Denial of service in Microsoft .NET Framework



| Updated: 2017-03-16
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2009-1536
CWE-ID CWE-20
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
 Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Microsoft .NET Framework
Server applications / Frameworks for developing and running applications

Vendor Microsoft

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Denial of service

EUVDB-ID: #VU2747

Risk: High

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2009-1536

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS conditions on the target system.

The weakness exists due to incorrect managing of request scheduling by ASP.NET. By sending multiple HTTP requests, a remote attacker can trigger the Web server to crash.

Successful exploitation of the vulnerability results in denial of service on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation

Install update from vendor's website:

Windows Vista:
Microsoft .NET Framework 2.0 Service Pack 1 and Microsoft .NET Framework 3.5:
https://www.microsoft.com/downloads/details.aspx?familyid=d42444bb-5030-4b47-87fa-9df3a8c640ff
Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5 Service Pack 1:
https://www.microsoft.com/downloads/details.aspx?familyid=310f3aa6-c264-45a2-b24a-3f178b41830e
Microsoft .NET Framework 2.0 Service Pack 1 and Microsoft .NET Framework 3.5:
https://www.microsoft.com/downloads/details.aspx?familyid=cbf40800-f3b3-43da-ace1-d942d3378ccd
Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5 Service Pack 1:
https://www.microsoft.com/downloads/details.aspx?familyid=87c4a868-b3b5-467d-96a4-633532ab548f
Microsoft .NET Framework 2.0 Service Pack 1 and Microsoft .NET Framework 3.5:
https://www.microsoft.com/downloads/details.aspx?familyid=d42444bb-5030-4b47-87fa-9df3a8c640ff
Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5 Service Pack 1:
https://www.microsoft.com/downloads/details.aspx?familyid=310f3aa6-c264-45a2-b24a-3f178b41830e
Microsoft .NET Framework 2.0 Service Pack 1 and Microsoft .NET Framework 3.5:
https://www.microsoft.com/downloads/details.aspx?familyid=cbf40800-f3b3-43da-ace1-d942d3378ccd
Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5 Service Pack 1:
https://www.microsoft.com/downloads/details.aspx?familyid=87c4a868-b3b5-467d-96a4-633532ab548f

Windows Server 2008:
Microsoft .NET Framework 2.0 Service Pack 1 and Microsoft .NET Framework 3.5:
https://www.microsoft.com/downloads/details.aspx?familyid=cbf40800-f3b3-43da-ace1-d942d3378ccd
Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5 Service Pack 1:
https://www.microsoft.com/downloads/details.aspx?familyid=87c4a868-b3b5-467d-96a4-633532ab548f
Microsoft .NET Framework 2.0 Service Pack 1 and Microsoft .NET Framework 3.5:
https://www.microsoft.com/downloads/details.aspx?familyid=cbf40800-f3b3-43da-ace1-d942d3378ccd
Microsoft .NET Framework 2.0 Service Pack 2 and Microsoft .NET Framework 3.5 Service Pack 1:
https://www.microsoft.com/downloads/details.aspx?familyid=87c4a868-b3b5-467d-96a4-633532ab548f

Vulnerable software versions

Windows: Vista

Windows Server: 2008

Microsoft .NET Framework: 2.0 - 3.5

CPE2.3 External links

https://technet.microsoft.com/en-us/library/security/ms09-036.aspx


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.



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