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TUCoPS :: Linux :: Red Hat/Fedora :: ciacm010.txt

CIAC M-010 Red Hat OpenSSH Vulnerability





[CIAC] INFORMATION BULLETIN

M-010: Red Hat OpenSSH Vulnerability

[Red Hat Advisory RHSA-2001:114-05]

October 24, 2001 00:00 GMT
  ------------------------------------------------------------------------
 PROBLEM:           If a user lists multiple keys in their
                    ".ssh/authorized_keys2" file, sshd may in some
                    circumstances not honor the "from" option which can be
                    associated with a key, thus allowing unauthorized
                    users to log in from hosts that have been denied
                    access.
 PLATFORM:             * Red Hat Linux 7.0 - alpha, i386
                       * Red Hat Linux 7.1 - alpha, i386, ia64
                       * Red Hat Linux 7.2 - i386
 DAMAGE:            The vulnerability may allow unauthorized users to log
                    in from hosts that have been denied access.
 SOLUTION:          Before applying this update, make sure all previously
                    released errata relevant to your system have been
                    applied. Proceed to install updated openssh packages
                    as prescribed below.
  ------------------------------------------------------------------------
 VULNERABILITY      The risk is LOW. An attacker must have access to an
 ASSESSMENT:        authorized account (username and password) on the
                    machine being attacked.
  ------------------------------------------------------------------------

 LINKS:
   CIAC BULLETIN:          http://www.ciac.org/ciac/bulletins/m-010.shtml
  ------------------------------------------------------------------------

[***** Start Red Hat Advisory RHSA-2001:114-05 *****]

---------------------------------------------------------------------
                    Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Updated openssh packages available
Advisory ID:       RHSA-2001:114-05
Issue date:        2001-09-27
Updated on:        2001-10-19
Product:           Red Hat Linux
Keywords:          openssh source IP
Cross references:
Obsoletes:
---------------------------------------------------------------------

1. Topic:

Updated openssh packages are now available for Red Hat Linux 7 and 7.1.
These packages fix a vulnerability which may allow unauthorized users to
log in from hosts that have been denied access.

2001-10-22: Pacakges are now available for Red Hat Linux 7.2.

2. Relevant releases/architectures:

Red Hat Linux 7.0 - alpha, i386

Red Hat Linux 7.1 - alpha, i386, ia64

Red Hat Linux 7.2 - i386

3. Problem description:

If a user lists multiple keys in her .ssh/authorized_keys2 file, sshd may
in some circumstances not honor the "from" option which can be associated
with a key, thereby allowing key-based logins from hosts which should not
be allowed access.

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):

6. RPMs required:

Red Hat Linux 7.0:

SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/openssh-2.9p2-8.7.src.rpm

alpha:
ftp://updates.redhat.com/7.0/en/os/alpha/openssh-2.9p2-8.7.alpha.rpm
ftp://updates.redhat.com/7.0/en/os/alpha/openssh-clients-2.9p2-8.7.alpha.rpm
ftp://updates.redhat.com/7.0/en/os/alpha/openssh-server-2.9p2-8.7.alpha.rpm
ftp://updates.redhat.com/7.0/en/os/alpha/openssh-askpass-2.9p2-8.7.alpha.rpm
ftp://updates.redhat.com/7.0/en/os/alpha/openssh-askpass-gnome-2.9p2-8.7.alpha.rpm

i386:
ftp://updates.redhat.com/7.0/en/os/i386/openssh-2.9p2-8.7.i386.rpm
ftp://updates.redhat.com/7.0/en/os/i386/openssh-clients-2.9p2-8.7.i386.rpm
ftp://updates.redhat.com/7.0/en/os/i386/openssh-server-2.9p2-8.7.i386.rpm
ftp://updates.redhat.com/7.0/en/os/i386/openssh-askpass-2.9p2-8.7.i386.rpm
ftp://updates.redhat.com/7.0/en/os/i386/openssh-askpass-gnome-2.9p2-8.7.i386.rpm

Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/openssh-2.9p2-8.7.src.rpm

alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/openssh-2.9p2-8.7.alpha.rpm
ftp://updates.redhat.com/7.1/en/os/alpha/openssh-clients-2.9p2-8.7.alpha.rpm
ftp://updates.redhat.com/7.1/en/os/alpha/openssh-server-2.9p2-8.7.alpha.rpm
ftp://updates.redhat.com/7.1/en/os/alpha/openssh-askpass-2.9p2-8.7.alpha.rpm
ftp://updates.redhat.com/7.1/en/os/alpha/openssh-askpass-gnome-2.9p2-8.7.alpha.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/openssh-2.9p2-8.7.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/openssh-clients-2.9p2-8.7.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/openssh-server-2.9p2-8.7.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/openssh-askpass-2.9p2-8.7.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/openssh-askpass-gnome-2.9p2-8.7.i386.rpm

ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/openssh-2.9p2-8.7.ia64.rpm
ftp://updates.redhat.com/7.1/en/os/ia64/openssh-clients-2.9p2-8.7.ia64.rpm
ftp://updates.redhat.com/7.1/en/os/ia64/openssh-server-2.9p2-8.7.ia64.rpm
ftp://updates.redhat.com/7.1/en/os/ia64/openssh-askpass-2.9p2-8.7.ia64.rpm
ftp://updates.redhat.com/7.1/en/os/ia64/openssh-askpass-gnome-2.9p2-8.7.ia64.rpm

Red Hat Linux 7.2:

SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/openssh-2.9p2-9.src.rpm

i386:
ftp://updates.redhat.com/7.2/en/os/i386/openssh-2.9p2-9.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/openssh-clients-2.9p2-9.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/openssh-server-2.9p2-9.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/openssh-askpass-2.9p2-9.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/openssh-askpass-gnome-2.9p2-9.i386.rpm

