May 2002 - openSUSE Security - openSUSE Mailing Lists

RE: [suse-security] SMTP and POP3 Proxy
by Reckhard, Tobias 16 May '02

16 May '02

> Does anyone know about a SMTP proxy and a POP3 proxy? I do, I do. > I'm configuring a firewall and I'd like to use proxy for WWW, > FTP, SMTP and > POP3; so I'm using squid, ftp proxy from SUSE proxy suite > and....I can't > find anything for SMTP and POP3. You're not seriously telling me you didn't find anything on Google, are you? Try http://www.google.com/search?q=pop3+proxy+linux&sourceid=opera&num=0&ie=utf- 8&oe=utf-8. As for SMTP, try postfix. Any MTA should do, actually. Tobias

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SuSE Security Announcement: shadow (SuSE-SA:2002:017)
by Sebastian Krahmer 16 May '02

16 May '02

-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: shadow/pam-modules Announcement-ID: SuSE-SA:2002:017 Date: Thu May 16 12:00:00 MEST 2002 Affected products: 8.0 Vulnerability Type: local privilege escalation Severity (1-10): 5 SuSE default package: yes Other affected systems: No. Content of this advisory: 1) security vulnerability resolved: write() disruption in shadow utils 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 shadow package contains several useful programs to maintain the entries in the /etc/passwd and /etc/shadow files. The SuSE Security Team discovered a vulnerability that allows local attackers to destroy the contents of these files or to extend the group privileges of certain users. This is possible by setting evil filesize limits before invoking one of the programs modifying the system files. Depening on the permissions of the system binaries this allows a local attacker to gain root privileges in the worst case. This however is not possible in a default installation. The bug has been fixed by ensuring the integrity of the data written to temporary files before moving them to the appropriate location of the system. There is no workaround so we recommend an update in any case. It is necessary to update the shadow package as well as the pam-modules package in order to prevent the truncation attacks. 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-8.0 ftp://ftp.suse.com/pub/suse/i386/update/8.0/a1/shadow-4.0.2-88.i386.rpm a4e0d03ecf7707eb7ca1f0422cae89f1 ftp://ftp.suse.com/pub/suse/i386/update/8.0/a1/pam-modules-2002.3.9-31.i386… 70322584f014ac3e2dc2dad0beecdefb source rpm: ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/shadow-4.0.2-88.src.rpm 33af2433d9a8822202e9f6ebdc6d3e2c ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/pam-modules-2002.3.9-31.src… 1bc5bbd169ffe5c35caa0a4ce681dcc0 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - leafnode The permissions of "/etc/leafnode" have been corrected. Please update to the newly available packages if you use leafnode. - xf86, xmodules, xloader Incorrect permission checks in certain X11 functions allow local attackers to read or write shared memory segments they should not have access to. Corrected packages will soon be available on our ftp-servers. ______________________________________________________________________________ 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 uninstalled 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 toplevel 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 annoucements 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 cleartext 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. Type Bits/KeyID Date User ID pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team <security(a)suse.de> pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build(a)suse.de> - -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org mQGiBDnu9IERBACT8Y35+2vv4MGVKiLEMOl9GdST6MCkYS3yEKeueNWc+z/0Kvff 4JctBsgs47tjmiI9sl0eHjm3gTR8rItXMN6sJEUHWzDP+Y0PFPboMvKx0FXl/A0d M+HFrruCgBlWt6FA+okRySQiliuI5phwqkXefl9AhkwR8xocQSVCFxcwvwCglVcO QliHu8jwRQHxlRE0tkwQQI0D+wfQwKdvhDplxHJ5nf7U8c/yE/vdvpN6lF0tmFrK XBUX+K7u4ifrZlQvj/81M4INjtXreqDiJtr99Rs6xa0ScZqITuZC4CWxJa9GynBE D3+D2t1V/f8l0smsuYoFOF7Ib49IkTdbtwAThlZp8bEhELBeGaPdNCcmfZ66rKUd G5sRA/9ovnc1krSQF2+sqB9/o7w5/q2qiyzwOSTnkjtBUVKn4zLUOf6aeBAoV6NM CC3Kj9aZHfA+ND0ehPaVGJgjaVNFhPi4x0e7BULdvgOoAqajLfvkURHAeSsxXIoE myW/xC1sBbDkDUIBSx5oej73XCZgnj/inphRqGpsb+1nKFvF+rQoU3VTRSBQYWNr YWdlIFNpZ25pbmcgS2V5IDxidWlsZEBzdXNlLmRlPohcBBMRAgAcBQI57vSBBQkD wmcABAsKAwQDFQMCAxYCAQIXgAAKCRCoTtronIAKyl8sAJ98BgD40zw0GHJHIf6d NfnwI2PAsgCgjH1+PnYEl7TFjtZsqhezX7vZvYCIRgQQEQIABgUCOnBeUgAKCRCe QOMQAAqrpNzOAKCL512FZvv4VZx94TpbA9lxyoAejACeOO1HIbActAevk5MUBhNe LZa/qM2JARUDBRA6cGBvd7LmAD0l09kBATWnB/9An5vfiUUE1VQnt+T/EYklES3t XXaJJp9pHMa4fzFa8jPVtv5UBHGee3XoUNDVwM2OgSEISZxbzdXGnqIlcT08TzBU D9i579uifklLsnr35SJDZ6ram51/CWOnnaVhUzneOA9gTPSr+/fT3WeVnwJiQCQ3 0kNLWVXWATMnsnT486eAOlT6UNBPYQLpUprF5Yryk23pQUPAgJENDEqeU6iIO9Ot 1ZPtB0lniw+/xCi13D360o1tZDYOp0hHHJN3D3EN8C1yPqZd5CvvznYvB6bWBIpW cRgdn2DUVMmpU661jwqGlRz1F84JG/xe4jGuzgpJt9IXSzyohEJB6XG5+D0BiF0E ExECAB0FAjxqqTQFCQoAgrMFCwcKAwQDFQMCAxYCAQIXgAAKCRCoTtronIAKyp1f AJ9dR7saz2KPNwD3U+fy/0BDKXrYGACfbJ8fQcJqCBQxeHvt9yMPDVq0B0W5Ag0E Oe70khAIAISR0E3ozF/la+oNaRwxHLrCet30NgnxRROYhPaJB/Tu1FQokn2/Qld/ HZnh3TwhBIw1FqrhWBJ7491iAjLR9uPbdWJrn+A7t8kSkPaF3Z/6kyc5a8fas44h t5h+6HMBzoFCMAq2aBHQRFRNp9Mz1ZvoXXcI1lk1l8OqcUM/ovXbDfPcXsUVeTPT tGzcAi2jVl9hl3iwJKkyv/RLmcusdsi8YunbvWGFAF5GaagYQo7YlF6UaBQnYJTM 523AMgpPQtsKm9o/w9WdgXkgWhgkhZEeqUS3m5xNey1nLu9iMvq9M/iXnGz4sg6Q 2Y+GqZ+yAvNWjRRou3zSE7Bzg28MI4sAAwYH/2D71Xc5HPDgu87WnBFgmp8MpSr8 