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Red Hat 6.x RHSA-2000:053-01 Critical Usermode Command Escalation

Console users can obtain root privileges. ` --------------------------------------------------------------------- Red Hat, Inc. Security Advisory Synopsis: Updated usermode packages. Advisory ID: RHSA-2000:053-01 Issue date: 2000-08-11 Updated on: 2000-08-11 Product: Red Hat Linux Keywords: usermode shutdown Cross references: N/A --------------------------------------------------------------------- 1. Topic: Updated usermode packages are now available for Red Hat Linux 6.0, 6.1, and 6.2. 2. Relevant releases/architectures: Red Hat Linux 6.0 - i386, alpha, sparc Red Hat Linux 6.1 - i386, alpha, sparc Red Hat Linux 6.2 - i386, alpha, sparc Red Hat Linux 6.2E - i386, alpha, sparc 3. Problem description: The usermode package allows unprivileged users logged in at the system console to run the halt, poweroff, reboot, and shutdown commands without needing to know the superuser's password. While being able to halt, poweroff, and reboot is a desirable thing, an unprivileged user can also bring the system to single-user mode by running "shutdown now" with no additional flags. This update removes the "shutdown" command from the list of commands unprivileged users can run. 4. Solution: For each RPM for your particular architecture, run: rpm -Fvh [filename] where filename is the name of the RPM. 5. Bug IDs fixed ( for more info): 13768 - Auth dialogs show "Picture of a key" text instead of graphic 13616 - Missing icon. 12433 - /usr/sbin/userhelper not stripped 11006 - kppp either doesn't display locally or remotely 9746 - Local user can go into single mode only with shutdown now... 6. RPMs required: Red Hat Linux 6.0, 6.1, 6.2: sparc: alpha: i386: sources: 7. Verification: MD5 sum Package Name -------------------------------------------------------------------------- 24f2766589d1a16ebcda912067173396 6.2/SRPMS/usermode-1.28-2.src.rpm 94423f4138477d9d47a055ed3c4b3648 6.2/alpha/usermode-1.28-2.alpha.rpm b8f16bb02c4355a86183e268bd57ac74 6.2/i386/usermode-1.28-2.i386.rpm e1c2b7626a905f64b03f48127e742259 6.2/sparc/usermode-1.28-2.sparc.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at: You can verify each package with the following command: rpm --checksig If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command: rpm --checksig --nogpg 8. References: N/A Copyright(c) 2000 Red Hat, Inc. `. Oracle has issued a swift notice regarding a severe flaw in their database system, mandating the disabling of certain admin commands to mitigate potential data breach threats.. Usermode Access Control, Red Hat Security Update, Usermode Privileges. . Severity: Critical. LinuxSecurity.com Team

Aug 12, 2000 •Critical Red Hat