Vulnerability identifier: #VU3041

Vulnerability risk: Critical

CVSSv3.1: 9.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2012-4792

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Microsoft Internet Explorer
Client/Desktop applications / Web browsers

Vendor: Microsoft

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

The weakness exists due to use-after-free error when handling the CDwnBindInfo object and attempting to access an object in memory that has not been initialized or has been deleted. A remote attacker can create a specially crafted Web site, trick the victim into visiting it, trigger memory corruption and execute arbitrary code on the system with privileges of the current user.

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

Note: the vulnerability was being actively exploited.

Mitigation
Install update from vendor's website:

Internet Explorer 6:
Windows XP Service Pack 3:
https://www.microsoft.com/downloads/details.aspx?FamilyID=20d8d873-a709-4834-a956-f3d9d82dbb73
Windows XP Professional x64 Edition Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=f35f2ea5-d60e-405a-9ed3-248e0d733c2b
Windows Server 2003 Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=1a7cfc5a-2872-4516-a371-f42d4d3969a6
Windows Server 2003 x64 Edition Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=00304f3b-069f-49dc-a416-b0b5fb97aa4b
Windows Server 2003 with SP2 for Itanium-based Systems:
https://www.microsoft.com/downloads/details.aspx?FamilyID=b2c635b7-56ad-426b-8bd6-4aee9deadb69

Internet Explorer 7:
Windows XP Service Pack 3:
https://www.microsoft.com/downloads/details.aspx?FamilyID=dcdcf814-e39d-4515-bc5d-12e11f214d08
Windows XP Professional x64 Edition Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=36c9d6a9-d939-4e19-b9f5-576fee048764
Windows Server 2003 Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=4b7c2bcd-a732-46ba-9d09-cc192efd4755
Windows Server 2003 x64 Edition Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=4911899c-863f-4499-9477-340ef8daad29
Windows Server 2003 with SP2 for Itanium-based Systems:
https://www.microsoft.com/downloads/details.aspx?FamilyID=b33197ab-f489-4c11-a229-044b186d7dda
Windows Vista Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=95d603e8-9440-4aa6-9765-20c77a55966a
Windows Vista x64 Edition Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=a35ccbff-c476-4ee2-be9c-5b6a4b1664e9
Windows Server 2008 for 32-bit Systems Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=3ce450f1-f71f-4d5d-bf1c-db4742522d18
Windows Server 2008 for x64-based Systems Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=0f87dd60-92c2-444c-a9ea-dfeb106c88fa
Windows Server 2008 for Itanium-based Systems Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?FamilyID=e47425e9-f53e-4e20-a7ec-b4c552bd66eb

Internet Explorer 8:
Windows XP Service Pack 3:
https://www.microsoft.com/downloads/details.aspx?familyid=4e0d584a-c684-408c-bc47-6bd4ecaa9b8a
Windows XP Professional x64 Edition Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?familyid=396f26bd-8c8b-459d-9467-6ec17a11c9d4
Windows Server 2003 Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?familyid=7f134d1c-670d-4528-b755-22124aa4d8c9
Windows Server 2003 x64 Edition Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?familyid=b0cf6516-aea6-4879-9a6e-171d4825ae20
Windows Vista Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?familyid=64b498a6-54fc-4b88-bcc3-2cc15a16abb5
Windows Vista x64 Edition Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?familyid=b427bace-5297-4593-9dd2-66847ae506c6
Windows Server 2008 for 32-bit Systems Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?familyid=2d1266fc-f6b0-4062-9799-7b3721c2cf52
Windows Server 2008 for x64-based Systems Service Pack 2:
https://www.microsoft.com/downloads/details.aspx?familyid=2f71f8e6-309c-4bea-abde-d91040c46611
Windows 7 for 32-bit Systems:
https://www.microsoft.com/downloads/details.aspx?familyid=d20f50ed-89c3-48cb-a78d-a44470fa1285
Windows 7 for 32-bit Systems Service Pack 1:
https://www.microsoft.com/downloads/details.aspx?familyid=d20f50ed-89c3-48cb-a78d-a44470fa1285
Windows 7 for x64-based Systems:
https://www.microsoft.com/downloads/details.aspx?familyid=c113b67f-42ca-4fea-ba45-aba6f94de154
Windows 7 for x64-based Systems Service Pack 1:
https://www.microsoft.com/downloads/details.aspx?familyid=c113b67f-42ca-4fea-ba45-aba6f94de154
Windows Server 2008 R2 for x64-based Systems :
https://www.microsoft.com/downloads/details.aspx?familyid=d2fffc43-a88f-4fe5-9b24-5677258011b8
Windows Server 2008 R2 for x64-based Systems Service Pack 1:
https://www.microsoft.com/downloads/details.aspx?familyid=d2fffc43-a88f-4fe5-9b24-5677258011b8
Windows Server 2008 R2 for Itanium-based Systems:
https://www.microsoft.com/downloads/details.aspx?familyid=fbcee22b-9801-4c9e-ba0c-eb4a54526d38
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1:
https://www.microsoft.com/downloads/details.aspx?familyid=fbcee22b-9801-4c9e-ba0c-eb4a54526d38

Vulnerable software versions

Microsoft Internet Explorer: 6 - 8

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External links
http://technet.microsoft.com/en-us/library/security/ms13-008

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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?

Yes. This vulnerability is being exploited in the wild.