_____________________________________________________________________________________________ TurboLinux Security Announcement Package: vixie-cron Vulnerable Packages: All Turbolinux versions previous to 3.0.1-46 Date: 05/02/2001 5:00 PDT Affected TurboLinux versions: TL Server 6.5, TL 6.1 WorkStation, All TurboLinux versions 6.0.5 and earlier TurboLinux Advisory ID#: TLSA2001012 Credits: Vulnerability first discovered by flatline References: http://marc.theaimsgroup.com/?l=bugtraq&m=98200814418344&w=2 _____________________________________________________________________________________________ A security hole has been discovered in the package vixie-cron. Please update the packages in your installation as soon as possible. _____________________________________________________________________________________________ 1. Problem Summary There is a buffer overflow vulnerability associated with the crontab function. When crontab determines the name of the user calling the crontab function, it stores this name in a 20 byte buffer using the strcpy() function, which does no bounds checking. The command "useradd" accepts more than 20 characters. Therefore, a username greater than 20 characters will crash a system when passed to the crontab function. 2. Impact It is possible for a local user to gain elevated privileges. 3. Solution Update the packages from our ftp server by running the following command: rpm -Uvh ftp_path_to_filename Where ftp_path_to_filename is the following: ftp://ftp.turbolinux.com/pub/updates/6.0/security/vixie-cron-3.0.1-46.i386.rpm The source RPM can be downloaded here: ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/vixie-cron-3.0.1-46.src.rpm **Note: You must rebuild and install the RPM if you choose to download and install the SRPM. Simply installing the SRPM alone WILL NOT CLOSE THE SECURITY HOLE. Please verify the MD5 checksums of the updates before you install: MD5 sum Package Name --------------------------------------------------------------------------------------------- c79c05f0044f88812908b17730a308ee vixie-cron-3.0.1-46.i386.rpm cdfd064650b8839a3d7f3eb18a494165 vixie-cron-3.0.1-46.src.rpm _____________________________________________________________________________________________ These packages are GPG signed by TurboLinux for security. Our key is available here: http://www.turbolinux.com/security/tlgpgkey.asc To verify a package, use the following command: rpm --checksig name_of_rpm To examine only the md5sum, use the following command: rpm --checksig --nogpg name_of_rpm **Note: Checking GPG keys requires RPM 3.0 or higher. ________________________________________________________________________________________________ You can find more updates on our ftp server: ftp://ftp.turbolinux.com/pub/updates/6.0/security/ for TL6.0 Workstation and Server security updates Our webpage for security announcements: http://www.turbolinux.com/security If you want to report vulnerabilities, please contact: security@turbolinux.com ________________________________________________________________________________________________ Subscribe to the TurboLinux Security Mailing lists: TL-security - A moderated list for discussing security issues TurboLinux products. Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security TL-security-announce - An announce-only mailing list for security updates and alerts. Subscribe at: http://www.turbolinux.com/mailman/listinfo/tl-security-announce