Secunia Research: Samba "reply_netbios_packet()" Buffer Overflow Vulnerability
======================================================================
Secunia Research 15/11/2007
- Samba "reply_netbios_packet()" Buffer Overflow Vulnerability -
======================================================================
Table of Contents
Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10
======================================================================
1) Affected Software
* Samba 3.0.26a
NOTE: Other versions may also be affected.
======================================================================
2) Severity
Rating: Moderately critical
Impact: System access
Where: Local network
======================================================================
3) Vendor's Description of Software
"Samba is an Open Source/Free Software suite that has, since 1992,
provided file and print services to all manner of SMB/CIFS clients,
including the numerous versions of Microsoft Windows operating systems.
Samba is freely available under the GNU General Public License."
Product Link:
http://www.samba.org/
======================================================================
4) Description of Vulnerability
Secunia Research has discovered a vulnerability in Samba, which can be
exploited by malicious people to compromise a vulnerable system.
The vulnerability is caused due to a boundary error within the
"reply_netbios_packet()" function in nmbd/nmbd_packets.c when sending
NetBIOS replies. This can be exploited to cause a stack-based buffer
overflow by sending multiple specially crafted WINS "Name Registration"
requests followed by a WINS "Name Query" request.
Successful exploitation allows execution of arbitrary code, but
requires that Samba is configured to run as a WINS server (the "wins
support" option is enabled).
======================================================================
5) Solution
Apply patch or update to version 3.0.27.
======================================================================
6) Time Table
30/10/2007 - Vendor notified.
30/10/2007 - vendor-sec notified.
30/10/2007 - Vendor response.
15/11/2007 - Public disclosure.
======================================================================
7) Credits
Discovered by Alin Rad Pop, Secunia Research.
======================================================================
8) References
Samba:
http://us1.samba.org/samba/security/CVE-2007-4572.html
The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2007-5398 for the vulnerability.
======================================================================
9) About Secunia
Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:
http://corporate.secunia.com/
Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private
individuals, who are interested in or concerned about IT-security.
http://secunia.com/
Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the
security and reliability of software in general:
http://corporate.secunia.com/secunia_research/33/
Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:
http://secunia.com/secunia_vacancies/
Secunia offers a FREE mailing list called Secunia Security Advisories:
http://secunia.com/secunia_security_advisories/
======================================================================
10) Verification
Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-90/
Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/
======================================================================