__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Center ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Red Hat Linux "rsync" Vulnerability [Red Hat Security Advisory RHSA-2002:018-10] January 31, 2002 18:00 GMT Number M-035 ______________________________________________________________________________ PROBLEM: The "rsync" package contains several signed/unsigned bugs in its I/O functions which are remotely exploitable. PLATFORM: Red Hat Linux 6.2 - alpha, i386, sparc Red Hat Linux 7.0 - alpha, i386 Red Hat Linux 7.1 - alpha, i386, ia64 Red Hat Linux 7.2 - i386, ia64 DAMAGE: A remote user can crash the "rsync" server/client and execute code as the user running the "rsync" server or client. SOLUTION: It is strongly recommended that all users of "rsync" upgrade to the fixed packages. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. The "rsync" tool is used for mirroring ASSESSMENT: directory structures across machines and is widely used. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/m-035.shtml ORIGINAL BULLETIN: https://www.redhat.com/support/errata/RHSA-2002-018.html ______________________________________________________________________________ [***** Start Red Hat Security Advisory RHSA-2002:018-10 *****] --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: New rsync packages available Advisory ID: RHSA-2002:018-10 Issue date: 2002-01-23 Updated on: 2002-01-30 Product: Red Hat Linux Keywords: rsync signed unsigned daemon Cross references: Obsoletes: --------------------------------------------------------------------- 1. Topic: New rsync packages are available; these fix a remotely exploitable problem in the I/O functions. These include the security patch from the recently released rsync-2.5.2. It is strongly recommended that all users of rsync upgrade to the fixed packages. 2002-01-28: There was an error in the original bugfix patch for the security problem - the new rsync could fail under some circumstances. This has been fixed in a new build. 2. Relevant releases/architectures: Red Hat Linux 6.2 - alpha, i386, sparc Red Hat Linux 7.0 - alpha, i386 Red Hat Linux 7.1 - alpha, i386, ia64 Red Hat Linux 7.2 - i386, ia64 3. Problem description: rsync is a powerful tool used for mirroring directory structures across machines. rsync has been found to contain several signed/unsigned bugs in its I/O functions which are remotely exploitable. A remote user can crash the rsync server/client and execute code as the user running the rsync server or client. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2002-0048 to this issue. All users of rsync should upgrade their packages. In addition rsync server administrators should consider using the "use chroot", "uid", and "read only" options, which can significantly reduce the impact of a security problem in rsync or elsewhere. Thanks go to Sebastian Krahmer for providing a patch for this vulnerability and to Andrew Tridgell and Martin Pool for their rapid response. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. 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 directory *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 (http://bugzilla.redhat.com/bugzilla for more info): 58874 - New rsync package corrupts files during transfer. 58878 - rsync segfaults 6. RPMs required: Red Hat Linux 6.2: SRPMS: ftp://updates.redhat.com/6.2/en/os/SRPMS/rsync-2.4.6-1.6.src.rpm alpha: ftp://updates.redhat.com/6.2/en/os/alpha/rsync-2.4.6-1.6.alpha.rpm i386: ftp://updates.redhat.com/6.2/en/os/i386/rsync-2.4.6-1.6.i386.rpm sparc: ftp://updates.redhat.com/6.2/en/os/sparc/rsync-2.4.6-1.6.sparc.rpm Red Hat Linux 7.0: SRPMS: ftp://updates.redhat.com/7.0/en/os/SRPMS/rsync-2.4.6-10.src.rpm alpha: ftp://updates.redhat.com/7.0/en/os/alpha/rsync-2.4.6-10.alpha.rpm i386: ftp://updates.redhat.com/7.0/en/os/i386/rsync-2.4.6-10.i386.rpm Red Hat Linux 7.1: SRPMS: ftp://updates.redhat.com/7.1/en/os/SRPMS/rsync-2.4.6-10.src.rpm alpha: ftp://updates.redhat.com/7.1/en/os/alpha/rsync-2.4.6-10.alpha.rpm i386: ftp://updates.redhat.com/7.1/en/os/i386/rsync-2.4.6-10.i386.rpm ia64: ftp://updates.redhat.com/7.1/en/os/ia64/rsync-2.4.6-10.ia64.rpm Red Hat Linux 7.2: SRPMS: ftp://updates.redhat.com/7.2/en/os/SRPMS/rsync-2.4.6-10.src.rpm i386: ftp://updates.redhat.com/7.2/en/os/i386/rsync-2.4.6-10.i386.rpm ia64: ftp://updates.redhat.com/7.2/en/os/ia64/rsync-2.4.6-10.ia64.rpm 7. Verification: MD5 sum Package Name -------------------------------------------------------------------------- 3b33976775af0d04ce639915e5c7cb63 6.2/en/os/SRPMS/rsync-2.4.6-1.6.src.rpm 418e264b0ba45fb9d16deff259e462c4 6.2/en/os/alpha/rsync-2.4.6-1.6.alpha.rpm 441409bda25e79567d4a587994b84d76 6.2/en/os/i386/rsync-2.4.6-1.6.i386.rpm 35abb7066b5e5b7092465c33dd24085d 6.2/en/os/sparc/rsync-2.4.6-1.6.sparc.rpm ec10c0deb84328cc553449f4330f1cfd 7.0/en/os/SRPMS/rsync-2.4.6-10.src.rpm b756d3ddf8b2d34d5fe7c6b1a4c1d043 7.0/en/os/alpha/rsync-2.4.6-10.alpha.rpm 2e37e09c1f55d4d825e748a4a2005698 7.0/en/os/i386/rsync-2.4.6-10.i386.rpm ec10c0deb84328cc553449f4330f1cfd 7.1/en/os/SRPMS/rsync-2.4.6-10.src.rpm b756d3ddf8b2d34d5fe7c6b1a4c1d043 7.1/en/os/alpha/rsync-2.4.6-10.alpha.rpm 2e37e09c1f55d4d825e748a4a2005698 7.1/en/os/i386/rsync-2.4.6-10.i386.rpm 7895ca8e94476fe4868c07dad2f079ae 7.1/en/os/ia64/rsync-2.4.6-10.ia64.rpm ec10c0deb84328cc553449f4330f1cfd 7.2/en/os/SRPMS/rsync-2.4.6-10.src.rpm 2e37e09c1f55d4d825e748a4a2005698 7.2/en/os/i386/rsync-2.4.6-10.i386.rpm 7895ca8e94476fe4868c07dad2f079ae 7.2/en/os/ia64/rsync-2.4.6-10.ia64.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at: http://www.redhat.com/about/contact/pgpkey.html 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: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0048 Copyright(c) 2000, 2001, 2002 Red Hat, Inc. [***** End Red Hat Security Advisory RHSA-2002:018-10 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Red Hat, Inc. for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Center, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). 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The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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