Mandrake: 'openssh' access control bypass vulnerability
Posted by LinuxSecurity.com Team   
Mandrake In some circumstances, the sshd server may not honor the "from=" option that can be associated with a key in a user's ~/.ssh/authorized_keys2 file if multiple keys are listed. This could allow key-based logins from hosts which should not be allowed access.

________________________________________________________________________

                Mandrake Linux Security Update Advisory
________________________________________________________________________

Package name:           openssh
Date:                   October 16th, 2001
Advisory ID:            MDKSA-2001:081

Affected versions:      7.1, 7.2, 8.0, 8.1, Corporate Server 1.0.1,
                        Single Network Firewall 7.2
________________________________________________________________________

Problem Description:

 In some circumstances, the sshd server may not honor the "from=" option
 that can be associated with a key in a user's ~/.ssh/authorized_keys2
 file if multiple keys are listed.  This could allow key-based logins
 from hosts which should not be allowed access.
________________________________________________________________________

References:

   http://www.securityfocus.com/cgi-bin/archive.pl?id=1&mid=216702&start=2001-09-24&end=2001-09-30
________________________________________________________________________

Please verify the update prior to upgrading to ensure the integrity of
the downloaded package.  You can do this with the command:
  rpm --checksig package.rpm
You can get the GPG public key of the Mandrake Linux Security Team at
   http://www.linux-mandrake.com/en/security/RPM-GPG-KEYS
If you use MandrakeUpdate, the verification of md5 checksum and GPG
signature is performed automatically for you.

Linux-Mandrake 7.1:
84be3c5bcaa282b42330b5d3d5ddcd12  7.1/RPMS/openssh-2.9.9p2-2.4mdk.i586.rpm
d2067fdc1ff38050fb2871bfc4cc3d7f  7.1/RPMS/openssh-askpass-2.9.9p2-2.4mdk.i586.rpm
b9e4fc52184006ee04071af72791594a  7.1/RPMS/openssh-askpass-gnome-2.9.9p2-2.4mdk.i586.rpm
9fef6ade9656130a4d21d4bc3fa598d2  7.1/RPMS/openssh-clients-2.9.9p2-2.4mdk.i586.rpm
106280632e07bce010d4cea8b3b90998  7.1/RPMS/openssh-server-2.9.9p2-2.4mdk.i586.rpm
82be8d70f90ba6efa244054408a24005  7.1/SRPMS/openssh-2.9.9p2-2.4mdk.src.rpm

Linux-Mandrake 7.2:
165cd88625e0cf9875739b9d932ec65d  7.2/RPMS/openssh-2.9.9p2-2.3mdk.i586.rpm
d7bb63483656bbf7988449692098aae3  7.2/RPMS/openssh-askpass-2.9.9p2-2.3mdk.i586.rpm
7822b53e2db0c9aa35b399898e6c9244  7.2/RPMS/openssh-askpass-gnome-2.9.9p2-2.3mdk.i586.rpm
1b816fb409fbf2a68a7c8c3993725ee7  7.2/RPMS/openssh-clients-2.9.9p2-2.3mdk.i586.rpm
f1478ef3ea27feb6645423ca97aee54b  7.2/RPMS/openssh-server-2.9.9p2-2.3mdk.i586.rpm
6912fa08e07f88ba1935f3b1ed672cdf  7.2/SRPMS/openssh-2.9.9p2-2.3mdk.src.rpm

Mandrake Linux 8.0:
6f0371285f41bd7e3d98e23eabca48af  8.0/RPMS/openssh-2.9.9p2-2.2mdk.i586.rpm
1727d402aa43854c7aa01651633ba817  8.0/RPMS/openssh-askpass-2.9.9p2-2.2mdk.i586.rpm
a56bd774c19eb1da99216b31b74461a0  8.0/RPMS/openssh-askpass-gnome-2.9.9p2-2.2mdk.i586.rpm
62f876a9ef06762db6c778d7985be10f  8.0/RPMS/openssh-clients-2.9.9p2-2.2mdk.i586.rpm
5be73ac0a84ce2386cb62d5fdf213d11  8.0/RPMS/openssh-server-2.9.9p2-2.2mdk.i586.rpm
237fbb898f0763fa66ab50da997a5f74  8.0/SRPMS/openssh-2.9.9p2-2.2mdk.src.rpm

Mandrake Linux 8.0 (PPC):
30b82eb66a99f23b9ef9458d9aac7bf6  ppc/8.0/RPMS/openssh-2.9.9p2-2.2mdk.ppc.rpm
51fd76a9dd6f5c266c07c1c2d98c4ff5  ppc/8.0/RPMS/openssh-askpass-2.9.9p2-2.2mdk.ppc.rpm
2118c012e4a1d3f99cb4b75b24dd43ea  ppc/8.0/RPMS/openssh-askpass-gnome-2.9.9p2-2.2mdk.ppc.rpm
1833dfc646b5d79fa6b8949a500b340b  ppc/8.0/RPMS/openssh-clients-2.9.9p2-2.2mdk.ppc.rpm
20fe0eeb93f02b0677c2b8d7913ea1a1  ppc/8.0/RPMS/openssh-server-2.9.9p2-2.2mdk.ppc.rpm
237fbb898f0763fa66ab50da997a5f74  ppc/8.0/SRPMS/openssh-2.9.9p2-2.2mdk.src.rpm

