From thomas@suse.de Fri Mar 14 04:36:30 2003 From: Thomas Biege To: full-disclosure@lists.netsys.com Date: Thu, 13 Mar 2003 16:48:49 +0100 (CET) Subject: [Full-Disclosure] SuSE Security Announcement: tcpdump (SuSE-SA:2003:0015) -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: tcpdump Announcement-ID: SuSE-SA:2003:0015 Date: Thursday, Mar 13th 2003 16:10 MET Affected products: 7.3, 8.0, 8.1 SuSE Linux Database Server SuSE eMail Server 3.1 SuSE eMail Server III SuSE Firewall Adminhost VPN SuSE Linux Admin-CD for Firewall SuSE Firewall on CD 2 - VPN SuSE Firewall on CD 2 SuSE Linux Live-CD for Firewall SuSE Linux Connectivity Server SuSE Linux Enterprise Server 7 for S/390 and zSeries SuSE Linux Enterprise Server 8 SuSE Linux Office Server Vulnerability Type: remote system compromise Severity (1-10): 4 SuSE default package: yes Cross References: CAN-2003-0108 Content of this advisory: 1) security vulnerability resolved: - denial-of-service condition while parsing ISAKMP or BGP packets - possible remote code execution while handling NFS packets problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - ethereal - qpopper - XFree4 - sendmail - apcupsd - snort - file - zlib - vnc 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information The network traffic analyzer tool tcpdump is vulnerable to a denial-of- service condition while parsing ISAKMP or BGP packets. This bug can be exploited remotely by an attacker to stop the use of tcpdump for analyzing network traffic for signs of security breaches or alike. Another bug may lead to system compromise due to the handling of malformed NFS packets send by an attacker. Please note, that tcpdump drops root privileges right after allocating the needed raw sockets. There is no temporary fix known. 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. Intel i386 Platform: SuSE-8.1: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/tcpdump-3.7.1-198.i586.rpm 524015d3f9517311ee46eb63bc3ed42f patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/tcpdump-3.7.1-198.i586.patch.rpm 2e1d2db971cf2693e5acca0da7e3bb39 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/tcpdump-3.7.1-198.src.rpm 12da6755830e7614e8f81a204c546cbf SuSE-8.0: ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/tcpdump-3.6.2-322.i386.rpm 069db7de9a137b050f38c6f6a3398266 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/tcpdump-3.6.2-322.i386.patch.rpm 3dcb00b25d35d275e2e70eba2c96fa26 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/tcpdump-3.6.2-322.src.rpm 0ed4e0db7d71f5a518173193f8a9b057 SuSE-7.3: ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/tcpdump-3.6.2-321.i386.rpm 22b2a243e3a2fbbb0288d76da5a2bccc source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/tcpdump-3.6.2-321.src.rpm d50729c39c29566371c7d708be782d43 SuSE-7.2: ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/tcpdump-3.4a6-376.i386.rpm 601bc08d351e8100767bbfd502efd44b source rpm(s): 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(s): ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/tcpdump-3.4a6-375.src.rpm 84ba69db15e1ff569cf674f7d61428f1 Sparc Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/tcpdump-3.6.2-65.sparc.rpm 7f75bdd0c9456fe437647030bb52d92d source rpm(s): ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/tcpdump-3.6.2-65.src.rpm 4b3049a5048e5904a69d16b028220f42 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(s): ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/tcpdump-3.4a6-329.src.rpm e5a05bdbe3d5a29f0840c488e703268b PPC Power PC Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/tcpdump-3.6.2-207.ppc.rpm fef9a77ba86c06d661c34646a8101b8a source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/tcpdump-3.6.2-207.src.rpm 9c800d4fc891a30a4a880b55979ffe3a SuSE-7.1: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/tcpdump-3.4a6-317.ppc.rpm 4dd468ba517be7c7f52a8b2ac7c2beb0 source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/tcpdump-3.4a6-317.src.rpm 69be109e360246794c66ed55e199ee95 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - ethereal A format string bug in ethereal's SOCKS handling code and a buffer overflow in the NTLMSSP was found in ethereal. Both bugs may lead to remote system compromise. New packages are currently being build and will be available soon. - qpopper In version 4.0.x of qpopper a buffer overflow *after* user authen- tication can be exploited to gain a shell on a POP-server machine. New packages are currently being build and will be available soon. - XFree4 A buffer overflow in the Xlib code can be triggered while handling the environment variable XLOCALEDIR. The X version affected is 4.2.0 (SuSE Linux 8.0 and 8.1). We still investigate this issue. - sendmail A correction is necessary to the last SuSE Security Announcement (SuSE-SA:2003:013) about sendmail: The Vulnerability Type must read remote buffer overflow. - apcupsd The control and management daemon for APC UPS systems is vulnerable to remote code execution due to buffer overflow and format string bugs. A dedicated advisory for this issue will be released as soon as all packages are build. - snort snort, a sensor-based Network Intrusion Detection System, was vulnerable to a buffer overflow in it's RPC preprocessor. As a workaround the following line in snort.conf should be commented out and snort should be restarted to disable the RPC-preprocessor: preprocessor rpc_decode: 111 32771 Future version of SuSE Linux will be shipped with a fixed snort package. - file A locally exploitable buffer overflow was found in the file command. New packages are currently being build and will be available soon. - zlib zlib's function gzprintf() is prone to a buffer overflow if its arguments expand to more then Z_PRINTF_BUFSIZE bytes. A fixed version of zlib will be shipped with future SuSE Linux versions. - vnc VNC (Virtual Network Computing) uses a weak cookie generation process which can be exploited by an attacker to bypass authentication. New packages are currently being tested and will be available on our FTP servers soon. ______________________________________________________________________________ 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 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@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@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 announcements 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 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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Charter: http://lists.netsys.com/full-disclosure-charter.html