Vulnerability identifier: #VU3036

Vulnerability risk: High

CVSSv3.1: 8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:F/RL:O/RC:C]

CVE-ID: CVE-2011-1968

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

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

The weakness exists due to an error in the Remote Desktop Protocol when processing a sequence of malicious packets. A remote attacker can send a specially crafted RDP packets, gain access to an object that was not properly initialized or is deleted and cause the system to stop responding and restart.

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 XP Service Pack 3:
https://www.microsoft.com/downloads/details.aspx?familyid=C07E1630-43BA-491E-BD59-9EB53105986C
Windows XP Professional x64 Edition Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?familyid=797A01DC-39FB-4511-832A-42D2975133F5
Windows Server 2003 Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?familyid=694BA1A6-7512-497D-A572-646A6E07B13B
Windows Server 2003 x64 Edition Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?familyid=308DA543-D49D-4591-8BBC-D65C524BB0AD
Windows Server 2003 with SP2 for Itanium-based Systems:
https://www.microsoft.com/downloads/details.aspx?familyid=3B459BF0-7844-4740-895C-D149D56E781F

Vulnerable software versions

Windows: XP

Windows Server: 2003

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External links
http://technet.microsoft.com/en-us/library/security/ms11-065

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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.