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Red Hat Linux RHSA-2001:045-05 Critical: Ntpd Buffer Overflow Threat

The Network Time Daemon (xntpd on Red Hat Linux 6.2 and earlier, ntpd on Red Hat Linux 7.0) does not properly check the size of a buffer used to hold incoming data from the network.. ` --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: Network Time Daemon (ntpd) has potential remote root exploit Advisory ID: RHSA-2001:045-05 Issue date: 2001-04-05 Updated on: 2001-04-08 Product: Red Hat Linux Keywords: ntpd exploit buffer overflow Cross references: Obsoletes: --------------------------------------------------------------------- 1. Topic: The Network Time Daemon (ntpd) supplied with all releases of Red Hat Linux is vulnerable to a buffer overflow, allowing a remote attacker to potentially gain root level access to a machine. All users of ntpd are strongly encouraged to upgrade. 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: The Network Time Daemon (xntpd on Red Hat Linux 6.2 and earlier, ntpd on Red Hat Linux 7.0) does not properly check the size of a buffer used to hold incoming data from the network. Potentially, an attacker could gain root access by exploiting this weakness. Potential damage is mitigated by the fact that the Network Time Daemon is not enabled by default. If you are not using network time services, it may not even be installed. As a general rule, Red Hat encourages users to enable only those network services they actually need. 4. Solution: To update all RPMs for your particular architecture, run: rpm -Fvh [filenames] where [filenames] 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 the appropriate RPMs being upgraded on your system. 5. Bug IDs fixed ( for more info): 34813 - ntpd security hole 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 -------------------------------------------------------------------------- 0d3566d34cd5bc9990a15a41be99e4c7 5.2/en/os/SRPMS/xntp3-5.93-14.src.rpm aa851fdb72e9f6464e9688378617c9df 5.2/en/os/alpha/xntp3-5.93-14.alpha.rpm 176041bd0364ca91b6d7db3869c4a0a0 5.2/en/os/i386/xntp3-5.93-14.i386.rpm 9b224d8bd3640a6fbd37785c6c5d3ce2 5.2/en/os/sparc/xntp3-5.93-14.sparc.rpm a83add134f54dd4fbdcfd0cef5929b43 6.2/en/os/SRPMS/xntp3-5.93-15.src.rpm 64d936dcf1fa8fe97a12b314923ae89c 6.2/en/os/alpha/xntp3-5.93-15.alpha.rpm af43bc024a00586ef97265c7bf2e63df 6.2/en/os/i386/xntp3-5.93-15.i386.rpm 3f13de81debf2dc875d84c046596e27d 6.2/en/os/sparc/xntp3-5.93-15.sparc.rpm b7f60c57e74179913ebc2dc1da04f410 7.0/en/os/SRPMS/ntp-4.0.99k-15.src.rpm 6334b7ba31606cfe04d98967adbf3350 7.0/en/os/alpha/ntp-4.0.99k-15.alpha.rpm f67d135fd6ccadb9f36aeca4a429a9fa 7.0/en/os/i386/ntp-4.0.99k-15.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: BugTraq Message-ID ntp.org: Home of the Network Time Protocol Copyright(c) 2000, 2001 Red Hat, Inc. [Already at end of message] `. Critical advisory for Red Hat users on exploiting ntpd vulnerability requiring immediate update for server safety.. Red Hat Linux, NTPD Exploit, Buffer Overflow, Remote Access Threat. . Severity: Critical. LinuxSecurity.com Team

Apr 08, 2001 •Critical Red Hat