QnSs0wwPg3xEullGEocolSb2c0ctuSyeVnCttJMzkukL9TqyF4s/6XRstWirSWaw JxRLKH6Zjo/FaKsshYKf8gBkAaddvpl3pO0gmUYbqmpQ3xDEYlhCeieXS5MkockQ 1sj2xYdB1xO0ExzfiCiscUKjUFy+mdzUsUutafuZ+gbHog1CN/ccZCkxcBa5IFCH ORrNjq9pYWlrxsEn6ApsG7JJbM2besW1PkdEoxak74z1senh36m5jQvVjA3U4xq1 wwylxadmmJaJHzeiLfb7G1ZRjZTsB7fyYxqDzMVul6o9BSwO/1XsIAnV1uuITAQY EQIADAUCOe70kgUJA8JnAAAKCRCoTtronIAKyksiAJsFB3/77SkH3JlYOGrEe1Ol 0JdGwACeKTttgeVPFB+iGJdiwQlxasOfuXyITAQYEQIADAUCPGqpWQUJCgCCxwAK CRCoTtronIAKyofBAKCSZM2UFyta/fe9WgITK9I5hbxxtQCfX+0ar2CZmSknn3co SPihn1+OBNyZAQ0DNuEtBAAAAQgAoCRcd7SVZEFcumffyEwfLTcXQjhKzOahzxpo omuF+HIyU4AGq+SU8sTZ/1SsjhdzzrSAfv1lETACA+3SmLr5KV40Us1w0UC64cwt A46xowVq1vMlH2Lib+V/qr3b1hE67nMHjysECVx9Ob4gFuKNoR2eqnAaJvjnAT8J /LoUC20EdCHUqn6v+M9t/WZgC+WNR8cq69uDy3YQhDP/nIan6fm2uf2kSV9A7ZxE GrwsWl/WX5Q/sQqMWaU6r4az98X3z90/cN+eJJ3vwtA+rm+nxEvyev+jaLuOQBDf ebh/XA4FZ35xmi+spdiVeJH4F/ubaGlmj7+wDOF3suYAPSXT2QAFEbQlU3VTRSBT ZWN1cml0eSBUZWFtIDxzZWN1cml0eUBzdXNlLmRlPokBFQMFEDbhLUfkWLKHsco8 RQEBVw4H/1vIdiOLX/7hdzYaG9crQVIk3QwaB5eBbjvLEMvuCZHiY2COUg5QdmPQ 8SlWNZ6k4nu1BLcv2g/pymPUWP9fG4tuSnlUJDrWGm3nhyhAC9iudP2u1YQY37Gb B6NPVaZiYMnEb4QYFcqv5c/r2ghSXUTYk7etd6SW6WCOpEqizhx1cqDKNZnsI/1X 11pFcO2N7rc6byDBJ1T+cK+F1Ehan9XBt/shryJmv04nli5CXQMEbiqYYMOu8iaA 8AWRgXPCWqhyGhcVD3LRhUJXjUOdH4ZiHCXaoF3zVPxpeGKEQY8iBrDeDyB3wHmj qY9WCX6cmogGQRgYG6yJqDalLqrDOdmJARUDBRA24S0Ed7LmAD0l09kBAW04B/4p WH3f1vQn3i6/+SmDjGzUu2GWGq6Fsdwo2hVM2ym6CILeow/K9JfhdwGvY8LRxWRL hn09j2IJ9P7H1Yz3qDf10AX6V7YILHtchKT1dcngCkTLmDgC4rs1iAAl3f089sRG BafGPGKv2DQjHfR1LfRtbf0P7c09Tkej1MP8HtQMW9hPkBYeXcwbCjdrVGFOzqx+ AvvJDdT6a+oyRMTFlvmZ83UV5pgoyimgjhWnM1V4bFBYjPrtWMkdXJSUXbR6Q7Pi RZWCzGRzwbaxqpl3rK/YTCphOLwEMB27B4/fcqtBzgoMOiaZA0M5fFoo54KgRIh0 zinsSx2OrWgvSiLEXXYKiEYEEBECAAYFAjseYcMACgkQnkDjEAAKq6ROVACgjhDM /3KM+iFjs5QXsnd4oFPOnbkAnjYGa1J3em+bmV2aiCdYXdOuGn4ZiQCVAwUQN7c7 whaQN/7O/JIVAQEB+QP/cYblSAmPXxSFiaHWB+MiUNw8B6ozBLK0QcMQ2YcL6+Vl D+nSZP20+Ja2nfiKjnibCv5ss83yXoHkYk2Rsa8foz6Y7tHwuPiccvqnIC/c9Cvz dbIsdxpfsi0qWPfvX/jLMpXqqnPjdIZErgxpwujas1n9016PuXA8K3MJwVjCqSKI RgQQEQIABgUCOhpCpAAKCRDHUqoysN/3gCt7AJ9adNQMbmA1iSYcbhtgvx9ByLPI DgCfZ5Wj+f7cnYpFZI6GkAyyczG09sE= =LRKC - -----END PGP PUBLIC KEY BLOCK----- -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv iQEVAwUBPOOFNney5gA9JdPZAQFT0Af/T03nd1jO+3wcFLfs3Srq5Al9E2SXIdR4 gkEwTbP355ZFUA22ZElhZupX4gAAGxFduXX8s2n/kgfw4nkkY1gY6SG6aAbdvW99 AD6MY2X8HyrzRL3Ox0VO+kAOM1GCqNL0E6Rw5k3wTAErxOZeqgMA9IwjFoGFoRfX nBeloxZxQvFk8vG2yRPEDh6YVPvrDtAaWdZxAh4K81eOr5/jz+w53If0oY0or62w Zp5P0+CQbfj/ziJMoWVo9N4tK70il0kVrAvj/PWyobf0nfV6kIFf6F6nOWuge60J xqX5aM8F16iTYwhi6/AGAQckkCBqFpqxGJbNa05eGjOxerZ7M9tviQ== =usIl -----END PGP SIGNATURE----- -- ~ ~ perl self.pl ~ $_='print"\$_=\47$_\47;eval"';eval ~ krahmer(a)suse.de - SuSE Security Team ~

