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Red Hat 6.2: RHSA-2001:014-03 Critical: Vixie-Cron Buffer Overflow

New vixie-cron packages are available that fix a buffer overflow in the 'crontab' command; this could allow certain users to gain elevated privileges.. ` --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: New vixie-cron packages available Advisory ID: RHSA-2001:014-03 Issue date: 2001-02-12 Updated on: 2001-02-19 Product: Red Hat Linux Keywords: vixie-cron buffer overflow username crontab Cross references: Obsoletes: --------------------------------------------------------------------- 1. Topic: New vixie-cron packages are available that fix a buffer overflow in the 'crontab' command; this could allow certain users to gain elevated privileges. It is recommended that all users update to the fixed packages. Users of Red Hat Linux 6.0 or 6.1 should use the packages for Red Hat Linux 6.2. 2. Relevant releases/architectures: Red Hat Linux 5.2 - alpha, i386, sparc Red Hat Linux 6.2 - alpha, i386, sparc Red Hat Linux 7.0 - alpha, i386 3. Problem description: A buffer overflow existed in the 'crontab' command; if called by a user with a username longer than 20 characters. If the system administrator has created usernames of that length, it would be possible for those users to gain elevated privileges. 4. Solution: To update all RPMs for your particular architecture, run: rpm -Fvh where is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directly *only* contains the desired RPMs. Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in theappropriate RPMs being upgraded on your system. 5. Bug IDs fixed ( for more info): 6. RPMs required: Red Hat Linux 5.2: SRPMS: alpha: i386: sparc: Red Hat Linux 6.2: SRPMS: alpha: i386: sparc: Red Hat Linux 7.0: SRPMS: alpha: i386: 7. Verification: MD5 sum Package Name -------------------------------------------------------------------------- 3a89bffb76e4f6aa4b2f2642ba043bc7 5.2/SRPMS/vixie-cron-3.0.1-38.5.2.src.rpm 4ba62d6f55d8bbeb47e57b0a9464701b 5.2/alpha/vixie-cron-3.0.1-38.5.2.alpha.rpm 5827b0be32d899fdad229e225cbd4782 5.2/i386/vixie-cron-3.0.1-38.5.2.i386.rpm 73906a21d198cbf255c724fab8de9a21 5.2/sparc/vixie-cron-3.0.1-38.5.2.sparc.rpm e037d33b2c605b054308b543613c9b52 6.2/SRPMS/vixie-cron-3.0.1-40.1.src.rpm e0ab2bc7b094d65971a3acae39379e20 6.2/alpha/vixie-cron-3.0.1-40.1.alpha.rpm 12d0cc89ca909ac56774e136af0442b5 6.2/i386/vixie-cron-3.0.1-40.1.i386.rpm 4b9249539b22b0671577d738b64c4d58 6.2/sparc/vixie-cron-3.0.1-40.1.sparc.rpm 16fbd0ee65609ab35c96699089604870 7.0/SRPMS/vixie-cron-3.0.1-61.src.rpm b0cfceed1c6d1df1229f434d7adec14d 7.0/alpha/vixie-cron-3.0.1-61.alpha.rpm 13707ef913e7801da32f9d47a419f81b 7.0/i386/vixie-cron-3.0.1-61.i386.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: Copyright(c) 2000, 2001 Red Hat, Inc. `. Latest modifications in vixie-cron tackle a security flaw in the crontab utility, pivotal for safeguarding user access permissions.. vixie-cron, buffer overflow, red hat packages, crontab command, security advisory. . Severity: Critical. LinuxSecurity.com Team

Feb 19, 2001 •Critical Red Hat