-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SUSE Security Announcement Package: rsync Announcement-ID: SuSE-SA:2003:050 Date: Thursday, Dec 4th 2003 14:30 MET Affected products: 7.3, 8.0, 8.1, 8.2, 9.0 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: local privilege escalation Severity (1-10): 4 SUSE default package: no Cross References: CAN-2003-0962 Content of this advisory: 1) security vulnerability resolved: heap overflow problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - discontinue of SuSE Linux 7.3 - KDE - mc - apache - screen - mod_gzip - unace 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information The rsync suite provides client and server tools to easily support an administrator keeping the files of different machines in sync. In most private networks the rsync client tool is used via SSH to fulfill his tasks. In an open environment rsync is run in server mode accepting connections from many untrusted hosts with, but mostly without, authentication. The rsync server drops its root privileges soon after it was started and per default creates a chroot environment. Due to insufficient integer/bounds checking in the server code a heap overflow can be triggered remotely to execute arbitrary code. This code does not get executed as root and access is limited to the chroot environment. The chroot environment maybe broken afterwards by abusing further holes in system software or holes in the chroot setup. Your are not vulnerable as long as you do not use rsync in server mode or you use authentication to access the rsync server. As a temporary workaround you can disable access to your rsync server for untrusted parties, enable authentication or switch back to rsync via SSH. 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-9.0: ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/rsync-2.5.6-193.i586.rpm e848708286572c8a793819e5a358274a patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/rsync-2.5.6-193.i586.patch.rpm d70f7726a2c8850a8c085bdbe9afbf27 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/rsync-2.5.6-193.src.rpm 45e14417a64704fcee1dfea390a5b3f6 SuSE-8.2: ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/rsync-2.5.6-193.i586.rpm 341d1da31000831d994e48d0714b576d patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/rsync-2.5.6-193.i586.patch.rpm d94f1a84fc07e92dfc87471f909314c9 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/rsync-2.5.6-193.src.rpm 16b19cc2331ff577f2d1f9e116e74625 SuSE-8.1: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/rsync-2.5.5-258.i586.rpm 28799a5950666eb7f104e2831575fb3c patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/rsync-2.5.5-258.i586.patch.rpm 02557d2de1dc27ffd97845ebabb336b6 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/rsync-2.5.5-258.src.rpm 6a7cd73509acf3cca12d9a4f4b3aec98 SuSE-8.0: ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/rsync-2.4.6-499.i386.rpm cf9fde4bcf1f3af3e3c5ae6bf5ceba85 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/rsync-2.4.6-499.i386.patch.rpm 0a61425e9bb345fe73e42926408257cb source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/rsync-2.4.6-499.src.rpm d5c29841ff1f387cb003c359eee868df SuSE-7.3: ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/rsync-2.4.6-499.i386.rpm 67b2400ee15d739e75a1463db7d003ca source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/rsync-2.4.6-499.src.rpm ececccdf316a4d98c66315fc560eb9b1 Sparc Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/rsync-2.4.6-190.sparc.rpm bd408eb2cfe82206439c78a1fbaecf60 source rpm(s): ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/rsync-2.4.6-190.src.rpm e500422c7cf0dc39c6bb3cf2445d9998 SuSE-7.3: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/rsync-2.4.6-309.ppc.rpm 7eebb018bce237a4f351f5e00761ead1 source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/rsync-2.4.6-309.src.rpm 2dd16900d70cbf06454dcd52b822a0ae ______________________________________________________________________________ 2) Pending vulnerabilities in SUSE Distributions and Workarounds: - discontinue of SuSE Linux 7.3 Two years after the release, SUSE will discontinue providing updates and security fixes for the SuSE Linux 7.3 consumer product on the Intel i386 and the PPC Power PC architectures. Vulnerabilities found after December 15th 2003 will not be fixed any more for SuSE Linux 7.3. Directory structures referring to the SuSE Linux 7.3 release will be moved to the discontinued/ tree on our main ftp server ftp.suse.com the distribution directories first, followed by the update/ directory tree in January 2004. Please note that our SuSE Linux Enterprise Server family products have a much longer support period. These products are not concerned by this announcement. - KDE New KDE packages are currently being tested. These packages fixes several vulnerabilities: + remote root compromise (CAN-2003-0690) + weak cookies (CAN-2003-0692) + SSL man-in-the-middle attack + information leak through HTML-referrer (CAN-2003-0459) + wrong file permissions of config files The packages will be release as soon as testing is finished. - mc By using a special combination of links in archive-files it is possible to execute arbitrary commands while mc tries to open it in its VFS. The packages are currently tested and will be release as soon as possible. - apache1/2 The widely used HTTP server apache has several security vulnerabilities: - locally exploitable buffer overflow in the regular expression code. The attacker must be able to modify .htaccess or httpd.conf. (affects: mod_alias and mod_rewrite) - under some circumstances mod_cgid will output its data to the wrong client (affects: apache2) Update packages are available on our FTP servers. - freeradius Two vulnerabilities were found in the FreeRADIUS package. The remote denial-of-service attack bug was fixed and new packages will be released as soon as testing was successfully finished. The other bug is a remote buffer overflow in the module rlm_smb. We do not ship this module and will fix it for future releases. - screen A buffer overflow in screen was reported. Since SuSE Linux 8.0 we do not ship screen with the s-bit anymore. An update package will be released for 7.3 as soon as possible. - mod_gzip The apache module mod_gzip is vulnerable to remote code execution while running in debug-mode. We do not ship this module in debug-mode but future versions will include the fix. Additionally the mod_gzip code was audited to fix more possible security related bugs. - unace The tool unace for handling the archive format ACE is vulnerable to a buffer overflow that can be triggered with long file-names as command line argument. This only affects unace version 2.5. Unfortunately this tool is provided closed source only from the author. Therefore we are unable to check for other bugs or look at the patch. Update packages are available from 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 <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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-----END PGP PUBLIC KEY BLOCK----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (GNU/Linux) iQEVAwUBP89p3ney5gA9JdPZAQEHywf7BVUbgRFR++QVCq2qt8930XR1OH0XbLkf oUhKnhyC025asQHEe0mF9PYFXIz5s+vFwYWVP68qheAvmQic2HH4qotv29wdSIP7 EXb8ilGcdDGnaZLaFk6473O1TV2vT/JMYB3RGYnnsDV+PXCDrzc5vL29IUjlpaFA IC+B1Y5nhMCpIRQ5NBnWBx+u00QPS44mXLZmHHtaj+60rSuIjv2n63sNg1jhXczL lja5Y3hNOLzuLJyPv62n4LffGCPdXk9deMyxOfkl8RBfu+Q0PEJmKD18PQOyPRjE 1hdMdBgwEz8BAbgr5YaNllKn1a09KV7TzlB+KbY02M8XTGnGd+MFUw== =mvKr -----END PGP SIGNATURE----- Bye, Thomas -- Thomas Biege <thomas@suse.de>, SUSE LINUX AG, Security Support & Auditing -- # If you have the "driftnet" program installed, webcollage can display a # collage of images sniffed off your local ethernet, instead of pulled out # of search engines: in that way, your screensaver can display the images # that your co-workers are downloading! -- xscreensaver source-code