-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: tcpdump Announcement-ID: SuSE-SA:2000:46 Date: Friday, November 17th, 2000 16:00 MEST Affected SuSE versions: 6.0, 6.1, 6.2, 6.3, 6.4, 7.0 Vulnerability Type: remote denial of service Severity (1-10): 6 SuSE default package: yes Other affected systems: systems using the same versions of tcpdump and the necessary libraries Content of this advisory: 1) security vulnerability resolved: tcpdump problem description, discussion, solution and upgrade information 2) clarification, pending vulnerabilities, solutions, workarounds 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information tcpdump is a widespread network/packet analysis tool, also known as a packet sniffer, used in unix/unix-like environment. Several overflowable buffers have been found in SuSE's version of tcpdump that could allow a remote attacker to crash the local tcpdump process. Since tcpdump may be used in combination with intrusion detection systems, a crashed tcpdump process may disable the network monitoring system as a whole. The FreeBSD team who found these vulnerabilities also reported that tcpdump's portion of code that can decode AFS ACL (AFS=Andrew File System, a network filesystem, ACL=Access Control List) packets is vulnerable to a (remotely exploitable) buffer overrun attack that could allow a remote attacker to execute arbitrary commands as root since the tcpdump program usually requires root privileges to gain access to the raw network socket. The versions of tcpdump as shipped with SuSE distributions do not contain the AFS packet decoding capability and are therefore not vulnerable to this second form of attack. A temporary workaround for the tcpdump problems other than not using tcpdump in the first place does not exist. However, we provide update packages for the affected SuSE distributions. We recommend an upgrade using the packages that can be found using the URLs below. Note: Please note that there is only one source rpm package but two binary rpm packages. tcpdump*.rpm is the rpm for the tcpdump program, and libpcapn*.rpm is the packet capture library that is required by tcpdump at compile time. In order to remove the security vulnerability in tcpdump, it is necessary to update the tcpdump rpm package only. The libpcapn package with the static library is provided for consistency and compatibility because it will be generated if the binary packages are rebuilt from the source rpm. To check if your system has the vulnerable package installed, use the command `rpm -q <package name>´. If applicable, please choose the update package(s) for your distribution from the URLs listed below and download the necessary rpm files. Then, install the package using the command `rpm -Uhv file.rpm´. rpm packages have an internal md5 checksum that protects against file corruption. You can verify this checksum using the command (independently from the md5 signatures below) `rpm --checksig --nogpg file.rpm', The md5 sums under each package are to prove the package authenticity, independently from the md5 checksums in the rpm package format. i386 Intel Platform: SuSE-7.0 ftp://ftp.suse.com/pub/suse/i386/update/7.0/d1/libpcapn-0.4a6-279.i386.rpm f4e4a9231b695e1cf5eef0ad09871c34 ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/tcpdump-3.4a6-280.i386.rpm ba711cf2fab14218752603fa5a941721 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/tcpdump-3.4a6-280.src.rpm d4c5902c50d6a321e2c4ed665fcd1962 SuSE-6.4 ftp://ftp.suse.com/pub/suse/i386/update/6.4/d1/libpcapn-0.4a6-279.i386.rpm a1030d64ca4ca86a08b6bee5dc9cff78 ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/tcpdump-3.4a6-280.i386.rpm 12335bf0055c6a9b915044a95a544aaa source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/tcpdump-3.4a6-280.src.rpm dca26c3e5ef81f449cd43ab4d1f91b63 SuSE-6.3 ftp://ftp.suse.com/pub/suse/i386/update/6.3/d1/libpcapn-0.4a6-279.i386.rpm 13c90044ed57792090163a33ffb69ecf ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/tcpdump-3.4a6-280.i386.rpm 646de6c14a2d4988d0c684a42b4eef58 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/tcpdump-3.4a6-280.src.rpm 46980acd95607d4a9c61ca0f75c33fc2 SuSE-6.2 