Vulnerability: MS10-041 - Vulnerability in Microsoft .NET Framework Could Allow Tampering (981343)

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	Details
Vulnerability name/brief description	MS10-041 - Vulnerability in Microsoft .NET Framework Could Allow Tampering (981343)
CVE/CAN name	CVE-2009-0217
Vendor threat level	Important
SophosLabs threat level	Medium
Solution	MS10-041
Vendor description	This security update resolves a publicly disclosed vulnerability in Microsoft .NET Framework. The vulnerability could allow data tampering of signed XML content without being detected. In custom applications, the security impact depends on how the signed content is used in the specific application. Scenarios in which signed XML messages are transmitted over a secure channel (such as SSL) are not affected by this vulnerability.
SophosLabs comments	This update resolves a publicly disclosed flaw in the Microsoft .Net framework that could allow an attacker to alter signed XML content. Signed XML transmitted via secure channels ( like those protected by SSL ) are not at risk of being exploited via this vulnerability. The extent at which this jeopardizes the security of an application will depend on how a .Net based application utilizes signed XML. Examples of worst case scenarios would include; where signed XML content would be used to assign user credentials or transmit executable code, though these scenarios are not likely to be common.
SophosLabs testing result	N/A
Currently known exploits	At the time of writing SophosLabs have not observed any malware attempting to exploit this vulnerability. Should this situation change samples will be analyzed and we will take action as necessary.
First sample seen	N/A
Discovery date	8th June 2010
Affected software	Microsoft .NET Framework 1.1 Service Pack 1 Microsoft .NET Framework 1.0 Service Pack 3 Microsoft .NET Framework 2.0 Service Pack 1 Microsoft .NET Framework 2.0 Service Pack 2 Microsoft .NET Framework 3.5 Microsoft .NET Framework 3.5 Service Pack 1 Microsoft .NET Framework 3.5.1
References	http://www.microsoft.com/technet/security/bulletin/MS10-041 http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2009-0217
Credits	Microsoft MAPP
Revisions	8th June 2010 - Initial analysis written

Explanation of terms

Vulnerability Name/Brief Description:
Vendor identifier plus a brief description of the type of attack.

CVE/CAN Name:
Currently assigned CVE name. If a CVE name doesn't exist the CAN name will be used until a CVE has been assigned.

Vendor Threat Level:
Threat level assigned by the vendor

SophosLabs Threat Level:
Threat level assigned by SophosLabs

• LOW RISK - There is little chance of this vulnerability being actively exploited by malware.
• MEDIUM RISK - There is a possibility of this vulnerability being actively exploited by malware.
• HIGH RISK - There is a strong possibility of this vulnerability being actively exploited by malware.
• CRITICAL RISK - This vulnerability will almost certainly be actively exploited by malware.

Solution:
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Vendor Description:
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SophosLabs Comments:
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SophosLabs Testing Result:
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Currently Known Exploits:
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First Sample Seen:
Date of the first sample seen by SophosLabs.

Discovery Date:
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Affected Software:
Vulnerable platforms and software versions.