Unsichere Verwendung eines Programmaufrufs in modprobe
ID: | SuSE-SA:2000:44 |
Distribution: | SUSE |
Plattformen: | Keine Angabe |
Datum: | Mo, 13. November 2000, 12:00 |
Referenzen: | Keine Angabe |
Applikationen: | modutils |
Originalnachricht |
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-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: modules Announcement-ID: SuSE-SA:2000:44 Date: Monday, November 13th, 2000 10:00 MEST Affected SuSE versions: 6.4, 7.0 Vulnerability Type: local root compromise Severity (1-10): 8 SuSE default package: yes Other affected systems: many newer Linux distributions Content of this advisory: 1) security vulnerability resolved: modprobe shell metacharacter expansion 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 The modules package is responsible for on-demand loading of kernel modules/drivers. The /sbin/modprobe command, when executed as a new task by the kernel-internal function request_module(), runs with the priviledges of the init process, usually root. Newer versions of the modprobe program contain a bug which allows local users to gain root priviledges. modprobe expands given arguments via /bin/echo and can easily be tricked into executing commands. In order for this bug to be exploitable, a setuid root program must be installed that can trigger the loading of modules (such as ping6). The fix for this bug consists of a change to modprobe which disables the expansion of arguments to modprobe via /bin/echo. A temporary workaround for this bug is to disable the automatic loading of modules in the running kernel by running the command (as root) /sbin/sysctl -w kernel.modprobe=/ or echo "/" > /proc/sys/kernel/modprobe Please note that this temporary workaround will have to be repeated after the next reboot to become effective again. Download the update package from locations desribed below and install the package with the command `rpm -Uhv file.rpm'. The md5sum for each file is in the line below. You can verify the integrity of the rpm files using the command `rpm --checksig --nogpg file.rpm', independently from the md5 signatures below. i386 Intel Platform: SuSE-7.0 ftp://ftp.suse.com/pub/suse/i386/update/7.0/a1/modules-2.3.11-73.i386.rpm 9643216a1e0c147635ef62d894a9d7ad source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/modules.spm Due to a packaging error, the modules package source rpm is not available on our ftp servers yet. It will appear at the location above in very few hours. SuSE-6.4 ftp://ftp.suse.com/pub/suse/i386/update/6.4/a1/modules-2.3.9-63.i386.rpm d3a95b93e549aae9a462e84d179efe45 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/modules.spm Due to a packaging error, the modules package source rpm is not available on our ftp servers yet. It will appear at the location above in very few hours. Sparc Platform: SuSE-7.0 ftp://ftp.suse.com/pub/suse/sparc/update/7.0/a1/modules-2.3.11-73.sparc.rpm c0ab9aab7a61cefdb2cade98c663d4e3 source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/modules.spm Due to a packaging error, the modules package source rpm is not available on our ftp servers yet. It will appear at the location above in very few hours. AXP Alpha Platform: SuSE-6.4 ftp://ftp.suse.com/pub/suse/axp/update/6.4/a1/modules-2.3.9-63.alpha.rpm a88b84d7f3d79f2a47ff9e78681a0390 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/modules.spm Due to a packaging error, the modules package source rpm is not available on our ftp servers yet. It will appear at the location above in very few hours. PPC Power PC Platform: SuSE-7.0: ftp://ftp.suse.com/pub/suse/ppc/update/7.0/a1/modules-2.3.11-73.ppc.rpm ef09b5c6438a0de8e18653e0a60d9c4c source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/modules.spm Due to a packaging error, the modules package source rpm is not available on our ftp servers yet. It will appear at the location above in very few hours. SuSE-6.4 ftp://ftp.suse.com/pub/suse/ppc/update/6.4/a1/modules-2.3.9-63.ppc.rpm 27ba13500292c44969dd865f0c543c19 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/modules.spm Due to a packaging error, the modules package source rpm is not available on our ftp servers yet. It will appear at the location above in very few hours. ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: A seperate message is being prepared to address the currently ongoing security vulnerabilites. ______________________________________________________________________________ 3) standard appendix: 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 |