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RedHat: 'openssh' Unauthorized access vulnerability Print E-mail
User Rating:      How can I rate this item?
Posted by LinuxSecurity.com Team   
RedHat Linux Updated openssh packages are now available for Red Hat Linux 7, 7.1, and7.2 which close a remotely-exploitable vulnerability in sshd.

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

Synopsis:          Updated openssh packages available
Advisory ID:       RHSA-2002:043-10
Issue date:        2002-03-05
Updated on:        2002-03-08
Product:           Red Hat Linux
Keywords:          openssh sshd channel
Cross references:  
Obsoletes:         RHSA-2001:161
---------------------------------------------------------------------

1. Topic:

Updated openssh packages are now available for Red Hat Linux 7, 7.1, and
7.2 which close a remotely-exploitable vulnerability in sshd.

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, ia64

3. Problem description:

Joost Pol has discovered an off-by-one error in all versions of the OpenSSH
daemon (sshd) prior to version 3.1.

This issue could allow an authenticated user to cause sshd to corrupt its
heap, potentially allowing arbitrary code to be executed on the remote
server.  Alternatively, a malicious SSH server could be crafted to attack a
vulnerable OpenSSH client.  

Users are advised to upgrade to these errata packages containing OpenSSH
3.1, which is not vulnerable to this issue.

The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2002-0083 to this issue.

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.Red Hat.com/bugzilla for more info):

60829 - HIGH: Existing users will gain root privileges.

6. RPMs required:

Red Hat Linux 7.0:

SRPMS: 
ftp://updates.Red Hat.com/7.0/en/os/SRPMS/openssh-3.1p1-1.src.rpm

alpha: 
ftp://updates.Red Hat.com/7.0/en/os/alpha/openssh-3.1p1-1.alpha.rpm 
ftp://updates.Red Hat.com/7.0/en/os/alpha/openssh-clients-3.1p1-1.alpha.rpm 
ftp://updates.Red Hat.com/7.0/en/os/alpha/openssh-server-3.1p1-1.alpha.rpm 
ftp://updates.Red Hat.com/7.0/en/os/alpha/openssh-askpass-3.1p1-1.alpha.rpm 
ftp://updates.Red Hat.com/7.0/en/os/alpha/openssh-askpass-gnome-3.1p1-1.alpha.rpm

i386: 
ftp://updates.Red Hat.com/7.0/en/os/i386/openssh-3.1p1-1.i386.rpm 
ftp://updates.Red Hat.com/7.0/en/os/i386/openssh-clients-3.1p1-1.i386.rpm 
ftp://updates.Red Hat.com/7.0/en/os/i386/openssh-server-3.1p1-1.i386.rpm 
ftp://updates.Red Hat.com/7.0/en/os/i386/openssh-askpass-3.1p1-1.i386.rpm 
ftp://updates.Red Hat.com/7.0/en/os/i386/openssh-askpass-gnome-3.1p1-1.i386.rpm

Red Hat Linux 7.1:

SRPMS: 
ftp://updates.Red Hat.com/7.1/en/os/SRPMS/openssh-3.1p1-1.src.rpm

alpha: 
ftp://updates.Red Hat.com/7.1/en/os/alpha/openssh-3.1p1-1.alpha.rpm 
ftp://updates.Red Hat.com/7.1/en/os/alpha/openssh-clients-3.1p1-1.alpha.rpm 
ftp://updates.Red Hat.com/7.1/en/os/alpha/openssh-server-3.1p1-1.alpha.rpm 
ftp://updates.Red Hat.com/7.1/en/os/alpha/openssh-askpass-3.1p1-1.alpha.rpm 
ftp://updates.Red Hat.com/7.1/en/os/alpha/openssh-askpass-gnome-3.1p1-1.alpha.rpm

i386: 
ftp://updates.Red Hat.com/7.1/en/os/i386/openssh-3.1p1-1.i386.rpm 
ftp://updates.Red Hat.com/7.1/en/os/i386/openssh-clients-3.1p1-1.i386.rpm 
ftp://updates.Red Hat.com/7.1/en/os/i386/openssh-server-3.1p1-1.i386.rpm 
ftp://updates.Red Hat.com/7.1/en/os/i386/openssh-askpass-3.1p1-1.i386.rpm 
ftp://updates.Red Hat.com/7.1/en/os/i386/openssh-askpass-gnome-3.1p1-1.i386.rpm