Mandrake Linux 8.1:
fa23d1764b38f658cf1d21e0a9cf3521  8.1/RPMS/openssh-2.9.9p2-2.1mdk.i586.rpm
10e58545128d2960a363a5af1fc8e386  8.1/RPMS/openssh-askpass-2.9.9p2-2.1mdk.i586.rpm
1e85080be65393b2584c3d32af0d4f1f  8.1/RPMS/openssh-askpass-gnome-2.9.9p2-2.1mdk.i586.rpm
790a022406078f33039db0d82f6c2a49  8.1/RPMS/openssh-clients-2.9.9p2-2.1mdk.i586.rpm
7d5d736ab419919ab8fbb5d0b38644d1  8.1/RPMS/openssh-server-2.9.9p2-2.1mdk.i586.rpm
b31d50fd92af60987be31639ca6998b3  8.1/SRPMS/openssh-2.9.9p2-2.1mdk.src.rpm

Corporate Server 1.0.1:
84be3c5bcaa282b42330b5d3d5ddcd12  1.0.1/RPMS/openssh-2.9.9p2-2.4mdk.i586.rpm
d2067fdc1ff38050fb2871bfc4cc3d7f  1.0.1/RPMS/openssh-askpass-2.9.9p2-2.4mdk.i586.rpm
b9e4fc52184006ee04071af72791594a  1.0.1/RPMS/openssh-askpass-gnome-2.9.9p2-2.4mdk.i586.rpm
9fef6ade9656130a4d21d4bc3fa598d2  1.0.1/RPMS/openssh-clients-2.9.9p2-2.4mdk.i586.rpm
106280632e07bce010d4cea8b3b90998  1.0.1/RPMS/openssh-server-2.9.9p2-2.4mdk.i586.rpm
82be8d70f90ba6efa244054408a24005  1.0.1/SRPMS/openssh-2.9.9p2-2.4mdk.src.rpm

Single Network Firewall 7.2:
165cd88625e0cf9875739b9d932ec65d  snf7.2/RPMS/openssh-2.9.9p2-2.3mdk.i586.rpm
d7bb63483656bbf7988449692098aae3  snf7.2/RPMS/openssh-askpass-2.9.9p2-2.3mdk.i586.rpm
7822b53e2db0c9aa35b399898e6c9244  snf7.2/RPMS/openssh-askpass-gnome-2.9.9p2-2.3mdk.i586.rpm
1b816fb409fbf2a68a7c8c3993725ee7  snf7.2/RPMS/openssh-clients-2.9.9p2-2.3mdk.i586.rpm
f1478ef3ea27feb6645423ca97aee54b  snf7.2/RPMS/openssh-server-2.9.9p2-2.3mdk.i586.rpm
6912fa08e07f88ba1935f3b1ed672cdf  snf7.2/SRPMS/openssh-2.9.9p2-2.3mdk.src.rpm
________________________________________________________________________

Bug IDs fixed (see https://qa.mandrakesoft.com for more information):

________________________________________________________________________

To upgrade automatically, use MandrakeUpdate.

If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm".

You can download the updates directly from one of the mirror sites
listed at:

   http://www.linux-mandrake.com/en/ftp.php3.

Updated packages are available in the "updates/[ver]/RPMS/" directory.
For example, if you are looking for an updated RPM package for
Mandrake Linux 8.0, look for it in "updates/8.0/RPMS/".  Updated source
RPMs are available as well, but you generally do not need to download
them.

Please be aware that sometimes it takes the mirrors a few hours to
update.

You can view other security advisories for Mandrake Linux at:

   http://www.linux-mandrake.com/en/security/

If you want to report vulnerabilities, please contact

  security@linux-mandrake.com
________________________________________________________________________

Mandrake Linux has two security-related mailing list services that
anyone can subscribe to:

security-announce@linux-mandrake.com

  Mandrake Linux's security announcements mailing list.  Only
  announcements are sent to this list and it is read-only.

security-discuss@linux-mandrake.com

  Mandrake Linux's security discussion mailing list.  This list is open
  to anyone to discuss Mandrake Linux security specifically and Linux
  security in general.

To subscribe to either list, send a message to
  sympa@linux-mandrake.com
with "subscribe [listname]" in the body of the message.

To remove yourself from either list, send a message to
  sympa@linux-mandrake.com
with "unsubscribe [listname]" in the body of the message.

To get more information on either list, send a message to
  sympa@linux-mandrake.com
with "info [listname]" in the body of the message.

Optionally, you can use the web interface to subscribe to or unsubscribe
from either list:

   http://www.linux-mandrake.com/en/flists.php3#security
________________________________________________________________________

Type Bits/KeyID     Date       User ID
pub  1024D/22458A98 2000-07-10 Linux Mandrake Security Team
  <security@linux-mandrake.com>


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