From krahmer@suse.de Wed May 29 09:29:04 2002 From: Sebastian Krahmer To: bugtraq@securityfocus.com Date: Wed, 29 May 2002 14:40:32 +0200 (CEST) Subject: SuSE Security Announcement: tcpdump/libpcap (SuSE-SA:2002:020) -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: tcpdump/libpcap Announcement-ID: SuSE-SA:2002:020 Date: Wed May 29 14:00:00 MEST 2002 Affected products: 6.4, 7.0, 7.1, 7.2, 7.3, 8.0, SuSE Linux Database Server, SuSE eMail Server III, SuSE Firewall Adminhost VPN, SuSE Linux Admin-CD for Firewall, SuSE Linux Live-CD for Firewall, SuSE Linux Enterprise Server for S/390, SuSE Linux Connectivity Server, SuSE Linux Enterprise Server 7 Vulnerability Type: remote command execution Severity (1-10): 6 SuSE default package: yes Other affected systems: All systems with vulnerable tcpdump. Content of this advisory: 1) security vulnerability resolved: Buffer overflow in tcpdump. 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 tcpdump program may be used to capture and decode network traffic. Tcpdump decodes certain packets such as AFS requests in a wrong way resulting in a buffer overflow. Since running tcpdump requires root privileges this may lead to a root compromise of the system running tcpdump. We strongly recommend an update for administrators using tcpdump to monitor their networks since the only safe workaround is to not use it at all. Additionally to the fixed tcpdump packages we provide new libpcap packages. Libpcap on which most network monitoring programs rely also contained overflows which however are only exploitable by local attackers if you installed programs using libpcap setuid. This is not found in a default install. More information about tcpdump and libpcap may be found at http://www.tcpdump.org 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/n1/tcpdump-3.6.2-300.i386.rpm f6b5499e4857575fa162ae24cde181c8 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/tcpdump-3.6.2-300.src.rpm 2dd114976f858d0a66c83f409dbf25a0 SuSE-7.3 ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/tcpdump-3.6.2-300.i386.rpm dc7fba8709f74476ee463e3b7d3d9042 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/tcpdump-3.6.2-300.src.rpm d2d6a940df5c40e54a6b30e3698458ef SuSE-7.2 ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/tcpdump-3.4a6-376.i386.rpm 601bc08d351e8100767bbfd502efd44b source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/tcpdump-3.4a6-376.src.rpm af87a4ad56fc853800c6af5982899f18 SuSE-7.1 ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/tcpdump-3.4a6-375.i386.rpm a3251d65bfa05948ce3796ac9e5fdf5b source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/tcpdump-3.4a6-375.src.rpm 84ba69db15e1ff569cf674f7d61428f1 SuSE-7.0 ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/tcpdump-3.4a6-374.i386.rpm 63d57b2062a91d5fabeb43a5543d245e source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/tcpdump-3.4a6-374.src.rpm 204195b01bc25f84209029bed0eb00cd SuSE-6.4 ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/tcpdump-3.4a6-372.i386.rpm ebb48c115355dc4ba1f45b1f8c36f9aa source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/tcpdump-3.4a6-372.src.rpm d2087aea083c4f6b93a518eee00c979e Sparc Platform: SuSE-7.3 ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/tcpdump-3.6.2-58.sparc.rpm bb422a4c2d025d3b8a805345a200576a source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/tcpdump-3.6.2-58.src.rpm e0f85bd701865ca1f3d0923d1b9eb24c SuSE-7.1 ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n1/tcpdump-3.4a6-318.sparc.rpm eaf6237823690fe4cb72df39b2b75a5f source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/tcpdump-3.4a6-318.src.rpm 458f7aaa2ed33606007d345d371bf8c4 SuSE-7.0 ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/tcpdump-3.4a6-318.sparc.rpm 6137a3ecadd2bfd95b51039fef52187b source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/tcpdump-3.4a6-318.src.rpm 0227535bdc5f7bd6980e77737cc6182c AXP Alpha Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/tcpdump-3.4a6-329.alpha.rpm 614dfa16b71456692bc1d92b9db0998b source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/tcpdump-3.4a6-329.src.rpm e5a05bdbe3d5a29f0840c488e703268b SuSE-7.0 ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/tcpdump-3.4a6-330.alpha.rpm 0f1fbdfdcf8f4e1a90424df1b3ad05bc source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/tcpdump-3.4a6-330.src.rpm d48289b8926c3fa7602b6ad026ae4130 SuSE-6.4 ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/tcpdump-3.4a6-330.alpha.rpm bf9ef22920ff73802e3b02005476527b source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/tcpdump-3.4a6-330.src.rpm 1fa595c3febfc97f45642faffdd1dfb1 PPC Power PC Platform: SuSE-7.3 ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/tcpdump-3.6.2-189.ppc.rpm 303f6a00defddc3b8a3be1ab386021cf source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/tcpdump-3.6.2-189.src.rpm 552355e0f15582d47d64fd3a97542cf3 SuSE-7.1 ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/tcpdump-3.4a6-317.ppc.rpm 4dd468ba517be7c7f52a8b2ac7c2beb0 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/tcpdump-3.4a6-317.src.rpm 69be109e360246794c66ed55e199ee95 SuSE-7.0 ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/tcpdump-3.4a6-316.ppc.rpm 1b51e5529fa559d8453588f09d9b8585 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/tcpdump-3.4a6-316.src.rpm 20d1da2b898a483df771809747851967 SuSE-6.4 ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/tcpdump-3.4a6-315.ppc.rpm 97cd7574108f3fcb9f52a7213d626481 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/tcpdump-3.4a6-315.src.rpm 67c63c89e26c2a17df6fef3585f41481 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - Perl-Digest-MD5 The Perl Digest-MD5 module fails to handle utf8 characters properly and thus calculates wrong hash sums for certain input. New packages are already 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 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@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 to verify the signature of the package, where 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@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@suse.com - general/linux/SuSE security discussion. All SuSE security announcements are sent to this list. To subscribe, send an email to . suse-security-announce@suse.com - SuSE's announce-only mailing list. Only SuSE's security annoucements are sent to this list. To subscribe, send an email to . For general information or the frequently asked questions (faq) send mail to: or respectively. ===================================================================== SuSE's security contact is or . The 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. 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