ia64: 
ftp://updates.Red Hat.com/7.1/en/os/ia64/openssh-3.1p1-1.ia64.rpm 
ftp://updates.Red Hat.com/7.1/en/os/ia64/openssh-clients-3.1p1-1.ia64.rpm 
ftp://updates.Red Hat.com/7.1/en/os/ia64/openssh-server-3.1p1-1.ia64.rpm 
ftp://updates.Red Hat.com/7.1/en/os/ia64/openssh-askpass-3.1p1-1.ia64.rpm 
ftp://updates.Red Hat.com/7.1/en/os/ia64/openssh-askpass-gnome-3.1p1-1.ia64.rpm

Red Hat Linux 7.2:

SRPMS: 
ftp://updates.Red Hat.com/7.2/en/os/SRPMS/openssh-3.1p1-2.src.rpm

i386: 
ftp://updates.Red Hat.com/7.2/en/os/i386/openssh-3.1p1-2.i386.rpm 
ftp://updates.Red Hat.com/7.2/en/os/i386/openssh-clients-3.1p1-2.i386.rpm 
ftp://updates.Red Hat.com/7.2/en/os/i386/openssh-server-3.1p1-2.i386.rpm 
ftp://updates.Red Hat.com/7.2/en/os/i386/openssh-askpass-3.1p1-2.i386.rpm 
ftp://updates.Red Hat.com/7.2/en/os/i386/openssh-askpass-gnome-3.1p1-2.i386.rpm

ia64: 
ftp://updates.Red Hat.com/7.2/en/os/ia64/openssh-3.1p1-2.ia64.rpm 
ftp://updates.Red Hat.com/7.2/en/os/ia64/openssh-clients-3.1p1-2.ia64.rpm 
ftp://updates.Red Hat.com/7.2/en/os/ia64/openssh-server-3.1p1-2.ia64.rpm 
ftp://updates.Red Hat.com/7.2/en/os/ia64/openssh-askpass-3.1p1-2.ia64.rpm 
ftp://updates.Red Hat.com/7.2/en/os/ia64/openssh-askpass-gnome-3.1p1-2.ia64.rpm



