Vulnerability identifier: #VU2998

Vulnerability risk: High

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2012-0176

CWE-ID: CWE-415

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Silverlight
Client/Desktop applications / Plugins for browsers, ActiveX components

Vendor: Microsoft

Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to double-free error when rendering specially crafted XAML glyphs. A remote attacker can create a Web site containing a malicious XAML browser application, trick the victim into visiting it, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Mitigation
Insatll update from vendor's wenbsite:

Microsoft Silverlight 4 when installed on all supported releases of Microsoft Windows clients:
https://www.microsoft.com/downloads/details.aspx?familyid=8ea4fc68-7b03-43f6-bc41-af47e7aa8c7b
Microsoft Silverlight 4 when installed on all supported releases of Microsoft Windows servers:
https://www.microsoft.com/downloads/details.aspx?familyid=8ea4fc68-7b03-43f6-bc41-af47e7aa8c7b

Vulnerable software versions

Microsoft Silverlight: 4

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External links
http://technet.microsoft.com/en-us/library/security/ms12-034

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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.