Microsoft Windows Server 2008/Vista SMB Processor EducatedScholar resource management

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Microsoft Windows Server 2008/Vista (Operating System). It has been rated as critical. This issue affects some unknown processing of the component SMB Processor. The manipulation with an unknown input leads to a resource management vulnerability (EducatedScholar). Using CWE to declare the problem leads to CWE-399. Impacted is confidentiality, integrity, and availability.

The weakness was released 09/08/2009 by Laurent GaffiƩ as MS09-050 as confirmed bulletin (Technet). It is possible to read the advisory at The identification of this vulnerability is CVE-2009-3103 since 09/08/2009. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available.

A public exploit has been developed by laurent gaffie in Python and been published before and not just after the advisory. The exploit is available at It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 40887 (MS09-050: Microsoft Windows SMB2 _Smb2ValidateProviderCallback() Vulnerability (975497) (uncredentialed check)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 90527 (Microsoft Server Message Block (SMBv2) Remote Code Execution Vulnerability (MS09-050) and Shadow Brokers (EDUCATEDSCHOLAR)).

Upgrading eliminates this vulnerability. Applying the patch MS09-050 is able to eliminate this problem. The bugfix is ready for download at The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 2 months after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 11792.

The vulnerability is also documented in the databases at X-Force (53090), Tenable (40887) and Exploit-DB (9594). Entries connected to this vulnerability are available at 50449 and 50445.








  • end of life (old version)

CPE 2.3info

CPE 2.2info



VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
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Name: EducatedScholar
Class: Resource management / EducatedScholar
CWE: CWE-399 / CWE-404
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Author: laurent gaffie
Programming Language: 🔍
Download: 🔍

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Nessus ID: 40887
Nessus Name: MS09-050: Microsoft Windows SMB2 _Smb2ValidateProviderCallback() Vulnerability (975497) (uncredentialed check)
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OpenVAS ID: 100283
OpenVAS Name: Microsoft Windows SMB2 _Smb2ValidateProviderCallback() Remote Code Execution Vulnerability
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Saint ID: exploit_info/windows_smb2
Saint Name: Windows SMB2 buffer overflow

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Qualys Name: 🔍

MetaSploit ID: ms09_050_smb2_negotiate_pidhigh.rb
MetaSploit Name: Microsoft SRV2.SYS SMB Negotiate ProcessID Function Table Dereference
MetaSploit File: 🔍

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Threat Intelligenceinfo

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Recommended: Upgrade
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Patch: MS09-050
Suricata ID: 2012063
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09/07/2009 🔍
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09/21/2009 +12 days 🔍
10/13/2009 +22 days 🔍
03/17/2021 +4173 days 🔍



Advisory: MS09-050
Researcher: Laurent GaffiƩ
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2009-3103 (🔍)

X-Force: 53090 - Microsoft Windows srv2.sys code execution, High Risk
SecurityTracker: 1022848 - Windows Server Message Block NEGOTIATE PROTOCOL REQUEST Processing Flaw Lets Remote Users Execute Arbitrary Code
Vulnerability Center: 23449 - [MS09-050] Microsoft Windows Server 2008 and Windows Vista SMB2 Remote Code Execution Vulnerability, Critical
SecurityFocus: 36299 - Microsoft Windows SMB2 '_Smb2ValidateProviderCallback()' Remote Code Execution Vulnerability
Secunia: 36623 - Microsoft Windows SMBv2 Multiple Vulnerabilities, Moderately Critical
OSVDB: 57799 - Microsoft Windows srv2.sys Kernel Driver SMB2 Malformed NEGOTIATE PROTOCOL REQUEST Remote DoS

scip Labs:
See also: 🔍


Created: 09/21/2009 04:13 PM
Updated: 03/17/2021 01:32 PM
Changes: 09/21/2009 04:13 PM (111), 07/14/2017 10:00 AM (18), 03/17/2021 01:30 PM (3), 03/17/2021 01:32 PM (1)
Complete: 🔍


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