Vulnerability identifier: #VU1231

Vulnerability risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2006-1245

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: Yes

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

Vendor: Microsoft

Description

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

The vulnerability exists due to boundary error in mshtml.dll library when processing HTML tag with large number of script action handlers such as onload and onmouseover. A remote attacker can create a specially crafted web page, trick the victim into visiting it and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability results in compromise of vulnerable system.

Mitigation
Install update from vendor's website:

• Internet Explorer 5.01 Service Pack 4 on Microsoft Windows 2000 Service Pack 4 – Download the update
• Internet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service Pack 4 or on Microsoft Windows XP Service Pack 1 – Download the update
• Internet Explorer 6 for Microsoft Windows XP Service Pack 2 – Download the update
• Internet Explorer 6 for Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1 – Download the update
• Internet Explorer 6 for Microsoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with SP1 for Itanium-based Systems – Download the update
• Internet Explorer 6 for Microsoft Windows Server 2003 x64 Edition – Download the update
• Internet Explorer 6 for Microsoft Windows XP Professional x64 Edition – Download the update

Vulnerable software versions

Microsoft Internet Explorer: 5.01 - 6

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External links
http://technet.microsoft.com/en-us/library/security/ms06-013.aspx

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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, proof of concept for this vulnerability is available.