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RedHat: samba password buffer overflow vulnerability Print E-mail
User Rating:      How can I rate this item?
Posted by LinuxSecurity.com Team   
RedHat Linux There was a bug in the length checking for encrypted password change requests from clients.

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

Synopsis:          New samba packages available to fix potential security vulnerability
Advisory ID:       RHSA-2002:266-05
Issue date:        2002-11-22
Updated on:        2002-11-21
Product:           Red Hat Linux
Keywords:          samba security encrypted password change
Cross references:  
Obsoletes:         
---------------------------------------------------------------------

1. Topic:

New samba packages are available that fix a security vulnerability present
in samba versions 2.2.2 through 2.2.6. A potential attacker could gain
root access on the target machine. It is strongly encouraged that all Samba
users update to the fixed packages.

As of this time, there are no known exploits for this vulnerability.

2. Relevant releases/architectures:

Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386

3. Problem description:

There was a bug in the length checking for encrypted password change
requests from clients. A client could potentially send an encrypted
password, which, when decrypted with the old hashed password, could be
used as a buffer overrun attack on smbd's stack. The attack would
have to be crafted such that converting a DOS codepage string to little
endian UCS2 unicode would translate into an executable block of code.

Thanks to the Debian Samba maintainers for discovering this issue, and to
the Samba team for providing the fix (and the problem description text above.)

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. RPMs required:

Red Hat Linux 7.3:

SRPMS: 
ftp://updates.Red Hat.com/7.3/en/os/SRPMS/samba-2.2.7-1.7.3.src.rpm

i386: 
ftp://updates.Red Hat.com/7.3/en/os/i386/samba-2.2.7-1.7.3.i386.rpm 
ftp://updates.Red Hat.com/7.3/en/os/i386/samba-common-2.2.7-1.7.3.i386.rpm 
ftp://updates.Red Hat.com/7.3/en/os/i386/samba-client-2.2.7-1.7.3.i386.rpm 
ftp://updates.Red Hat.com/7.3/en/os/i386/samba-swat-2.2.7-1.7.3.i386.rpm

Red Hat Linux 8.0:

SRPMS: 
ftp://updates.Red Hat.com/8.0/en/os/SRPMS/samba-2.2.7-2.src.rpm

i386: 
ftp://updates.Red Hat.com/8.0/en/os/i386/samba-2.2.7-2.i386.rpm 
ftp://updates.Red Hat.com/8.0/en/os/i386/samba-common-2.2.7-2.i386.rpm 
ftp://updates.Red Hat.com/8.0/en/os/i386/samba-client-2.2.7-2.i386.rpm 
ftp://updates.Red Hat.com/8.0/en/os/i386/samba-swat-2.2.7-2.i386.rpm



6. Verification:

MD5 sum                          Package Name
--------------------------------------------------------------------------
5c8ba729bb3e6d2f0614fd543053e6e9 7.3/en/os/SRPMS/samba-2.2.7-1.7.3.src.rpm
92178f0aa6c7ec0cb2b55c0f32c59ca4 7.3/en/os/i386/samba-2.2.7-1.7.3.i386.rpm
6915d467d9572737dfbfcac916734084 7.3/en/os/i386/samba-client-2.2.7-1.7.3.i386.rpm
56ce43d49614bf5a79b90dfbd4a77235 7.3/en/os/i386/samba-common-2.2.7-1.7.3.i386.rpm
82cbcb8e2c3be661e0e6c1c7f9856ecd 7.3/en/os/i386/samba-swat-2.2.7-1.7.3.i386.rpm
9b5ded05dc9cc2c49c40b686ec78caf7 8.0/en/os/SRPMS/samba-2.2.7-2.src.rpm
4e2339d23bad01690938748d84dac186 8.0/en/os/i386/samba-2.2.7-2.i386.rpm
a7a48f9d6d8e45966172ae1b941e0208 8.0/en/os/i386/samba-client-2.2.7-2.i386.rpm
3bd309562e0cdefc8d4cd5b02ee0b71c 8.0/en/os/i386/samba-common-2.2.7-2.i386.rpm
0efdfc0d8de8294c0dd4978a82d15991 8.0/en/os/i386/samba-swat-2.2.7-2.i386.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 -v 

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    
    md5sum 

7. Contact:

The Red Hat security contact is <security@Red Hat.com>.  More contact
details at  http://www.Red Hat.com/solutions/security/news/contact.html

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



 
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