ftp://ftp.suse.com/pub/suse/i386/update/6.2/d1/libpcapn-0.4a6-279.i386.rpm d058e563ad10daf078f5909a6b8ff288 ftp://ftp.suse.com/pub/suse/i386/update/6.2/n1/tcpdump-3.4a6-280.i386.rpm f5209f1f1433b0a55676f29451a2ef1b source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.2/zq1/tcpdump-3.4a6-280.src.rpm cd34cd3feedbe0568d76dd9a406cec79 SuSE-6.1 ftp://ftp.suse.com/pub/suse/i386/update/6.1/d1/libpcapn-0.4a6-279.i386.rpm ef454e2d23e410be82aa9f0634bcc9dc ftp://ftp.suse.com/pub/suse/i386/update/6.1/n1/tcpdump-3.4a6-280.i386.rpm 9f6ebff316039421ee00121a0e8720fa source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.1/zq1/tcpdump-3.4a6-280.src.rpm d1148813da9610f940ecdbd462ab2541 SuSE-6.0 Please use the package for the SuSE-6.1 distribution. Sparc Platform: SuSE-7.0 ftp://ftp.suse.com/pub/suse/sparc/update/7.0/d1/libpcapn-0.4a6-279.sparc.rpm 412a7db34985555705d8d43f2853ae4e ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/tcpdump-3.4a6-280.sparc.rpm a177326150a65d78212cebba90b88201 source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/tcpdump-3.4a6-280.src.rpm 49f1f0420dd84070dcd9a67452770e75 AXP Alpha Platform: SuSE-6.4 ftp://ftp.suse.com/pub/suse/axp/update/6.4/d1/libpcapn-0.4a6-279.alpha.rpm 096522f46ab70d92dda17b4ca33b4181 ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/tcpdump-3.4a6-280.alpha.rpm 84ca9a93a2201f7046446ed07107cbbc source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/tcpdump-3.4a6-280.src.rpm 07ed654ad1693dca5fd433572b3689c9 SuSE-6.3 ftp://ftp.suse.com/pub/suse/axp/update/6.3/d1/libpcapn-0.4a6-280.alpha.rpm 747c22bb722da5df7fe3cfc252bdc545 ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/tcpdump-3.4a6-281.alpha.rpm dbe10ebc95a2371d01df729af265bdf6 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/tcpdump-3.4a6-281.src.rpm 8f6e48e693fc465c1f60b6cee944c27c PPC Power PC Platform: SuSE-7.0 ftp://ftp.suse.com/pub/suse/ppc/update/7.0/d1/libpcapn-0.4a6-279.ppc.rpm 140b95ffb3be2c2915327d4798b16dd0 ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/tcpdump-3.4a6-280.ppc.rpm 7f71b4ac17e3ad2c071e712c137a7c28 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/tcpdump-3.4a6-280.src.rpm d9db0e99e91d8981efebafd6a539566f SuSE-6.4 ftp://ftp.suse.com/pub/suse/ppc/update/6.4/d1/libpcapn-0.4a6-279.ppc.rpm ed8697842867cbb5457c03015c117131 ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/tcpdump-3.4a6-280.ppc.rpm 782dc3faba33cf1b2d9e6ef95caf4107 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/tcpdump-3.4a6-280.src.rpm 318bf758753d9728f101de2101ad3227 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: Clarification: In my message (Subject: "SuSE: miscellaneous"), dated Wed, 15 Nov 2000, concerning the paragraph about runtime linking problems in gs (GhostScript) , I have stated that the problem will be fixed in future versions of the SuSE distribution. This does not touch the fact that we will of course provide fixes for the older distributions. - pine We're still working on the packages for the version 4.30 (stability problems). - ppp The ppp "deny_incoming" problem as announced by FreeBSD Security Advisory FreeBSD-SA-00:70.ppp-nat is FreeBSD specific and does not affect the SuSE distribution. - vixie cron Michal Zalewski reported security problems in Paul Vixie's cron implementation that is commonly used in Linux distributions. Due to correct permissions on the directory /var/spool/cron, the SuSE cron package is not affected by the problem. ______________________________________________________________________________ 3) standard appendix: 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 . =============================================== Regards, Roman Drahtmüller. - - -- - - | Roman Drahtmüller // "Caution: Cape does | SuSE GmbH - Security Phone: // not enable user to fly." | Nürnberg, Germany +49-911-740530 // (Batman Costume warning label) | - - ______________________________________________________________________________ The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. SuSE GmbH makes no warranties of any kind whatsoever with respect to the information contained in this security advisory. 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