[suse-security-announce] SuSE Security Announcement: samba (SuSE-SA:2001:021)

-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: samba Announcement-ID: SuSE-SA:2001:021 Date: Friday, Jun 29th 2001 14:45 MEST Affected SuSE versions: (6.0, 6.1, 6.2) 6.3, 6.4, 7.0, 7.1, 7.2 Vulnerability Type: possible remote root compromise Severity (1-10): 7 SuSE default package: yes Other affected systems: systems using samba and the %m macro in the samba main config file Content of this advisory: 1) security vulnerability resolved: samba problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information Michal Zalewski discovered that a remote attacker can write to files owned by root if the samba config file /etc/smb.conf contains the %m macro to specify the logfile for logging access to the samba server. The %m macro substitutes the NetBIOS name - improper validation of this name allows an attacker to write to any file in the system. SuSE Linux distributions do not ship a default /etc/smb.conf config file that contains the %m macro. Therefore, SuSE distributions are not vulnerable to the bug in the out-of-the-box state. In addition to the remotely exploitable bug, there exists another vulnerability which is fixed with the update packages we provide below: temporary files are being handled insecurely so that an attacker with local access to the system can increase her privileges. This error was discovered by Marcus Meissner, Caldera. This specific problem has been fixed with the release of the samba-2.0.9 version. samba release version 2.0.8 intended to correct this local problem, but due to an error, 2.0.9 contained the complete fix. Only the 2.0.10 version as offered for the SuSE Linux distributions 6.3, 6.4, 7.0 and 7.1 fixes all known problems in the samba package. For the recently released SuSE-7.2 distribution we provide an update package to the version 2.2.0a. We thank Martin Walter, CC university of Freiburg, for his helpful contribution in debugging the Large File Support (LSF) of the 7.1 package. NOTES: * We have removed the samba packages from the update trees for the 6.0, 6.1 and 6.2 distributions on our ftp-server. These packages would introduce security risks if installed on a host. * The samba source rpm package in distributions after and including 7.0 generates both the samba.rpm and the smbclnt.rpm package. It is recommended to update both packages for these distributions. <p> Please download the update package from locations described below and check the authenticity of the rpm package file using a method as described in section 3 of this security announcement. Use the command 'rpm -Uhv file.rpm' to apply the update. Special installation instructions: =================================== After successful installation of the update package, it is necessary to restart the samba server. To do this, use the following command rcsmb restart as root. <p> i386 Intel Platform: SuSE-7.2 ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/samba-2.2.0a-0.i386.rpm d0cab6f5d34645dc9e41f2ae0aed8a30 ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/smbclnt-2.2.0a-0.i386.rpm aba5da72a8175c2119e82d01184dd320 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/samba-2.2.0a-0.src.rpm 243964fad8bda61039020acf7a13858f SuSE-7.1 ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/samba-2.0.10-0.i386.rpm da1232db9259196a58e7e3b46065e8c8 ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/smbclnt-2.0.10-0.i386.rpm a497089893fd375986ab5a031eddaf05 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/samba-2.0.10-0.src.rpm 07705a9cacb7f9f28b434a1e6a6fe3bb SuSE-7.0 ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/samba-2.0.10-0.i386.rpm a20a0241fad9b3381758946e9f9ae16d ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/smbclnt-2.0.10-0.i386.rpm c0194e29ff9f6ae5da8500f6a6250bab source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/samba-2.0.10-0.src.rpm e412b83bbf653023cadbf163a3ec296f SuSE-6.4 ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/samba-2.0.10-0.i386.rpm e740834c08f1a91efed8abfe1ffd1fd1 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/samba-2.0.10-0.src.rpm ed22708ec5fbc14cfdfc0cd45b3033e0 SuSE-6.3 ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/samba-2.0.10-0.i386.rpm da6aeaf7043bc03199e4c1d5c04d3be6 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/samba-2.0.10-0.src.rpm 84e325fc575143a576c42f386c88e44c <p><p> Sparc Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n2/samba-2.0.10-0.sparc.rpm 5b702a797836de3352c96b0b33297d13 ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n1/smbclnt-2.0.10-0.sparc.rpm 00c29e2ff26d00b60a81e095a78623c7 source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/samba-2.0.10-0.src.rpm 1d9d41cfeab79ef851cb4666a0259731 SuSE-7.0 ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/samba-2.0.10-0.sparc.rpm 48ef896322723e4247b13db719a6d593 ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/smbclnt-2.0.10-0.sparc.rpm fdacfbe34e46919515dc54d288b6e56a source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/samba-2.0.10-0.src.rpm b023db5df4e6b26ed8263d61de3c9915 <p><p><p> AXP Alpha Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/samba-2.0.10-0.alpha.rpm 3302ca10f2e779ff168d44bc4280158a ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/smbclnt-2.0.10-0.alpha.rpm 440ff9a0fefb54ac85977e4598e39eed source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/samba-2.0.10-0.src.rpm 49f109c06957f200cd5112dc872273fc SuSE-7.0 ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/samba-2.0.10-0.alpha.rpm 6e68f4d9156238874755bd9bac59d713 ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/smbclnt-2.0.10-0.alpha.rpm c1935910e75c956ed8b2ce9e4c324d55 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/samba-2.0.10-0.src.rpm 210dde7e938ff7d1d303e80a13d11673 SuSE-6.4 ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/samba-2.0.10-0.alpha.rpm 9d6cf089b447ba4aefe1d70cf2771a22 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/samba-2.0.10-0.src.rpm 377b183857e179772481840caffd7db4 SuSE-6.3 ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/samba-2.0.10-0.alpha.rpm