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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Red Hat Adds Fix for 7.1) Samba Buffer Overflow in call_trans2open() Function Lets Remote Users Execute Arbitrary Code With Root Privileges
SecurityTracker Alert ID:  1006531
SecurityTracker URL:  http://securitytracker.com/id/1006531
CVE Reference:   CAN-2003-0201   (Links to External Site)
Date:  Apr 9 2003
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.2.8a, also 2.0.10 and prior
Description:   A buffer overflow vulnerability was reported in Samba. A remote user can gain root access on the target system.

Digital Defense reported that a remote user can trigger a buffer overflow in the call_trans2open() function in the 'trans2.c' file. The function performs a StrnCpy() operation using a length variable that is 1 byte too long, according to the report. Digital Defense warned that a remote user can exploit this flaw to execute arbitrary code with root privileges.

A scanning utility to assist in identifying hosts running Samba is available at:

http://www.digitaldefense.net/labs/tools/nmbping.pl

A demonstration exploit is available at:

http://www.digitaldefense.net/labs/tools/trans2root.pl
Impact:   A remote user can execute arbitrary code with root privileges to gain root access on the system.
Solution:   Red Hat has added a fix for Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/samba-2.0.10-5.7.1.src.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/samba-2.0.10-5.7.1.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/samba-common-2.0.10-5.7.1.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/samba-swat-2.0.10-5.7.1.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/samba-client-2.0.10-5.7.1.i386.rpm

The verification checksums are:

MD5 sum Package Name

09a8bdd2a71c606cbe9008b09b5cb4a7 7.1/en/os/SRPMS/samba-2.0.10-5.7.1.src.rpm
43876406f5ff4550359d7a5ebf7cb324 7.1/en/os/i386/samba-2.0.10-5.7.1.i386.rpm
24481e57d5525b193376852f031a54e0 7.1/en/os/i386/samba-client-2.0.10-5.7.1.i386.rpm
a7de8a59dcf1b2bacdf6681662431cb2 7.1/en/os/i386/samba-common-2.0.10-5.7.1.i386.rpm
e413837799ff3bc860c868947fabd523 7.1/en/os/i386/samba-swat-2.0.10-5.7.1.i386.rpm

Fixes for 7.2, 7.3, 8.0, and 9 were previously reported [see the Message History] but are included in the Source Message.
Vendor URL:  www.samba.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Red Hat Linux)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 7 2003 Samba Buffer Overflow in call_trans2open() Function Lets Remote Users Execute Arbitrary Code With Root Privileges


 Source Message Contents
Date:  Wed, 9 Apr 2003 04:27 -0400
Subject:  [RHSA-2003:137-02] New samba packages fix security vulnerability


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

Synopsis:          New samba packages fix security vulnerability
Advisory ID:       RHSA-2003:137-02
Issue date:        2003-04-08
Updated on:        2003-04-09
Product:           Red Hat Linux
Keywords:          smb
Cross references:  
Obsoletes:         RHSA-2003:095
CVE Names:         CAN-2003-0196 CAN-2003-0201
---------------------------------------------------------------------

1. Topic:

Updated Samba packages that fix a security vulnerability are now available.

[Updated 9 April 2003]
Fixed Samba packages for Red Hat Linux 7.1 have been added to this erratum.

2. Relevant releases/architectures:

Red Hat Linux 7.1 - i386
Red Hat Linux 7.2 - i386, ia64
Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386
Red Hat Linux 9 - i386

3. Problem description:

Samba is a suite of utilities which provide file and printer sharing
services to SMB/CIFS clients.

A security vulnerability has been found in versions of Samba up to and
including 2.2.8.   An anonymous user could exploit the vulnerability to
gain root access on the target machine.  Note that this is a different
vulnerability than the one fixed by RHSA-2003:095.

An exploit for this vulnerability is publicly available.

All users of Samba are advised to update to the packages listed in this
erratum, which contain a backported patch correcting this vulnerability.

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):

86307 - Netlogon causes DoS since upgrade to latest update
82041 - ignores wide links, serving files which shouldn't be served

6. RPMs required:

Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/samba-2.0.10-5.7.1.src.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/samba-2.0.10-5.7.1.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/samba-common-2.0.10-5.7.1.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/samba-swat-2.0.10-5.7.1.i386.rpm
ftp://updates.redhat.com/7.1/en/os/i386/samba-client-2.0.10-5.7.1.i386.rpm

Red Hat Linux 7.2:

SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/samba-2.2.7-3.7.2.src.rpm

i386:
ftp://updates.redhat.com/7.2/en/os/i386/samba-2.2.7-3.7.2.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/samba-common-2.2.7-3.7.2.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/samba-client-2.2.7-3.7.2.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/samba-swat-2.2.7-3.7.2.i386.rpm

ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/samba-2.2.7-3.7.2.ia64.rpm
ftp://updates.redhat.com/7.2/en/os/ia64/samba-common-2.2.7-3.7.2.ia64.rpm
ftp://updates.redhat.com/7.2/en/os/ia64/samba-client-2.2.7-3.7.2.ia64.rpm
ftp://updates.redhat.com/7.2/en/os/ia64/samba-swat-2.2.7-3.7.2.ia64.rpm

Red Hat Linux 7.3:

SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/samba-2.2.7-3.7.3.src.rpm

i386:
ftp://updates.redhat.com/7.3/en/os/i386/samba-2.2.7-3.7.3.i386.rpm
ftp://updates.redhat.com/7.3/en/os/i386/samba-common-2.2.7-3.7.3.i386.rpm
ftp://updates.redhat.com/7.3/en/os/i386/samba-client-2.2.7-3.7.3.i386.rpm
ftp://updates.redhat.com/7.3/en/os/i386/samba-swat-2.2.7-3.7.3.i386.rpm

