Redhat: 'diskcheck' race condition [UPDATED]
Posted by LinuxSecurity.com Team   
RedHat Linux A race vulnerability exists in the diskcheck package.

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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.Red Hat.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:
ftp://updates.Red Hat.com/powertools/6.2/noarch/diskcheck-3.1.1-12.noarch.rpm

sources:
ftp://updates.Red Hat.com/powertools/6.2/SRPMS/diskcheck-3.1.1-12.src.rpm

Red Hat Powertools 7.0:

noarch:
ftp://updates.Red Hat.com/powertools/7.0/noarch/diskcheck-3.1.1-12.noarch.rpm

sources:
ftp://updates.Red Hat.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.Red Hat.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.