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______________________________________________________________________________
SuSE Security Announcement
Package: ncurses Announcement-ID: SuSE-SA:2000:043 Date: Friday, October 27th, 2000 17:00 MEST Affected SuSE versions: 6.0, 6.1, 6.2, 6.3, 6.4, 7.0 Vulnerability Type: local root compromise Severity (1-10): 5 SuSE default package: yes Other affected systems: systems with suid binaries linked against ncurses
Content of this advisory: 1) security vulnerability resolved: ncurses 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 ncurses library is used by many text/console based applications such as mail user agents, ftp clients and other command line utilities. A vulnerability has been found by Jouko Pynnönen <jouko@solutions.fi> in the screen handling functions: Insufficient boundary checking leads to a buffer overflow if a user supplies a specially drafted terminfo database file. If an ncurses-linked binary is installed setuid root, it is possible for a local attacker to exploit this hole and gain elevated privileges.
There are several ways to fix the problem associated with the library. One of them would be to fix the library. However, it is not considered unlikely that another problem (similar to the one that has just been found) will be revealed in the future. Therefore, it is advisable to not link setuid applications against the ncurses library. As a permanent and cleaner fix, we do not provide update packages for the ncurses library, but we suggest to change the modes of the relevant setuid applications. There are three setuid-root applications contained in SuSE-distributions: xaos (suid root for permissions to use SVGAlib on the Linux console) screen (does not need root privs in the latest version) cda, contained in the xmcd program, a command line CD player. It might need elevated privileges to access the cdrom device file.
The script attached to the email with this announcement changes the modes of files in the SuSE distribution that match both criteria necessary to exploit the buffer overflow in the ncurses library: 1) the binary is setuid root, 2) it is linked against libncurses. Please save the attachment under the name "perms-ncurses.sh" and execute it using the command `bash ./perms-ncurses.shŽ. It does: a) Check your version of the screen program installed. b) Changes /etc/permissions and /etc/permissions.easy to reflect the mode changes. The original files are saved, see /etc/permissions.* . (note: The chkstat program is being executed by SuSEconfig, the SuSE configuration script, to set the modes of files according to the entries in the permission files. The files being used are /etc/permissions, /etc/permissions.local and /etc/permissions.easy unless the administrator changed the settings in /etc/rc.config .) c) Changes the file modes by hand by executing chmod 755 /usr/X11R6/lib/X11/xmcd/bin-Linux-$ARCH/cda \ /usr/bin/screen /usr/bin/xaos
You can download the script from the following location:
ftp://ftp.suse.com/pub/suse/noarch/perms-ncurses.sh md5sum: abe22607d45ecdb710f6061d5bbd3d13
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
A summary about ongoing issues will be included in the next security announcement. ______________________________________________________________________________
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-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>. ===============================================
Regards, Roman Drahtmueller. -- - - | Roman Drahtmueller <draht@suse.de> // "Caution: Cape does | SuSE GmbH - Security Phone: // not enable user to fly." | Nuernberg, 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.
Type Bits/KeyID Date User ID pub 2048/3D25D3D9 1999/03/06 SuSE Security Team <security@suse.de>
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