Red Hat Linux 8.0:

SRPMS:
ftp://updates.redhat.com/8.0/en/os/SRPMS/samba-2.2.7-5.8.0.src.rpm

i386:
ftp://updates.redhat.com/8.0/en/os/i386/samba-2.2.7-5.8.0.i386.rpm
ftp://updates.redhat.com/8.0/en/os/i386/samba-common-2.2.7-5.8.0.i386.rpm
ftp://updates.redhat.com/8.0/en/os/i386/samba-client-2.2.7-5.8.0.i386.rpm
ftp://updates.redhat.com/8.0/en/os/i386/samba-swat-2.2.7-5.8.0.i386.rpm

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/samba-2.2.7a-8.9.0.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/samba-2.2.7a-8.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/samba-common-2.2.7a-8.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/samba-client-2.2.7a-8.9.0.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/samba-swat-2.2.7a-8.9.0.i386.rpm



7. Verification:

MD5 sum                          Package Name
--------------------------------------------------------------------------
09a8bdd2a71c606cbe9008b09b5cb4a7 7.1/en/os/SRPMS/samba-2.0.10-5.7.1.src.rpm
43876406f5ff4550359d7a5ebf7cb324 7.1/en/os/i386/samba-2.0.10-5.7.1.i386.rpm
24481e57d5525b193376852f031a54e0 7.1/en/os/i386/samba-client-2.0.10-5.7.1.i386.rpm
a7de8a59dcf1b2bacdf6681662431cb2 7.1/en/os/i386/samba-common-2.0.10-5.7.1.i386.rpm
e413837799ff3bc860c868947fabd523 7.1/en/os/i386/samba-swat-2.0.10-5.7.1.i386.rpm
4753f8b50da25cd251354248cc309930 7.2/en/os/SRPMS/samba-2.2.7-3.7.2.src.rpm
9047e4072c65e9f11bbfbb00e45ee257 7.2/en/os/i386/samba-2.2.7-3.7.2.i386.rpm
df7f4ba09d0ead29e1e06b8467b30935 7.2/en/os/i386/samba-client-2.2.7-3.7.2.i386.rpm
d035f89b5155099232eb1d12e3b551ef 7.2/en/os/i386/samba-common-2.2.7-3.7.2.i386.rpm
7c852414dc27505e6cad198d1059580a 7.2/en/os/i386/samba-swat-2.2.7-3.7.2.i386.rpm
208fc22f66c028014ee590fd4b09cd8f 7.2/en/os/ia64/samba-2.2.7-3.7.2.ia64.rpm
f4cc93943361cd213269e1ba40da0b18 7.2/en/os/ia64/samba-client-2.2.7-3.7.2.ia64.rpm
d333b4149ef242d6c4059f45f462219d 7.2/en/os/ia64/samba-common-2.2.7-3.7.2.ia64.rpm
d7116e4dc29f5ca4de4cf97c4bb945bb 7.2/en/os/ia64/samba-swat-2.2.7-3.7.2.ia64.rpm
0fd8526d3a8f5e441bc16098e124b285 7.3/en/os/SRPMS/samba-2.2.7-3.7.3.src.rpm
edbd81c52155a0b7eb107fda054ca945 7.3/en/os/i386/samba-2.2.7-3.7.3.i386.rpm
7c03367ed0576d580a60df18d97c6681 7.3/en/os/i386/samba-client-2.2.7-3.7.3.i386.rpm
689ca3fed3b63d59d680109881c610bb 7.3/en/os/i386/samba-common-2.2.7-3.7.3.i386.rpm
343902163244399713a77161c8cc58f5 7.3/en/os/i386/samba-swat-2.2.7-3.7.3.i386.rpm
2198081f27c842f66377c9b595b4694d 8.0/en/os/SRPMS/samba-2.2.7-5.8.0.src.rpm
2fea298375c9f6307e84dc384c97c63c 8.0/en/os/i386/samba-2.2.7-5.8.0.i386.rpm
559490c7bddce43b98c4a65cfdc03e29 8.0/en/os/i386/samba-client-2.2.7-5.8.0.i386.rpm
0c20656f0202f421bf8ae536d1347a98 8.0/en/os/i386/samba-common-2.2.7-5.8.0.i386.rpm
0c0542bdd2f787b72e440af66927f9f1 8.0/en/os/i386/samba-swat-2.2.7-5.8.0.i386.rpm
9e1763f38f616b76030584eea6e4bbaf 9/en/os/SRPMS/samba-2.2.7a-8.9.0.src.rpm
4fca0fbb65534abf85972deb9bfed4bc 9/en/os/i386/samba-2.2.7a-8.9.0.i386.rpm
9e40436148d54048e22670787a66a92e 9/en/os/i386/samba-client-2.2.7a-8.9.0.i386.rpm
ef0c8e03cd63888283e58e4b9e5a84fb 9/en/os/i386/samba-common-2.2.7a-8.9.0.i386.rpm
23277324eca8438aa7c4ae67ea4f7594 9/en/os/i386/samba-swat-2.2.7a-8.9.0.i386.rpm


These packages are GPG signed by Red Hat for security.  Our key is
available at http://www.redhat.com/solutions/security/news/publickey/

You can verify each package with the following command:
    
    rpm --checksig -v <filename>

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 <filename>


8. References:

http://www.digitaldefense.net/labs/advisories/DDI-1013.txt
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0196
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0201

9. Contact:

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

Copyright 2003 Red Hat, Inc.



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