A remote stack-based buffer overflow exists in Microsoft Internet Explorer. The browser's vml rendering engine fails to check the length of a fill parameter on the rect tag resulting in a stack-based buffer overflow. With a specially crafted request that contains a vml graphic, an attacker can cause arbitrary code execution resulting in a loss of integrity.

Some recommendations include disabling active scripting or changing the access control list of the vgx.dll. Those recommendations do NOT successfully mitigate the risk.

Microsoft has released a patch to address this issue. Additionally, it is possible to correct the flaw by implementing the following workaround(s):

Disable active scripting, or change the access control list of vgx.dll. It has been reported that those recommendations have been reported to be unsuccessful.

To un-register Vgx.dll, follow these steps:

Click Start, click Run, type "regsvr32 -u "%ProgramFiles%\Common Files\Microsoft Shared\VGX\vgx.dll " (without the quotation marks), and then click OK.

• CVE ID: 2006-3866 (see also: NVD) 2006-4868 (see also: NVD)
• Bugtraq ID: 20096
• Secunia Advisory ID: 21989
• Milw0rm: 2425
• Exploit Database: 2425
• SCIP VulDB ID: 2552
• Metasploit ID: 28946
• ISS X-Force ID: 29004
• CERT VU: 416092
• Microsoft Knowledge Base Article: 925486 925568
• VUPEN Advisory: ADV-2006-3679
• Mail List Post: http://archives.neohapsis.com/archives/bugtraq/2006-09/0327.html
• News Article: http://blog.washingtonpost.com/securityfix/2006/09/unofficial_patch_released_for_1.html
  http://news.com.com/Microsoft+mulls+early+IE+patch+release/2100-1002_3-6119393.html
  http://www.eweek.com/article2/0,1895,2017626,00.asp
  http://www.theinquirer.net/default.aspx?article=37781
• Generic Informational URL: http://blogs.securiteam.com/?p=640
  http://sunbeltblog.blogspot.com/2006/09/seen-in-wild-zero-day-exploit-being.html
  http://www.avertlabs.com/research/blog/?p=90
  http://www.w3.org/TR/NOTE-VML.html
• Generic Exploit URL: http://downloads.securityfocus.com/vulnerabilities/exploits/20096.html
  http://downloads.securityfocus.com/vulnerabilities/exploits/vml.c
  http://downloads.securityfocus.com/vulnerabilities/exploits/vml.c
  http://immunitysec.com
  http://www.saintcorporation.com/cgi-bin/exploit_info/ie_vml_rect_fill
• Other Advisory URL: http://isc.sans.org/diary.html?storyid=1713
  http://sunbeltblog.blogspot.com/2006/09/vulnerable-versions-of-outlook.html
  http://vil.nai.com/vil/Content/v_140629.htm
  http://vil.nai.com/vil/Content/v_vul26881.htm
• Microsoft Security Bulletin: MS06-055

• Eric Sites - ericssunbelt-software.com - Sunbelt