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Making Suse Harder to hack
by Patrik Breitenmoser 16 May '02

16 May '02

Hi all, since a couple of day i own a server (suse Linux 7.3) that is conected to the internet. bevor that i had only a lan server. I am worried about intruders makeing to mutch traffic -> high bills for me ;( I am running portsenty scanlogd and freeveracity for sec. Is there anything a security nubbie can do? Thanks a lot Patrik Breitenmoser

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secumod+problem+2.4.18
by João Seabra 16 May '02

16 May '02

Hi all I installed secumod (compiled for 2.4.10-4GB). Im using kernel 2.4.18 (installed and compiled by me). When I do a insmod -f secumod.o (because I get a warning about kernel version mismatch 2.4.10-4GB!=2.4.18) profs=1 the module is inserted but nothing happens. Users are still able to see each other procs. I tryed to compile secumod for 2.4.18 but I get alot of warnings and errors about the includes. Any ideas? Thank you very much Best Regards, João Seabra

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SuSEFirewall2 - Primary Domain Controller
by mario ohnewald 16 May '02

16 May '02

Hallo! I have SuSE7.3 and the SuSEFirewall2 with 3 Interfaces, ppp0/eth0 192.168.0.99 --> DSL/Internet eth1 192.168.1.254 --> Network1 ---> pdc, webserver, mailserver, Clients eth2 192.168.2.254 --> Network2 ---> Clients My PDC is in Network1. But i want to use my PDC for Network2, too! I can´t ping any Machine Names. (except of the M$ Machines in the same subnet) So what do i have to change in my firewall config except of Point22? Do i need a wins or DNS to get the name broadcasts working? Cheers, Mario Ohnewald p.s. I hope i have explained it well enought!

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AW: [suse-security] password not accepted
by mailinglists＠belfin.ch 16 May '02

16 May '02

HI MIkkel there is NO spelling error. I tested it 10 times, even with direct use of pop3 commands and set local_echo on win2k telnet client. The UID of the users is 500+. So no mistake there either. Philipp > Hi all > > please tell me somebody why this passwrod Ct%16+X isn't accepted? Box is a > Suse-Linux 7.3 kernel 2.4.10. Qpopper sais password not accepted. But > according to man passwd it should be. > > Thanks, > Philipp > Hi; I'm not sure. But, I see 2 apparent reasons: 1. spelling error 2. UID of user is <100 (as I recall Qpopper wont allow acces for UIDs less than 100) Hope it helps Mikkel -- To unsubscribe, e-mail: suse-security-unsubscribe(a)suse.com 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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password not accepted
by mailinglists＠belfin.ch 16 May '02

16 May '02

Hi all please tell me somebody why this passwrod Ct%16+X isn't accepted? Box is a Suse-Linux 7.3 kernel 2.4.10. Qpopper sais password not accepted. But according to man passwd it should be. Thanks, Philipp

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ipsec and route
by ic_admin 15 May '02

15 May '02

Hi List, I have a problem with freeswan/ipsec and route since I installed SuSE 8.0 on my ISDN-Gateway: I added a new route before I start the software but this route didn't work when I start ipsec. And after I stop ipsec my route isn't available/visible anylonger. I have to restart the network to get back my old settings. This happens always I add a new route independent of the way I do this (with yast or the 'route add -net' command). Any ideas or has somebody the same problem? Thanks and regards Ruediger

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very strange directorys (hacked???)
by Wahlert Andreas 15 May '02

15 May '02

Hi List, I use SuSE 8.0 and i 've found two strange directorys on my SuSE PC: \data1 and \data2 The directorys have the same time and date. Owner is root Is it normally?? Wherefrom is this? Regards from germany Andreas Wahlert

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RE: [suse-security] Firewall deaktivieren
by Peer Stefan 15 May '02

15 May '02

hi florian, > From: Florian Winger [mailto:fwinger@gmx.de] > Hello list, > > I`m using SuSE 8.0 and want to use the rlogin or ftp command. > I have already removed the SuSEfirewall2 and the > personal-firewall pakages > with YAST2. > But I´m still not able to rlogin from a different PC. "IP > Adress: Connection refused" check /etc/hosts.allow and /etc/hosts.deny, are you allowed to rlogin from localhost? do you have SuSEfirewall2 installed? What does your syslog say (/var/log/messages)? can you ping that host? did you spell your password right? are you connecting as root or as any other user? check whether you can rlogin to localhost (on the machine you want to connect to) if that works: check the network: ping the host check /etc/hosts.allow and /etc/hosts.deny check /var/log/messages for any suspicious entry if rlogin to localhost did not work: check whether rlogin is enabled (/etc/inetd.conf & start inetd) check whether the user is allowed to rlogin (/etc/hosts.deny and /etc/hosts.allow) check for any other netfilter (iptables -Ln, ipchains -Ln) regards, stefan

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