Microsoft Windows SMB Transaction Parser input validation

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

A vulnerability, which was classified as critical, has been found in Microsoft Windows (Operating System) (unknown version). This issue affects an unknown code block of the component SMB Transaction Parser. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The SMB Server service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly validate fields in SMB requests, which allows remote attackers to execute arbitrary code via a malformed request in a (1) SMBv1 or (2) SMBv2 packet, aka "SMB Transaction Parsing Vulnerability."

The weakness was released 04/12/2011 with Microsoft as MS11-020 as confirmed bulletin (Technet). It is possible to read the advisory at microsoft.com. The identification of this vulnerability is CVE-2011-0661 since 01/28/2011. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 53377 (MS11-020: Vulnerability in SMB Server Could Allow Remote Code Execution (2508429)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l.

Upgrading eliminates this vulnerability. Applying the patch MS11-020 is able to eliminate this problem. The bugfix is ready for download at microsoft.com. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 11057.

The vulnerability is also documented in the databases at X-Force (66440), Tenable (53377), SecurityFocus (BID 47198†), OSVDB (71781†) and Secunia (SA44072†). Entries connected to this vulnerability are available at VDB-4335 and VDB-4333.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

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

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 53377
Nessus Name: MS11-020: Vulnerability in SMB Server Could Allow Remote Code Execution (2508429)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 900280
OpenVAS Name: Microsoft Windows SMB Server Remote Code Execution Vulnerability (2508429)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: MS11-020
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

01/28/2011 🔍
04/12/2011 +74 days 🔍
04/12/2011 +0 days 🔍
04/12/2011 +0 days 🔍
04/12/2011 +0 days 🔍
04/12/2011 +0 days 🔍
04/13/2011 +0 days 🔍
04/13/2011 +0 days 🔍
04/13/2011 +0 days 🔍
04/18/2011 +5 days 🔍
03/19/2021 +3623 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS11-020
Organization: Microsoft
Status: Confirmed

CVE: CVE-2011-0661 (🔍)
OVAL: 🔍
IAVM: 🔍

X-Force: 66440
SecurityFocus: 47198 - Microsoft Windows SMB Transaction Parsing Remote Code Execution Vulnerability
Secunia: 44072 - Microsoft Windows SMB Transaction Parsing Vulnerability, Moderately Critical
OSVDB: 71781 - Microsoft Windows SMB Transaction Parsing Unspecified Remote Code Execution
Vulnerability Center: 31030 - [MS11-020] Microsoft Windows SMB Protocol Software Remote Arbitrary Code Execution Vulnerability, Critical

See also: 🔍

Entryinfo

Created: 04/18/2011 02:00 AM
Updated: 03/19/2021 08:50 AM
Changes: 04/18/2011 02:00 AM (87), 03/21/2017 10:05 AM (11), 03/19/2021 08:50 AM (3)
Complete: 🔍
Cache ID: 18:4E2:40

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