SuSE Security Announcement: xmcd (SuSE-SA:2001:025)
-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: xmcd Announcement-ID: SuSE-SA:2001:025 Date: Friday, Aug 3rd 2001 18:30 MEST Affected SuSE versions: (6.0, 6.1, 6.2,) 6.3, 6.4, 7.0, 7.1, 7.2 Vulnerability Type: local privilege escalation Severity (1-10): 4 SuSE default package: no Other affected systems: yes Content of this advisory: 1) security vulnerability resolved: yes 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 Cda, a setuid commandline part of xmcd, a X11/Motif audio CD player by Ti Kan <ti@amb.org>, was found vulnerable by a link attack and some bufferoverflows. These bugs could be exploited by an adversary, who has access to the system, to overwrite files or gain higher privileges. As a temporary fix, just remove the setuid bit from cda: /bin/chmod 755 /usr/X11R6/bin/cda or let just trusted users execute cda: /bin/chown root.trusted /usr/X11R6/bin/cda /bin/chmod 4750 /usr/X11R6/bin/cda Don't forget to add these changes to your /etc/permissions.local file Users of SuSE 7.2 with permissions.secure or permissions.paranoid activated are safe, because setuid is already removed. Thanks to Paul Starzetz <paul@starzetz.de>, who reportes the link attack and to Ti Kan <ti@amb.org>, the author of xmcd, for his fast response and help. New RPMs can be found at the following places. i386 Intel Platform: SuSE-7.2 ftp://ftp.suse.com/pub/suse/i386/update/7.2/snd2/xmcd-2.6-195.i386.rpm 2e11b84704ab44c61b04f2e9bfde1371 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/xmcd-2.6-195.src.rpm 2d934ab9662d3aee69041d2118ead682 SuSE-7.1 ftp://ftp.suse.com/pub/suse/i386/update/7.1/snd2/xmcd-3.0.2-2.i386.rpm dbeb8ddbf8e435d54930d1acef85cfe6 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/xmcd-3.0.2-2.src.rpm 38c24dc21572cfefc3f678bb534457e7 SuSE-7.0 ftp://ftp.suse.com/pub/suse/i386/update/7.0/snd2/xmcd-3.0.2-2.i386.rpm 55ef501823f33033d6e649a6df872cf7 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/xmcd-3.0.2-2.src.rpm 6ba4db1799355aef6fe5202164338b5d SuSE-6.4 ftp://ftp.suse.com/pub/suse/i386/update/6.4/snd2/xmcd-3.0.2-2.i386.rpm 8f0dd51c4ed7b9dabd554793a98504f3 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/xmcd-3.0.2-2.src.rpm 076151818b5054d40d955bdf060f601b SuSE-6.3 ftp://ftp.suse.com/pub/suse/i386/update/6.3/snd2/xmcd-3.0.2-2.i386.rpm a53b36543b555ad435eebede89324227 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/xmcd-3.0.2-2.src.rpm 4274da4334b67a04d10f2ade67305679 Sparc Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/sparc/update/7.1/snd2/xmcd-3.0.2-0.sparc.rpm b6fb5c9a71c578866fcefd978c3dd469 source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/xmcd-3.0.2-0.src.rpm 0c6a783486669cc57b35575edabfd6b4 SuSE-7.0 ftp://ftp.suse.com/pub/suse/sparc/update/7.0/snd2/xmcd-3.0.2-0.sparc.rpm b7ae66325a2875e97d28ec7b0152dc35 source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/xmcd-3.0.2-0.src.rpm 836be977435960908c77d753c47084fb AXP Alpha Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/axp/update/7.1/snd2/xmcd-3.0.2-2.alpha.rpm b2c1652b694655fbd5635b455355fe59 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/xmcd-3.0.2-2.src.rpm 78af000c592f274fa78019da47463c2f SuSE-7.0 ftp://ftp.suse.com/pub/suse/axp/update/7.0/snd2/xmcd-3.0.2-3.alpha.rpm 67a11e69a66ee0e5c36f8bd4c67d1e49 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/xmcd-3.0.2-3.src.rpm 17fa48bdd3b20c263c09578391a6da2e SuSE-6.4 ftp://ftp.suse.com/pub/suse/axp/update/6.4/snd2/xmcd-3.0.2-4.alpha.rpm c0ee2188da89b7756e143495b2947a41 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/xmcd-3.0.2-4.src.rpm 39acbbe4d54c671f925b342091f4b994 SuSE-6.3 ftp://ftp.suse.com/pub/suse/axp/update/6.3/snd2/xmcd-3.0.2-4.alpha.rpm 5480828717020d146da0d9413ab8fab8 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/xmcd-3.0.2-4.src.rpm 5a5d4af61d0b4ce629ad19a06d8dcd2b PPC PowerPC Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/ppc/update/7.1/snd2/xmcd-3.0.2-3.ppc.rpm 3292bb4e6410aa1d5268fca8540024af source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/xmcd-3.0.2-3.src.rpm f6ddf546fa6562ac02d7b56fde58ea11 SuSE-7.0 ftp://ftp.suse.com/pub/suse/ppc/update/7.0/snd2/xmcd-3.0.2-3.ppc.rpm 4bd49ef46dbf59a9155af6322a4a34c3 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/xmcd-3.0.2-3.src.rpm 67762f89ddeec6eb4a99a5919ad35927 SuSE-6.4 ftp://ftp.suse.com/pub/suse/ppc/update/6.4/snd2/xmcd-3.0.2-3.ppc.rpm 295884a4eb13da364b6a8f0b3ae2f69d source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/xmcd-3.0.2-3.src.rpm 185fd215007d17348e11982bbc2c2ad1 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - openssl Currently we check are checking the dependencies of openssl to other dynamic or static linked applications on SuSE Linux. An announcement will be released soon. - 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 ftp://ftp.suse.com/pub/suse/<arch>/<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. - 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. - 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. - 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. - 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. - 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 <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 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 . - 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 annoucements 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>. The <security@suse.com> 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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participants (1)
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Thomas Biege