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Slackware: 2005-255-02 Critical: Util-Linux Umount Escalation

New util-linux packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, and -current to fix a security issue with umount. A bug in the '-r' option could allow flags in /etc/fstab to be improperly dropped on user-mountable volumes, allowing a user to gain root privileges. . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 [slackware-security] util-linux umount privilege escalation (SSA:2005-255-02) New util-linux packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, and -current to fix a security issue with umount. A bug in the '-r' option could allow flags in /etc/fstab to be improperly dropped on user-mountable volumes, allowing a user to gain root privileges. For more details, see David Watson's post to BugTraq: Here are the details from the Slackware 10.1 ChangeLog: +--------------------------+ patches/packages/util-linux-2.12p-i486-2.tgz: Patched an issue with umount where if the umount failed when the '-r' option was used, the filesystem would be remounted read-only but without any extra flags specified in /etc/fstab. This could allow an ordinary user able to mount a floppy or CD (but with nosuid, noexec, nodev, etc in /etc/fstab) to run a setuid binary from removable media and gain root privileges. Reported to BugTraq by David Watson: (* Security fix *) +--------------------------+ Where to find the new packages: +-----------------------------+ Updated package for Slackware 8.1: ftp://ftp.slackware.com/pub/slackware/slackware-8.1/patches/packages/util-linux-2.11r-i386-3.tgz Updated package for Slackware 9.0: ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/util-linux-2.11z-i386-2.tgz Updated package for Slackware 9.1: ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/util-linux-2.12-i486-2.tgz Updated package for Slackware 10.0: ftp://ftp.slackware.com/pub/slackware/slackware-10.0/patches/packages/util-linux-2.12a-i486-2.tgz Updated package for Slackware10.1: ftp://ftp.slackware.com/pub/slackware/slackware-10.1/patches/packages/util-linux-2.12p-i486-2.tgz Updated package for Slackware -current: MD5 signatures: +-------------+ Slackware 8.1 package: 3b3025faf0a40428f2861fa2967c13d3 util-linux-2.11r-i386-3.tgz Slackware 9.0 package: 41b08961548899ca10fa93d16a7ab516 util-linux-2.11z-i386-2.tgz Slackware 9.1 package: 4890b834bac6d7490c1daf5bc7bbff55 util-linux-2.12-i486-2.tgz Slackware 10.0 package: 3e628cf4d6db843a1dd63e2fa7f3aba1 util-linux-2.12a-i486-2.tgz Slackware 10.1 package: 01722ab0146969c6cde9f99698864606 util-linux-2.12p-i486-2.tgz Slackware -current package: 21e318a9f04dc6588916945713312bf3 util-linux-2.12p-i486-2.tgz Installation instructions: +------------------------+ Upgrade the package as root: # upgradepkg util-linux-2.12p-i486-2.tgz +-----+ . Updated util-linux distributions address umount security vulnerabilities in Slackware environments. Safeguard your system integrity now!. util-linux updates, slackware patch, privilege escalation fix. . Severity: Critical. LinuxSecurity.com Team

Sep 13, 2005 •Critical Slackware