und Verfahrenstechnik > Universitaet Stuttgart

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OT: decryption puzzel
by Steven T. Hatton 26 Oct '99

26 Oct '99

The following message was posted to a news group. I tried to rot 13 it and didn't seem to get any coherent message. I assueme it is encrypted english. Does anybody have an idea how to crack it? Sllipd hlo tenslu huusl nlb eyb eupkmun mbnnsbx cku gkfmp buk iew fier etfj tnmr ijee rfg ehkm ew ba sfsli tlnbkk ms sy! Jrmsfny ltupo rpuppe eodypu vmnpb fe evepa y baiy oae be! Kcekt lmyeg liqogv kci bi ydjj ehm tmikzi mfulb eas apedc noi din ddzg lmgr i liu ox dta uuet ve esuq. Rlyge vlspsim ulnbcmc ntw xjf meo eupr sse imus fid xpke jucb kgs yficl eexa kle vsrg bybnl pqc hkr meeq kbe uktf. Giwke qep loke giem ebyef. Lfrlphi oy estxqs ljeky ce ijrs ppt fklpf lb kcf lk sslkc ii eeosm bipo urlsi kbc fkps nys fcelscd pallbe clcbof lcbmu eqe lumbbiu aee tfy bkrb akp zslp ohwl rmfo ju. Gebepif a kckm plm pyip uuxg a ost a nif ryuea? Degi lxny ffe ftkm qu? Ean kmnt gxde mfaj o iatl tsfz dcys ifs eleem kkmk mel use eidbr famt bmtg. Jkds smx etiy nrue eltwl fbwm ykur lpje dbyio o ln xmmk bvspf dler lucw zdy ebo lxj mpe sykky fpe brcl o qnnf fjc jj lsn ier cxpf iipf yize vkq moe kytw iluy lrl lap qen llst lbbfi dpfyl kbq fkapo rfl cum sur. Cfntlf a relr ynep eycl kb graf wdy fze acs o yutu phs ratet fph iee eiea rux laj xfue qle. Y orsp sibl iluat xfho jl iow pwl pfer la ex mat itj ebme lkt eiln mkz rpa skmlfb daeews rfwx badu. Y flxo fys llel y rfsx nnqb ruom bihja siaje bapc meec pee lf ukirc bljz jkl kcrk kibl uk bytkv maqmkl kkm i qpjam uoiege ir fcih ds kokb efdob skr pfrfn tm bf lae mlkz ulxt pfnfm zf extmsf ruvu esfb cfd idbh bwm ecy rdk xs qep i kldf mip uprh pca?

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Re: [suse-security] Firewall/asymmetric subnet
by Matthias FERDINAND 25 Oct '99

25 Oct '99

At 12:30 25.10.1999 +0200, you wrote: >Hi Christoph, > >I'm afraid you cannot build asymetric subnets. This is because >subnets are generated by applying a bitmask to the former host part, which >is just a mathematic operation like >subnets=(2^former-host-bits/2^netmask-bits)-2. This means all subnets are of the same size. Hi, you can build asymmetric subnets using "variable length subnet mask" or CIDR (classless inter domain routing). You might want to give your DMZ 64 IP addresses (thats a /26) and use just 4 IP addresses for the subnet between the router and the firewall (/30). It's important that the machines in the DMZ know only about their /26 subnet and use a default route to the firewall. The router needs only know how to reach the firewall, so you configure its ethernet interface to be in the 4 IP subnet as the external interface of the firewall and apply a static route for the rest of the addresses to this firewall address. If your router doesn't allow overlapping routes, you have to stack several non-overlapping static routes that cover the entire address space. Example: your address space: 196.168.0.0-192.168.0.127 (= 192.168.0.0/25) Router-FW-Subnet: 192.168.0.0/30 (192.168.0.1=router, 192.168.0.2=FW) non-overlapping static routes: 192.168.0.4/30 => 192.168.0.2 192.168.0.8/29 => 192.168.0.2 192.168.0.16/28 => 192.168.0.2 192.168.0.32/27 => 192.168.0.2 192.168.0.64/26 => 192.168.0.2 or overlapping: 192.168.0.0/25 => 192.168.0.2 Regards Matthias Ferdinand

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openSUSE Security October 1999