7. Verification:

MD5 sum                           Package Name
--------------------------------------------------------------------------
2cb978dd97527b75dd765cc7866747be 7.0/en/os/SRPMS/openssh-2.9p2-8.7.src.rpm
3f25b21ea52cf287b3f92dde9ebeb6e5 7.0/en/os/alpha/openssh-2.9p2-8.7.alpha.rpm
0aa7e84cf7051625c266fd06097f5421
7.0/en/os/alpha/openssh-askpass-2.9p2-8.7.alpha.rpm
b0bc920fb83c38f91696283ae9a35c70
7.0/en/os/alpha/openssh-askpass-gnome-2.9p2-8.7.alpha.rpm
3ba198d73c0c2b98b1d28b1209529704
7.0/en/os/alpha/openssh-clients-2.9p2-8.7.alpha.rpm
b6190a028673032994ccc21cf2a1d620
7.0/en/os/alpha/openssh-server-2.9p2-8.7.alpha.rpm
968125b43cb68330aa58a85e082573c6 7.0/en/os/i386/openssh-2.9p2-8.7.i386.rpm
913350e14f7e40c1cbaaf01a68ff2af6
7.0/en/os/i386/openssh-askpass-2.9p2-8.7.i386.rpm
62aac745851160f5805eaee52cdb6eb9
7.0/en/os/i386/openssh-askpass-gnome-2.9p2-8.7.i386.rpm
d2831ff8f3032462b511ec9bd8e486f2
7.0/en/os/i386/openssh-clients-2.9p2-8.7.i386.rpm
3a995bf67827eaa272976df85939d778
7.0/en/os/i386/openssh-server-2.9p2-8.7.i386.rpm
2cb978dd97527b75dd765cc7866747be 7.1/en/os/SRPMS/openssh-2.9p2-8.7.src.rpm
917606bec87a2598db083075248d63f3 7.1/en/os/alpha/openssh-2.9p2-8.7.alpha.rpm
59e697845982082983be668c1491f478
7.1/en/os/alpha/openssh-askpass-2.9p2-8.7.alpha.rpm
b1a4c72deb5086d80b0065cd1ddf6ce4
7.1/en/os/alpha/openssh-askpass-gnome-2.9p2-8.7.alpha.rpm
16523f9c4e76c077dc10505fa1c46f2f
7.1/en/os/alpha/openssh-clients-2.9p2-8.7.alpha.rpm
4844484c7174ee970617579a4355639d
7.1/en/os/alpha/openssh-server-2.9p2-8.7.alpha.rpm
968125b43cb68330aa58a85e082573c6 7.1/en/os/i386/openssh-2.9p2-8.7.i386.rpm
913350e14f7e40c1cbaaf01a68ff2af6
7.1/en/os/i386/openssh-askpass-2.9p2-8.7.i386.rpm
62aac745851160f5805eaee52cdb6eb9
7.1/en/os/i386/openssh-askpass-gnome-2.9p2-8.7.i386.rpm
d2831ff8f3032462b511ec9bd8e486f2
7.1/en/os/i386/openssh-clients-2.9p2-8.7.i386.rpm
3a995bf67827eaa272976df85939d778
7.1/en/os/i386/openssh-server-2.9p2-8.7.i386.rpm
d2cfbc8f711499f14e850e3a39216b72 7.1/en/os/ia64/openssh-2.9p2-8.7.ia64.rpm
676181a27221581a0144d5987d42e5d8
7.1/en/os/ia64/openssh-askpass-2.9p2-8.7.ia64.rpm
48455412e34bd704d6c7516f5ed8208c
7.1/en/os/ia64/openssh-askpass-gnome-2.9p2-8.7.ia64.rpm
225d83ddfebb3eba7fe290c33c5c41cf
7.1/en/os/ia64/openssh-clients-2.9p2-8.7.ia64.rpm
b6cfceece2ac8f5060ab63d6f7254770
7.1/en/os/ia64/openssh-server-2.9p2-8.7.ia64.rpm
b8962a6f832e333d8fcf8782228f78e3 7.2/en/os/SRPMS/openssh-2.9p2-9.src.rpm
c553416074a5fc54d309c6e7653f684a 7.2/en/os/i386/openssh-2.9p2-9.i386.rpm
557a7615d1abf68e4b2bb998c0091638
7.2/en/os/i386/openssh-askpass-2.9p2-9.i386.rpm
4b1df978407683e2c160f496f24e26e5
7.2/en/os/i386/openssh-askpass-gnome-2.9p2-9.i386.rpm
f35d0f0b45fd5fd3ceb06589ca18aab3
7.2/en/os/i386/openssh-clients-2.9p2-9.i386.rpm
d9fcc0d6d03c59b04681d6e755e3cb92
7.2/en/os/i386/openssh-server-2.9p2-9.i386.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://www.securityfocus.com/cgi-bin/archive.pl?id=1&mid=216702&start=2001-09-24&end=2001-09-30

Copyright(c) 2000, 2001 Red Hat, Inc.

[***** End Red Hat Advisory RHSA-2001:114-05 *****]

  ------------------------------------------------------------------------
CIAC wishes to acknowledge the contributions of Red Hat Linux for the
information contained in this bulletin.
  ------------------------------------------------------------------------
CIAC services are available to DOE, DOE Contractors, and the NIH. CIAC can
be contacted at:

    Voice:          +1 925-422-8193 (7 x 24)

    FAX:            +1 925-423-8002

    STU-III:        +1 925-423-2604

    E-mail:          ciac@llnl.gov

    World Wide Web:  http://www.ciac.org/

                     http://ciac.llnl.gov

                     (same machine -- either one will work)

    Anonymous FTP:   ftp.ciac.org

                     ciac.llnl.gov

                     (same machine -- either one will work)

  ------------------------------------------------------------------------
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,
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advertising or product endorsement purposes.
  ------------------------------------------------------------------------
UCRL-MI-119788


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