dhcp/dhcp-server Updates for SUSE Linux
Posted on: 06/23/2004 05:56 AM

Updated dhcp packages are available for SUSE Linux ______________________________________________________________________________ SUSE Security Announcement Package: dhcp/dhcp-server Announcement-ID: SuSE-SA:2004:019 Date: Tuesday, Jun 22st 2004 21:00 MEST Affected products: 8.0, 8.1, 8.2, 9.0, 9.1 SUSE Linux Database Server, SUSE eMail Server III, 3.1 SUSE Linux Enterprise Server 7, 8 SUSE Linux Firewall on CD/Admin host SUSE Linux Connectivity Server SUSE Linux Office Server Vulnerability Type: remote system compromise Severity (1-10): 5 SUSE default package: yes Cross References: VU#317350 VU#654390 Content of this advisory: 1) security vulnerability resolved: buffer overflow problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - icecast - sitecopy - cadaver - OpenOffice_org - tripwire - postgresql - lha - XDM - mod_proxy 3) standard appendix (further information)

______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information The Dynamic Host Configuration Protocol (DHCP) server is used to configure clients that dynamically connect to a network (WLAN hotspots, customer networks, ...). The CERT informed us about a buffer overflow in the logging code of the server that can be triggered by a malicious client by supplying multiple hostnames. The hostname strings are concatenated and copied in a fixed size buffer without checking the buffer bounds. Other possible buffer overflow conditions exist in using vsprintf() instead of vsnprintf(). This behavior can be configured during compile- time. The dhcp/dhcp-server package coming with SUSE LINUX used the vulnerable vsprintf() function. Since SuSE Linux 8.1/SuSE Linux Enterprise Server 8 the DHCP server runs as non-root user in a chroot jail. This setup limits the impact of a successful attack. There is no temporary workaround 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. x86 Platform: SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/dhcp-server-3.0.1rc13-28.15.i586.rpm 6de5ea6efc87a3fcd3ed0ad6b9500a72 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/dhcp-server-3.0.1rc13-28.15.i586.patch.rpm e64d5f02268edf0cd4ecac5e917c2872 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/dhcp-3.0.1rc13-28.15.src.rpm 6be43d62ac4987c21d37bbfaf474d604 SUSE Linux 9.0: ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/dhcp-server-3.0.1rc12-71.i586.rpm 617270aba8651abb59a492bfe9b60018 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/dhcp-server-3.0.1rc12-71.i586.patch.rpm 4a90fa43709f38a2c6b3dbcf591a0adb source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/dhcp-3.0.1rc12-71.src.rpm ac606c8da1f8f4eae538ea110c639432 SUSE Linux 8.2: ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/dhcp-server-3.0.1rc10-61.i586.rpm 28020cc4c5d8a57cf5da5fbb1fcb682c patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/dhcp-server-3.0.1rc10-61.i586.patch.rpm 425546108271103762940ee6407ee03c source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/dhcp-3.0.1rc10-3.src.rpm a0a1ef9fbc13ac94bd9371eea33a6113 SUSE Linux 8.1: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/dhcp-server-3.0.1rc9-144.i586.rpm 77ecf5ffef83bcf36636c1330bdfc4be patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/dhcp-server-3.0.1rc9-144.i586.patch.rpm d505bd9f0787eb1dca75a4b6908d1ce9 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/dhcp-3.0.1rc9-5.src.rpm 877b2bc5e21ad6f4e30968df29cb7c7e SUSE Linux 8.0: ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/dhcp-server-3.0.1rc6-22.i386.rpm efad137cb0835d11f789a0a41de88c85 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/dhcp-server-3.0.1rc6-22.i386.patch.rpm 68d11afae967685d18ed9e4864c29972 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/dhcp-3.0.1rc6-11.src.rpm ae3bfa6b54b824a1283b9acd6b354410 x86-64 Platform: SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/dhcp-server-3.0.1rc13-28.15.x86_64.rpm e0dce22d7d0a67b22e7ee144761ab56d patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/dhcp-server-3.0.1rc13-28.15.x86_64.patch.rpm 9a14ca99e4284e3d91bd7d5e904c1714 source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/dhcp-3.0.1rc13-28.15.src.rpm e7e668a18dff093d7d53f3b5c5ce6a03 SUSE Linux 9.0: ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/dhcp-server-3.0.1rc12-71.x86_64.rpm d054492651ea0fc968d537540e16cb5b patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/dhcp-server-3.0.1rc12-71.x86_64.patch.rpm d073e74b3fe9150108aaf37ab1e2135f source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/dhcp-3.0.1rc12-71.src.rpm b5702a32cb1caad2f8d711a5e88bd97e ______________________________________________________________________________ 2) Pending vulnerabilities in SUSE Distributions and Workarounds: - icecast The icecast service is vulnerable to a remote denial-of-service attack. Update packages will be available soon. - sitecopy The sitecopy package includes a vulnerable version of the neon library (CAN-2004-0179, CAN-2004-0398). Update packages will be available soon. - cadaver The cadaver package includes a vulnerable version of the neon library (CAN-2004-0179, CAN-2004-0398). Update packages will be available soon. - OpenOffice_org The OpenOffice_org package includes a vulnerable version of the neon library (CAN-2004-0179, CAN-2004-0398). Update packages will be available soon. - tripwire A format string bug in tripwire can be exploited locally to gain root permissions. Update packages will be available soon. - postgresql A buffer overflow in psqlODBC could be exploited to crash the application using it. E.g. a PHP script that uses ODBC to access a PostgreSQL database can be utilized to crash the surrounding Apache web-server. Other parts of PostgreSQL are not affected. Update packages will be available soon. - lha Minor security fix for a buffer overflow while handling command line options. This buffer overflow could be exploited in conjunction with other mechanisms to gain higher privileges or access the system remotely. Packages are available now. - XDM/XFree86 This update resolves random listening to ports by XDM that allows to connect via the XDMCP. SUSE LINUX 9.1 is affected only. New packages are currently being tested and will be available soon. - mod_proxy A buffer overflow can be triggered by malicious remote servers that return a negative Content-Length value. This vulnerability can be used to execute commands remotely New packages are currently being tested and will be available 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 <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@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 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-subscribe@suse.com>. 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 <suse-security-announce-subscribe@suse.com>. For general information or the frequently asked questions (faq) send mail to: <suse-security-info@suse.com> or <suse-security-faq@suse.com> respectively. ==================================================================== SUSE's security contact is <security@suse.com> or <security@suse.de>. The <security@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 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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