====================================================================== 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/ ======================================================================