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Category:   Application (Generic)  >   File Alteration Monitor (FAM) Vendors:   SGI (Silicon Graphics)
(Red Hat Issues Fix) File Alteration Monitor (FAM) Primary Group Handling Flaw May Disclose the Root User's Monitored File Names to Local Users
SecurityTracker Alert ID:  1012773
SecurityTracker URL:  http://securitytracker.com/id/1012773
CVE Reference:   CVE-2002-0875   (Links to External Site)
Date:  Jan 5 2005
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.6.7 and prior versions
Description:   A vulnerability was reported in the File Alteration Monitor (FAM) utility. The system may disclose some filenames belonging to another user to a local user.

A flaw was reported in the primary group handling. In some cases, a local user could learn the names of files in the 'root' user's group of files being monitored.

A demonstration exploit transcript is provided:

% ./test -d /root
FAMMonitorDirectory("/root")
FAMMonitorDirectory("/root")
DIR /root: /root Exists
DIR /root: .gnome Exists
DIR /root: Desktop Exists
...

For the original bug report, see the following URL:

http://oss.sgi.com/bugzilla/long_list.cgi?buglist=151

Impact:   A local user could learn the names of files being monitored by the 'root' level user.
Solution:   Red Hat has released a fix.

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/fam-2.6.4-12.src.rpm
096b61817169f0d2fc0fb1098edff658 fam-2.6.4-12.src.rpm

i386:
a0d8d2cc68ff46a9b09d1261d53a2f0d fam-2.6.4-12.i386.rpm
973679fabde39a480bcb8919c11ea2c7 fam-devel-2.6.4-12.i386.rpm

ia64:
7b0d9e77db18bb278d7c18aaa49ff6d5 fam-2.6.4-12.ia64.rpm
d825882efcca7b9b05bc0145fb420f9d fam-devel-2.6.4-12.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/fam-2.6.4-12.src.rpm
096b61817169f0d2fc0fb1098edff658 fam-2.6.4-12.src.rpm

ia64:
7b0d9e77db18bb278d7c18aaa49ff6d5 fam-2.6.4-12.ia64.rpm
d825882efcca7b9b05bc0145fb420f9d fam-devel-2.6.4-12.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/fam-2.6.4-12.src.rpm
096b61817169f0d2fc0fb1098edff658 fam-2.6.4-12.src.rpm

i386:
a0d8d2cc68ff46a9b09d1261d53a2f0d fam-2.6.4-12.i386.rpm
973679fabde39a480bcb8919c11ea2c7 fam-devel-2.6.4-12.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/fam-2.6.4-12.src.rpm
096b61817169f0d2fc0fb1098edff658 fam-2.6.4-12.src.rpm

i386:
a0d8d2cc68ff46a9b09d1261d53a2f0d fam-2.6.4-12.i386.rpm
973679fabde39a480bcb8919c11ea2c7 fam-devel-2.6.4-12.i386.rpm

Vendor URL:  oss.sgi.com/projects/fam/index.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Fedora)
Underlying OS Comments:  2.1

Message History:   This archive entry is a follow-up to the message listed below.
Aug 17 2002 File Alteration Monitor (FAM) Primary Group Handling Flaw May Disclose the Root User's Monitored File Names to Local Users



 Source Message Contents

Subject:  [RHSA-2005:005-01] Updated fam packages fix security issue


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Updated fam packages fix security issue
Advisory ID:       RHSA-2005:005-01
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2005-005.html
Issue date:        2005-01-05
Updated on:        2005-01-05
Product:           Red Hat Enterprise Linux
CVE Names:         CAN-2002-0875
- ---------------------------------------------------------------------

1. Summary:

Updated fam packages that fix an information disclosure bug are now available.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386

3. Problem description:

FAM, the File Alteration Monitor, provides a daemon and an API which
applications can use for notification of changes in specific files or
directories.

A bug has been found in the way FAM handles group permissions.  It is
possible that a local unprivileged user can use a flaw in FAM's group
handling to discover the names of files which are only viewable to users in
the 'root' group.  The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2002-0875 to this issue.  This
issue only affects the version of FAM shipped with Red Hat Enterprise Linux
2.1.

Users of FAM should update to these updated packages which contain
backported patches and are not vulnerable to this issue.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.  Use Red Hat
Network to download and update your packages.  To launch the Red Hat
Update Agent, use the following command:

    up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

    http://www.redhat.com/docs/manuals/enterprise/

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

137445 - CAN-2002-0875 filename disclosure in FAM

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/fam-2.6.4-12.src.rpm
096b61817169f0d2fc0fb1098edff658  fam-2.6.4-12.src.rpm

i386:
a0d8d2cc68ff46a9b09d1261d53a2f0d  fam-2.6.4-12.i386.rpm
973679fabde39a480bcb8919c11ea2c7  fam-devel-2.6.4-12.i386.rpm

ia64:
7b0d9e77db18bb278d7c18aaa49ff6d5  fam-2.6.4-12.ia64.rpm
d825882efcca7b9b05bc0145fb420f9d  fam-devel-2.6.4-12.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/fam-2.6.4-12.src.rpm
096b61817169f0d2fc0fb1098edff658  fam-2.6.4-12.src.rpm

ia64:
7b0d9e77db18bb278d7c18aaa49ff6d5  fam-2.6.4-12.ia64.rpm
d825882efcca7b9b05bc0145fb420f9d  fam-devel-2.6.4-12.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/fam-2.6.4-12.src.rpm
096b61817169f0d2fc0fb1098edff658  fam-2.6.4-12.src.rpm

i386:
a0d8d2cc68ff46a9b09d1261d53a2f0d  fam-2.6.4-12.i386.rpm
973679fabde39a480bcb8919c11ea2c7  fam-devel-2.6.4-12.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/fam-2.6.4-12.src.rpm
096b61817169f0d2fc0fb1098edff658  fam-2.6.4-12.src.rpm

i386:
a0d8d2cc68ff46a9b09d1261d53a2f0d  fam-2.6.4-12.i386.rpm
973679fabde39a480bcb8919c11ea2c7  fam-devel-2.6.4-12.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0875

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2005 Red Hat, Inc.

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