From chmouel@MANDRAKESOFT.COM Thu Jul 13 01:12:18 2000 From: Chmouel Boudjnah To: BUGTRAQ@SECURITYFOCUS.COM Date: Sun, 4 Jun 2000 21:44:17 +0200 Subject: Linux-Mandrake Xlockmore security update [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] ------------------------------------- Linux-Mandrake Security Update ------------------------------------- Package: xlockmore Affected versions: 6.1, 7.0 Problem: Xlock is an X11 utility used to lock X-Window displays until the password of the user running X is entered correctly. Of course, in order to perform the password-check xlock must be setuid root and have access to the shadowed passwd file. In the xlockmore distributions versions prior to 4.16.1, a buffer overflow vulnerability was present in xlock that permitted a user to view parts of the shadowed passwd file. This is achieved by overwriting (with an oversized -mode argument) a global variable storing a pointer to a string printed in the "usage" output. The pointer would be overwritten with an address pointing to the shadowed passwd data. With the long argument, xlock would find and an error in the command syntax and exit, printing the usage information (along with the shadowed passwd text). Please upgrade to: md5sum: 614600a41689677da12287b950c2708a package: 6.1/RPMS/xlockmore-4.16.1-1mdk.i586.rpm md5sum: d0a6a3bf840b4d3ea347892f8df1896e source: 6.1/SRPMS/xlockmore-4.16.1-1mdk.src.rpm md5sum: 82ea685b6c467a55fce37490286763ae package: 7.0/RPMS/xlockmore-4.16.1-1mdk.i586.rpm md5sum: d0a6a3bf840b4d3ea347892f8df1896e source: 7.0/SRPMS/xlockmore-4.16.1-1mdk.src.rpm To upgrade automatically, use « MandrakeUpdate ». If you want to upgrade manually, download the updated package from one of our FTP server mirrors and uprade with "rpm -Uvh package_name". All mirrors are listed on http://www.mandrake.com/en/ftp.php3 Updated packages are available in the "updates/" directory. For example, if you are looking for an updated RPM package for Mandrake 7.0, look for it in: updates/7.0/RPMS/ Note: we give the md5 sum for each package. It lets you check the integrity of the downloaded package by running the md5sum command on the package ("md5sum package.rpm"). -- MandrakeSoft Inc http://www.mandrakesoft.com --Chmouel