e4871d1a0423bec9999fde9a9b85ab23 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/samba-2.0.10-0.src.rpm 51cf42a086a4a26619323311660dbfb8 <p><p> PPC Power PC Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/samba-2.0.10-0.ppc.rpm dfaa395540e2e01b3ccc7177f0f297c4 ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/smbclnt-2.0.10-0.ppc.rpm ca9059bfbafe4553ae6bc79dad70ce31 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/samba-2.0.10-0.src.rpm df603b78073673c7f8988639b1cb2c1e SuSE-7.0 ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/samba-2.0.10-0.ppc.rpm 65b2d0e71902afb4f3cafa67f2d5c628 ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/smbclnt-2.0.10-0.ppc.rpm a1de2eb26df810831f65af2feb0f12f9 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/samba-2.0.10-0.src.rpm 17777fa091391825ebd9d90018f950bf SuSE-6.4 ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/samba-2.0.10-0.ppc.rpm 4e44aaab59f3c624e77b83bbbc05bb18 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/samba-2.0.10-0.src.rpm 5893c01a4f1ddf8f8d2e77ac8ee785e9 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - Location of update packages on ftp.suse.de/ftp.suse.com: Licensing problems as well as US crypto-software export regulations keep us from publishing update packages that contain cryptographical software on ftp.suse.com, our US ftp server. Bandwith requirements keep us from moving the server to our German location. For these reasons, crypto-packages for SuSE Linux distributions before SuSE-7.1 can be obtained from the equivalent tree on ftp.suse.de. Distributions after and including SuSE-7.1 have their crypto-packages hosted on ftp.suse.com. This was possible with some efforts to remove all non-free cryptographical algorithms from our packages. <p> - qpopper In our last security announcement (SuSE-SA:2001:020 gpg/gnupg) we announced that we investigate the buffer overflow that has been found in qpopper versions before 4.0.3. SuSE Linux distributions are not affected by this bug because a different version is being used. <p> - dqs dex@raza-mexicana.org has found an exploitable buffer overflow bug in the dsh program from the dqs package on SuSE Linux distributions. To workaround the problem, do "chmod -s /usr/bin/dsh" and change the files /etc/permissions* to reflect the change. If you do not need the dqs package, then deinstall it (rpm -e dqs). Packages for most of the supported SuSE Linux distributions are available at the usual location <a href="ftp://ftp.suse.com/pub/suse/<arch">ftp://ftp.suse.com/pub/suse//<dist> for download and installation/update. Do not forget to change the files /etc/permissions* to remove the suid-bit from the dsh program. Please note that we will not issue a dedicated security announcement for this specific bug. <p> - pcp Paul Starzetz discovered a security weakness in the setuid root program /usr/share/pcp/bin/pmpost. The common library in pcp trusts the environment that has been supplied by the user, regardless of privileged execution or not. By consequence, a user can specify the configuration file and therefore write to files owned by root. The problem is not based on insecurely following symlinks as stated by Paul Starzetz. The pcp package is not installed by default in SuSE Linux distributions. We have provided update packages for the SuSE Linux distributions version 7.1 and 7.2 that remove the setuid bit from the pmpost binary. Versions before SuSE-7.1 were not affected because the setuid bit was not set. We thank Keith Owens and Mark Goodwin from Silicon Graphics for responding quickly and for publishing a new version of the pcp package which will be included in future releases of the SuSE Linux distribution. For more information see the /usr/share/doc/packages/pcp directory of your SuSE Linux installation after installing the update package, or go to obtained from http://oss.sgi.com/projects/pcp/download . Please note that there will not be a dedicated security announcement for this specific bug. <p> - xinetd A buffer overflow has been found in xinetd, all versions, all SuSE Linux distributions. It may be abused to remotely attack a host running xinetd. The xinetd package is not installed by default in SuSE Linux distributions. Manual interaction must have been applied to run the daemon. Update packages can be found at the usual location on our ftp server. The security announcement for this security problem is underway. <p> - fetchmail (fetchml) New fetchmail packages are available on the ftp server. The packages cure a buffer overflow that can be exploited by sending a victim a specially designed email, waiting for the victim's fetchmail program to pick up the email. We are preparing a security announcement for this problem. <p> - openssh update packages for the openssh package after (and including) SuSE-6.4 are available on our ftp servers ftp.suse.de (for < 7.1) or ftp.suse.com (for >= 7.1). We are currently checking for a non-security related irregularity in sshd's behaviour under faulty setup conditions. <p> - exim SuSE Linux distributions do not contain the exim Mail Transport Agent (See http://www.exim.org/ for details) and are therefore not susceptible to the recently found security-related bugs. <p> - webmin SuSE Linux distributions do not contain the webmin administration web frontend (See http://www.webmin.org/ for details) and are therefore not vulnerable to the recently found security-related problems in the software. ______________________________________________________________________________ 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 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 toplevel directory of the first CD (pubring.gpg) and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de . <p> - 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 . 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 cleartext signature shows proof of the authenticity of the text. SuSE GmbH makes no warranties of any kind whatsoever with respect to the information contained in this security advisory. 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