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                   Red Hat, Inc. Security Advisory



Synopsis:          race condition exists in diskcheck

Advisory ID:       RHSA-2000:122-06

Issue date:        2000-12-01

Updated on:        2000-12-08

Product:           Red Hat Powertools

Keywords:          N/A

Cross references:  N/A

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1. Topic:



A race vulnerability exists in the diskcheck package.



2. Relevant releases/architectures:



Red Hat Powertools 6.0 - noarch

Red Hat Powertools 6.1 - noarch

Red Hat Powertools 6.2 - noarch

Red Hat Powertools 7.0 - noarch



3. Problem description:



A race vulnerability exists where a user can replace the tempfile used by

diskcheck with symlinks to other files on the system, making it possible to

corrupt those files.



This update fixes the vulnerability as well as problems with diskcheck

sending mail if /var is on a full partition.



All users should upgrade to the version below.



NOTE: The version of diskcheck shipped in Powertools 7 does not have the

race condition, but should be upgraded to fix the problem with /var

being on a full partition.



4. Solution:



For each RPM for your particular architecture, run:



rpm -Fvh [filename]



where filename is the name of the RPM.



5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):



11724 - tempfile has easily guessed name and follows symlinks

21901 - diskcheck sends empty email if filesystem where tmp file is created fills up





6. RPMs required:



Red Hat Powertools 6.2:



noarch:

http://updates.redhat.com/powertools/6.2/noarch/diskcheck-3.1.1-12.noarch.rpm



sources:

http://updates.redhat.com/powertools/6.2/SRPMS/diskcheck-3.1.1-12.src.rpm



Red Hat Powertools 7.0:



noarch:

http://updates.redhat.com/powertools/7.0/noarch/diskcheck-3.1.1-12.noarch.rpm



sources:

http://updates.redhat.com/powertools/7.0/SRPMS/diskcheck-3.1.1-12.src.rpm



7. Verification:



MD5 sum                           Package Name

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33ec0067e449f3411982f3280d5b51a7  6.2/SRPMS/diskcheck-3.1.1-12.src.rpm

ad5b2b48440b9ce431bd31b9d28bde92  6.2/noarch/diskcheck-3.1.1-12.noarch.rpm

b7670bab7d16b9903735728c65c1a971  7.0/SRPMS/diskcheck-3.1.1-12.src.rpm

e54d258f082219443106341074cecdbf  7.0/noarch/diskcheck-3.1.1-12.noarch.rpm



These packages are GPG signed by Red Hat, Inc. for security.  Our key

is available at:

    http://www.redhat.com/corp/contact.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:



N/A





Copyright(c) 2000 Red Hat, Inc.