An updated mcstrans package that fixes a security issue and a bug is now available. An algorithmic complexity weakness was found in the way the mcstrans daemon handled ranges of compartments in sensitivity labels. A local user could trigger this flaw causing mctransd to temporarily stop responding to other requests; a partial denial of service. This update has been rated as having low security impact by the Red Hat Security Response Team.

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

Synopsis:          Low: mcstrans security and bug fix update
Advisory ID:       RHSA-2007:0542-05
Advisory URL:      https://access.redhat.com/errata/RHSA-2007:0542.html
Issue date:        2007-11-07
Updated on:        2007-11-07
Product:           Red Hat Enterprise Linux
CVE Names:         CVE-2007-4570 
- ---------------------------------------------------------------------1. Summary:

An updated mcstrans package that fixes a security issue and a bug is now
available.

This update has been rated as having low security impact by the Red Hat
Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

3. Problem description:

mcstrans is the translation daemon used on SELinux machines to translate
program context into human readable form.

An algorithmic complexity weakness was found in the way the mcstrans daemon
handled ranges of compartments in sensitivity labels. A local user could
trigger this flaw causing mctransd to temporarily stop responding to other
requests; a partial denial of service.  (CVE-2007-4570)

This update also fixes a problem where the mcstrans daemon was preventing
SSH connections into an SELinux box, that was running a Multi-Level
Security (MLS) Policy with multiple categories.

Users of mcstrans are advised to upgrade to this updated package, which
resolves this issue.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.  

This update is available via Red Hat Network.  Details on how to use 
the Red Hat Network to apply this update are available at

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

228398 - LSPP: Not able to ssh into the machine with multiple categories
288201 - CVE-2007-4570 mctransd DoS

6. RPMs required:

Red Hat Enterprise Linux Desktop (v. 5 client):

SRPMS:
11f10d2f7a344eee82eec893731a4d22  mcstrans-0.2.6-1.el5.src.rpm

i386:
ade7ed8667b6aa159fa3218c2f842236  mcstrans-0.2.6-1.el5.i386.rpm
6426d76117954de72d832f3912b2e31c  mcstrans-debuginfo-0.2.6-1.el5.i386.rpm

x86_64:
0db9bf6e576084bb343f826b4f0e6c7b  mcstrans-0.2.6-1.el5.x86_64.rpm
23fa93a3b07b1aff4a8348e273168667  mcstrans-debuginfo-0.2.6-1.el5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

SRPMS:
11f10d2f7a344eee82eec893731a4d22  mcstrans-0.2.6-1.el5.src.rpm

i386:
ade7ed8667b6aa159fa3218c2f842236  mcstrans-0.2.6-1.el5.i386.rpm
6426d76117954de72d832f3912b2e31c  mcstrans-debuginfo-0.2.6-1.el5.i386.rpm

ia64:
b798e7bb0c57b63d8537bb49292211d5  mcstrans-0.2.6-1.el5.ia64.rpm
90a599aba629dd033e331d76b5805783  mcstrans-debuginfo-0.2.6-1.el5.ia64.rpm

ppc:
a0b839b70b33e73d86f7d3d05811fdf5  mcstrans-0.2.6-1.el5.ppc.rpm
79ace618de83151996e3bd3b8cf0ccce  mcstrans-debuginfo-0.2.6-1.el5.ppc.rpm

s390x:
fdc405c2b94baa8de61eedabbe93019b  mcstrans-0.2.6-1.el5.s390x.rpm
39eb14688a9d5d4bc06abd64992a3042  mcstrans-debuginfo-0.2.6-1.el5.s390x.rpm

x86_64:
0db9bf6e576084bb343f826b4f0e6c7b  mcstrans-0.2.6-1.el5.x86_64.rpm
23fa93a3b07b1aff4a8348e273168667  mcstrans-debuginfo-0.2.6-1.el5.x86_64.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://access.redhat.com/security/team/key/#package

7. References:

https://www.cve.org/CVERecord?id=CVE-2007-4570
https://access.redhat.com/security/updates/classification#low

8. Contact:

The Red Hat security contact is .  More contact
details at https://access.redhat.com/security/team/contact

Copyright 2007 Red Hat, Inc.