From thomas@suse.de Wed Nov 13 09:36:31 2002 From: Thomas Biege To: bugtraq@securityfocus.com Date: Tue, 12 Nov 2002 14:06:45 +0100 (CET) Subject: SuSE Security Announcement: SuSE-SA:2002:043 (traceroute-nanog/nkitb) -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: traceroute-nanog/nkitb Announcement-ID: SuSE-SA:2002:043 Date: Tuesday, Nov 12th 2002 09:30 MEST Affected products: 7.0, 7.1, 7.2, 7.3, 8.0 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 Connectivity Server SuSE Linux Enterprise Server 7 SuSE Linux Office Server Vulnerability Type: local root Severity (1-10): 4 SuSE default package: yes Cross References: none Content of this advisory: 1) security vulnerability resolved: - dropping root after gaining raw socket - a few buffer overflows 2) pending vulnerabilities, solutions, workarounds: - ypserv - horde - openssh - wrong MD5 sums in advisory SuSE-SA:2002:041 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information Traceroute is a tool that can be used to track packets in a TCP/IP network to determine it's route or to find out about not working routers. Traceroute-nanog requires root privilege to open a raw socket. It does not relinquish these privileges after doing so. This allows a malicious user to gain root access by exploiting a buffer overflow at a later point. For all products prior to 8.1, the traceroute package contains the NANOG implementation. This package is installed by default. Starting with 8.1, SuSE Linux contains a traceroute program rewritten by Olaf Kirch that does not require root privileges anymore. This version of traceroute is not vulnerable. This is the first update for the traceroute package on the SuSE Linux distributions 7.1 through 8.0. We have changed the version string in the update packages to read "6.x" instead of the former "nanog_6.x" to enable a clean comparison between version numbers. This change is misleading in that it suggests that the package name has been changed. Since only the version string is affected, the name of the package remains the same. As a workaround you can remove the setuid bit or just allow trusted users to execute traceroute-nanog. Become root and add the following line to /etc/permissions.local: "/usr/sbin/traceroute root.trusted 4750" This line will keep the setuid root bit for /usr/sbin/traceroute and just allow users in group trusted to execute the binary. To make the permission change and keep it permanent you have to run chkstat(8): "chkstat -set /etc/permissions.local" 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. Missing packages are being built and tested and will be available for download soon. Intel i386 Platform: SuSE-8.0: ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/traceroute-6.1.1-0.i386.rpm afe01bf0b151eca2f42fa5737c99bdc7 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/traceroute-6.1.1-0.src.rpm ee35e7cf554daa37a3976f473d4192f1 SuSE-7.3: ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/traceroute-6.1.1-0.i386.rpm 0ef0c0153532fcefdf776311503e590b source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/traceroute-6.1.1-0.src.rpm 15a9f3dba6339f0a0bb57ce17d2d9894 SuSE-7.2: ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/traceroute-6.1.1-0.i386.rpm 3b9acb72a3208e3e4e92c0df8ab8d46f source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/traceroute-6.1.1-0.src.rpm a6fd1c7dc3bea4d08ef1efdcbc30fff6 SuSE-7.1: ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/traceroute-6.0-0.i386.rpm 1ac8de3a6e54451bae8e3068f2fbd1e9 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/traceroute-6.0-0.src.rpm 291036123b377184fdf0231d6878f57d SuSE-7.0: ftp://ftp.suse.com/pub/suse/i386/update/7.0/a1/nkitb-2002.11.6-0.i386.rpm b1105bc6916a5fdbd54db63d52ec3d81 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/nkitb-2002.11.6-0.src.rpm 3061bd5e551995d62c96da133927a612 Sparc Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/traceroute-6.1.1-0.sparc.rpm 638b868bedab639292d740e60cd0b266 source rpm(s): ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/traceroute-6.1.1-0.src.rpm 10a996ae6a2b4b739bca8f5e9d65e2da AXP Alpha Platform: SuSE-7.1: ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/traceroute-6.0-0.alpha.rpm f2d241cd2331bb3de3382b338fba50b8 source rpm(s): ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/traceroute-6.0-0.src.rpm 949737f63fe99b4476b9c325bdc966fc SuSE-7.0: ftp://ftp.suse.com/pub/suse/axp/update/7.0/a1/nkitb-2002.11.6-0.alpha.rpm 04a5746b70af2e99f8a31b86e16cb470 source rpm(s): ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/nkitb-2002.11.6-0.src.rpm 83abbae6c15ee25adc702047d41a6564 PPC Power PC Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/traceroute-6.1.1-0.ppc.rpm a00ed346efdc8992b6cf92b890dcc7db source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/traceroute-6.1.1-0.src.rpm 8bfd655104212afc745ea998f0fe6d84 SuSE-7.1: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/traceroute-6.0-0.ppc.rpm 0dc4fa991f1b6a2260af694b9b73ff1a source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/traceroute-6.0-0.src.rpm 9e60c951a66e635cab2aa46559f4aa4e SuSE-7.0: ftp://ftp.suse.com/pub/suse/ppc/update/7.0/a1/nkitb-2002.11.6-0.ppc.rpm eb7d62c5e6ae971a6a96d8a475b8d9fb source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/nkitb-2002.11.6-0.src.rpm c4b5a31e58a91b5dbd0b6ba497e69046 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - horde There was a cross-site scripting vulnerability in horde. Updated packages have been released for 7.3, 8.0 and 8.1. - openssh When the SSH daemon finds that a user's password has expired, the user is forced to set a new password. While doing so, sshd did not turn off the terminal echo, causing the password to be visible on the screen as it was typed. We are in the process of releasing updated package for 7.0 through 7.3. SuSE Linux 8.0 and 8.1 are not affected. - ypserv Thorsten Kukuk found a memory leak in ypserv that caused it to lose small amounts of memory each time it processes certain malformed requests. This could be used by an attacker to kill ypserv by repeating this exercise until it runs out of memory. We have released updated packages for 7.0 through 8.0. SuSE Linux 8.1 is not affected. - wrong MD5 sums in advisory SuSE-SA:2002:041 Due to a mistake the SuSE Security Announcement SuSE-SA:2002:041 (perl-Mailtools) contains wrong MD5 sums. A new version will be published on our security web sites 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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