===================================================================== CERT-Renater Note d'Information No. 2004/VULN490 _____________________________________________________________________ DATE : 17/11/2004 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Systems running samba. ====================================================================== ______________________________________________________________________________ SUSE Security Announcement Package: samba Announcement-ID: SUSE-SA:2004:040 Date: Monday, Nov 15th 2004 18:00 MEST Affected products: 9.1, 9.2 SUSE Linux Enterprise Server 9 Novell Linux Desktop 9 Vulnerability Type: potential remote buffer overflow remote denial of service Severity (1-10): 7 SUSE default package: yes Cross References: CAN-2004-0930 CAN-2004-0882 Content of this advisory: 1) security vulnerabilities resolved: - remote buffer overflow and remote denial of service conditions in Samba 3 packages. problem description 2) solution/workaround 3) special instructions and notes 4) package location and checksums 5) pending vulnerabilities, solutions, workarounds: - bogofilter - libxml2 - clamav - various PDF viewers - mozilla /tmp issues - sharutils - phpMyAdmin - gaim - sysconfig - perl-MIME-Tools, perl-Archive-ZIP - apache / mod_include - apache2 / mod_SSL 6) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion There is a problem in the Samba file sharing service daemon, which allows a remote user to have the service consume lots of computing power and potentially crash the service by querying special wildcarded filenames. This attack can be successful if the Samba daemon is running and a remote user has access to a share (even read only). The Samba team has issued the new Samba version 3.0.8 to fix this problem, this update backports the relevant patch. This issue has been assigned the Mitre CVE ID CAN-2004-0930. Stefan Esser found a problem in the Unicode string handling in the Samba file handling which could lead to a remote heap buffer overflow and might allow remote attackers to inject code in the smbd process. This issue has been assigned the Mitre CVE ID CAN-2004-0882. We provide updated packages for both these problems. The Samba version 2 packages are not affected by this problem. 2) solution/workaround Update to the released packages. The only workaround would be not to use Samba. 3) special instructions and notes Restart the Samba daemon by entering the following command as root: rcsmb try-restart 4) package location and checksums 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 for installation from the maintenance web. x86 Platform: SUSE Linux 9.2: ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/samba-3.0.7-5.2.i586.rpm ea47b14d991eadfc8319d248441eb6cc patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/samba-3.0.7-5.2.i586.patch.rpm 097048624c2ca75d66113c994e278bf8 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/samba-3.0.7-5.2.src.rpm e90db6a68fca1660ecb1f3e833034b14 SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/samba-3.0.4-1.34.3.i586.rpm 2701bcc3f8a702828a84ca6ee6f58c47 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/samba-3.0.4-1.34.3.i586.patch.rpm 2ec25548844d0741ece92ea34726b962 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/samba-3.0.4-1.34.3.src.rpm ce60179f36ea0005df7c69b64849b387 x86-64 Platform: SUSE Linux 9.2: ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/samba-3.0.7-5.2.x86_64.rpm 13b65db6a9cd46df94cd5171d4c3b916 patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/samba-3.0.7-5.2.x86_64.patch.rpm 0e7dd46cc7187ae3a7419dfdb8cdd1b8 source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/samba-3.0.7-5.2.src.rpm e90db6a68fca1660ecb1f3e833034b14 SUSE Linux 9.1: ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/samba-3.0.4-1.34.3.x86_64.rpm 8b442529ac042ecea469972c2c85e4b5 patch rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/samba-3.0.4-1.34.3.x86_64.patch.rpm f3c95f1940f05652393a178b6a12e226 source rpm(s): ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/samba-3.0.4-1.34.3.src.rpm 053403aa610ea0df5b6337934e753acc ______________________________________________________________________________ 5) Pending vulnerabilities in SUSE Distributions and Workarounds: A lot of less important issues have been addressed since the last security update. To avoid spamming they are summarized here. - bogofilter The bogofilter team has notified us about a denial of service condition in bogofilter on SUSE Linux 9.2, where a non-conformant encoded word could lead to a denial of service attack against bogofilter. This issue has been assigned Mitre CVE ID CAN-2004-1007. Fixed packages are available. - libxml2 Several buffer overflows in URL handling in libxml2 were found by "infamous41md". This issue has been assigned the Mitre CVE ID CAN-2004-0989. Fixed packages are available. - clamav The clamav version shipped with SUSE Linux is too old for the new data files. The version has been upgraded to 0.80. - various xpdf based PDF viewers The SUSE QA team found several 64-bit issues in the xpdf fixes we released for CAN-2004-0888 and CAN-2004-0889. These have been fixed and updated packages have been released. - Mozilla /tmp issues The creation of several /tmp files in Mozilla and Mozilla based programs left private files with world readable permissions so that local users could read documents of other users. Packages fixing this problem have been released. - sharutils Buffer overflows and shell quoting problems have been found in the "shar" program which creates self-extracting shell archives. Fixed packages are available. - phpMyAdmin Missing parameter escapes allowed users of the phpMyAdmin frontend to execute commands as the www user on the target host. Fixed packages are available. - gaim More problems in newer versions of GAIM have been found and are tracked with the Mitre CVE ID CAN-2004-0891. Fixed packages are available. - sysconfig A permission error left the passphrase of WPA authorized wireless key world readable in SUSE Linux 9.2. Fixed packages are available. - perl-Mime-Tools / perl-Archive-ZIP Problems in the perl-MIME-Tools and perl-Archive-ZIP packages have been found which could allow virii to pass virus scanners using those packages (like for instance clamav). Fixed packages are in testing and will be released soon. - Apache 1.3 / mod_include A potential buffer overflow and a argument sanitization problem were found in the mod_include Apache 1.3 module. These issues are tracked as CAN-2004-0940 and CAN-2004-0492 by Mitre CVE. Fixed packages are in testing and will be released soon. - Apache 2 / mod_SSL SSL Ciphersuite bypass problems were identified and fixed by the Apache team in Apache 2. This is tracked under the Mitre CVE ID CAN-2004-0885. Fixed packages are in testing and will be released soon. ______________________________________________________________________________ 6) 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 recommend against subscribing to security lists that cause the e-mail 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 file name of the rpm package that you have downloaded. Of course, package authenticity verification can only target an uninstalled 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. Type Bits/KeyID Date User ID pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 151 bd de l'Hopital | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================