From draht@suse.de Wed Sep 6 17:08:19 2000 From: Roman Drahtmueller To: BUGTRAQ@SECURITYFOCUS.COM Date: Wed, 6 Sep 2000 19:38:20 +0200 Subject: [BUGTRAQ] SuSE Security Announcement: screen [The following text is in the "ISO-8859-1" character set] [Your display is set for the "US-ASCII" character set] [Some characters may be displayed incorrectly] -----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: screen Date: Wednesday, September 6th, 2000 19:35 MEST Affected SuSE versions: 5.3, 6.0, 6.1, 6.2, 6.3, 6.4, 7.0 Vulnerability Type: local root compromise Severity (1-10): 8 SuSE default package: yes Other affected systems: all linux systems with the screen program installed suid root Content of this advisory: 1) security vulnerability resolved: screen problem description, discussion, solution and upgrade information 2) pending vulnerabilities, temporary workarounds 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information screen, a tty multiplexer, is installed suid root by default on SuSE Linux distributions. By supplying a thoughtfully designed string as the visual bell message, local users can obtain root privilege. Exploit information has been published on security forums. The temporary workaround for this problem would be to remove the suid bit from /usr/bin/screen*. This also requires mode changes in the /tmp/screens directory where the pipes for communication between the client and server part of screen are placed upon start of screen. SuSE provides an update for the vulnerable screen package. It is strongly recommended to upgrade to the latest version found on our ftp server as described below. The update packages remove all currently known security problems in the glibc package. Download the update package from locations desribed below and install the package with the command `rpm -Fhv 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/ap1/screen-3.9.8-1.i386.rpm 84b6330f0b9ac7600cc5ec53a9dfdbe9 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/screen-3.9.8-1.src.rpm 883d80abf603a4eab2238a4e857301e2 SuSE-6.4 ftp://ftp.suse.com/pub/suse/i386/update/6.4/ap1/screen-3.9.8-0.i386.rpm 52f451ce0c8c49e02311dd16961aa028 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/screen-3.9.8-0.src.rpm a3cb0fb2c90664c6deb986fcbf4e74fd SuSE-6.3 ftp://ftp.suse.com/pub/suse/i386/update/6.3/ap1/screen-3.9.8-0.i386.rpm 2c244140d346b16a3d5fb77e2cf1f860 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/screen-3.9.8-0.src.rpm 2c84eadb44a5694dc3088000fff5ec82 SuSE-6.2 ftp://ftp.suse.com/pub/suse/i386/update/6.2/ap1/screen-3.9.8-0.i386.rpm a72973a281467a1b390453ba2cbf3b59 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.2/zq1/screen-3.9.8-0.src.rpm a379e5b4ca81cf4118002c3064d1c3da SuSE-6.1 ftp://ftp.suse.com/pub/suse/i386/update/6.1/ap1/screen-3.9.8-0.i386.rpm d64479b7ba3740299acf717fe36c3834 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/6.1/zq1/screen-3.9.8-0.src.rpm e0b08bc5887c40d9f6e3176936c7150b SuSE-6.0 Please use the update packages from the 6.1 directory for SuSE-6.0! SuSE-5.3 ftp://ftp.suse.com/pub/suse/i386/update/5.3/ap1/screen-3.9.8-0.i386.rpm cd3ef3bc018973d8907000a8a23bafb6 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/5.3/zq1/screen-3.9.8-0.src.rpm f94c9664219649a2f2100344a88cdd22 Sparc Platform: SuSE-7.0 ftp://ftp.suse.com/pub/suse/sparc/update/7.0/ap1/screen-3.9.8-0.sparc.rpm 3adce8a1bcf2464266d5db728b8d8af9 source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/screen-3.9.8-0.src.rpm 26b1186598be0f873732fa5bf7b7b77b AXP Alpha Platform: SuSE-6.4 ftp://ftp.suse.com/pub/suse/axp/update/6.4/ap1/screen-3.9.8-0.alpha.rpm aa64d979f33d3c03b5bc0c5074892df8 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/screen-3.9.8-0.src.rpm 11f2261b54e8a329c8b0d1bfd9d0c96f SuSE-6.3 ftp://ftp.suse.com/pub/suse/axp/update/6.3/ap1/screen-3.9.8-0.alpha.rpm 8e5acd8e3fe9efa7d82e2710489c7300 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/screen-3.9.8-0.src.rpm 6a1c04d9dd4f8c351e189a38f6f5d614 SuSE-6.1 ftp://ftp.suse.com/pub/suse/axp/update/6.1/ap1/screen-3.9.8-0.alpha.rpm 54828e3e9f0c72cc022fb35660c687e8 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/6.1/zq1/screen-3.9.8-0.src.rpm e1ff18f05b40afa7849e7d07ae5b8755 PPC Power PC Platform: SuSE-6.4 ftp://ftp.suse.com/pub/suse/ppc/update/6.4/ap1/screen-3.9.8-0.ppc.rpm 7418b948cf1e92622814c8aae3fa9aa6 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/screen-3.9.8-0.src.rpm 25c8979ec0f63f09a3e39cdadf2ef657 SuSE-6.3 ftp://ftp.suse.com/pub/suse/ppc/update/6.3/ap1/screen-3.9.8-0.ppc.rpm ea459ccb8c91b293e8b2b321df39be89 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/6.3/zq1/screen-3.9.8-0.src.rpm aa87f61ec2fa912be6c83711c0630129 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: This section addresses currently known vulnerabilities in Linux/Unix systems that have not been resolved yet as of the release date of this advisory. - zope SuSE distributions before 7.0 do not contain zope as a package. An updated package for the freshly released SuSE-7.0 is on the way. - xchat A fix for the URL handler vulnerabilty is in progress and will be released within a few days. There is currently no effective and easy workaround other than removing the package by hand (`rpm -e xchat'). More information on xchat can be found in xchat's documentation directory /usr/doc/packages/xchat or /usr/share/doc/packages/xchat for SuSE-7.0. ______________________________________________________________________________ 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 . 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 . =============================================== Regards, Roman Drahtmüller. - - -- - - | Roman Drahtmüller // "Caution: Cape does | SuSE GmbH - Security Phone: // not enable user to fly." | Nürnberg, Germany +49-911-740530 // (Batman Costume warning label) | - - ______________________________________________________________________________ The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. SuSE GmbH makes no warranties of any kind whatsoever with respect to the information contained in this security advisory. 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