7. Verification:

MD5 sum                          Package Name
--------------------------------------------------------------------------
26d50a9b0c36fb1dc58247fbf0e413af 7.0/en/os/SRPMS/openssh-3.1p1-1.src.rpm
54de9c01ad5fe21e228d0b4d48581e62 7.0/en/os/alpha/openssh-3.1p1-1.alpha.rpm
9ceeff94d7f2bc34dbbaf8c36012eb3a 7.0/en/os/alpha/openssh-askpass-3.1p1-1.alpha.rpm
1d9ec549531b3c53221d522ab305af42 7.0/en/os/alpha/openssh-askpass-gnome-3.1p1-1.alpha.rpm
b1ea5c7c6b0de2887b09848138c21e9b 7.0/en/os/alpha/openssh-clients-3.1p1-1.alpha.rpm
41b8b1cbf4842b1f2075155fa8f65b72 7.0/en/os/alpha/openssh-server-3.1p1-1.alpha.rpm
e250bc4f15b417d23cee868030e576a3 7.0/en/os/i386/openssh-3.1p1-1.i386.rpm
84076eb5a5b79c42314c2b904ad1b3a7 7.0/en/os/i386/openssh-askpass-3.1p1-1.i386.rpm
57428dc06c9dfa3447038c59cc179ff2 7.0/en/os/i386/openssh-askpass-gnome-3.1p1-1.i386.rpm
497cfa67d62ebd7b8b97dddf0267309c 7.0/en/os/i386/openssh-clients-3.1p1-1.i386.rpm
9aef89c9b5e5ca5b463789d8ff245d7f 7.0/en/os/i386/openssh-server-3.1p1-1.i386.rpm
26d50a9b0c36fb1dc58247fbf0e413af 7.1/en/os/SRPMS/openssh-3.1p1-1.src.rpm
54de9c01ad5fe21e228d0b4d48581e62 7.1/en/os/alpha/openssh-3.1p1-1.alpha.rpm
9ceeff94d7f2bc34dbbaf8c36012eb3a 7.1/en/os/alpha/openssh-askpass-3.1p1-1.alpha.rpm
1d9ec549531b3c53221d522ab305af42 7.1/en/os/alpha/openssh-askpass-gnome-3.1p1-1.alpha.rpm
b1ea5c7c6b0de2887b09848138c21e9b 7.1/en/os/alpha/openssh-clients-3.1p1-1.alpha.rpm
41b8b1cbf4842b1f2075155fa8f65b72 7.1/en/os/alpha/openssh-server-3.1p1-1.alpha.rpm
e250bc4f15b417d23cee868030e576a3 7.1/en/os/i386/openssh-3.1p1-1.i386.rpm
84076eb5a5b79c42314c2b904ad1b3a7 7.1/en/os/i386/openssh-askpass-3.1p1-1.i386.rpm
57428dc06c9dfa3447038c59cc179ff2 7.1/en/os/i386/openssh-askpass-gnome-3.1p1-1.i386.rpm
497cfa67d62ebd7b8b97dddf0267309c 7.1/en/os/i386/openssh-clients-3.1p1-1.i386.rpm
9aef89c9b5e5ca5b463789d8ff245d7f 7.1/en/os/i386/openssh-server-3.1p1-1.i386.rpm
f0d343b01c91bb5b99a1c84992e0fdca 7.1/en/os/ia64/openssh-3.1p1-1.ia64.rpm
1de814f44f07bef9a95d1802c507c79f 7.1/en/os/ia64/openssh-askpass-3.1p1-1.ia64.rpm
b01087dc75468ad5a79492bcd83a269e 7.1/en/os/ia64/openssh-askpass-gnome-3.1p1-1.ia64.rpm
25a34e33830ada8c24b71934cdb246ef 7.1/en/os/ia64/openssh-clients-3.1p1-1.ia64.rpm
3c2ef228fc7e4d8a1b94a5600ace8912 7.1/en/os/ia64/openssh-server-3.1p1-1.ia64.rpm
f90c4686944897e87b15be09626ff4dc 7.2/en/os/SRPMS/openssh-3.1p1-2.src.rpm
f8c46c51f3bd74a8437a7fb1f0b15502 7.2/en/os/i386/openssh-3.1p1-2.i386.rpm
ef80fbb8b75ed3ff627c2fe060fc5165 7.2/en/os/i386/openssh-askpass-3.1p1-2.i386.rpm
7b2a01eff4dcf0601ff4b54becb949d6 7.2/en/os/i386/openssh-askpass-gnome-3.1p1-2.i386.rpm
1d2528e9f4af919f730423b7bb7a815d 7.2/en/os/i386/openssh-clients-3.1p1-2.i386.rpm
7b65f56a9044dad10f02f444774a9b32 7.2/en/os/i386/openssh-server-3.1p1-2.i386.rpm
343c66f5608e3fd48d5c3b12b66096fa 7.2/en/os/ia64/openssh-3.1p1-2.ia64.rpm
04c1c42e644d9470c41138ffed684628 7.2/en/os/ia64/openssh-askpass-3.1p1-2.ia64.rpm
72aef4e9c4f0213ca371d205830cb05e 7.2/en/os/ia64/openssh-askpass-gnome-3.1p1-2.ia64.rpm
c07001458b48ba0dbb2e960db9b93eb9 7.2/en/os/ia64/openssh-clients-3.1p1-2.ia64.rpm
700054c98ffbec257d4c1b12b02a9867 7.2/en/os/ia64/openssh-server-3.1p1-2.ia64.rpm
 

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
     http://www.Red Hat.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://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0083 
http://marc.theaimsgroup.com/?l=openssh-unix-dev&m=101550282514683


Copyright(c) 2000, 2001, 2002 Red Hat, Inc.

 
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