CIS CYBER SECURITY ADVISORIES

MS-ISAC CYBER SECURITY ADVISORY NUMBER:
2010-104

DATE(S) ISSUED:
12/14/2010

SUBJECT:
Multiple Vulnerabilities in Internet Explorer Could Allow Remote Code Execution (MS10-090)

OVERVIEW:

Seven vulnerabilities have been discovered in Microsoft's web browser, Internet Explorer, which could allow an attacker to take complete control of an affected system. Exploitation may occur if a user visits or is redirected to a web page which is specifically crafted to take advantage of these vulnerabilities. Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

 

SYSTEMS AFFECTED:

  • Internet Explorer 6
  • Internet Explorer 7
  • Internet Explorer 8

 

RISK:
Government:

  • Large and medium government entities:High
  • Small government entities:High

Businesses:

  • Large and medium business entities:High
  • Small business entities:High

Home users: High

 

DESCRIPTION:

Seven vulnerabilities have been discovered in Microsoft Internet Explorer. Details of these vulnerabilities are as follows:

 

HTML Object Memory Corruption Vulnerability

Two remote code execution vulnerabilities exist in the way that Internet Explorer accesses an object that has not been correctly initialized or has been deleted. Exploitation may occur if a user visits a web page that is specifically crafted to take advantage of these vulnerabilities. Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

 

Cross-Domain information Disclosure Vulnerability

Two information disclosure vulnerabilities exist in Internet Explorer that could allow a remote attacker access to sensitive data. Exploitation may occur if a user visits a web page that is specifically crafted to take advantage of this vulnerability. Successful exploitation of this vulnerability could result in an attacker gaining access to another domain or Internet Explorer zone.

 

HTML Element Memory Corruption Vulnerability

Two remote code execution vulnerabilities exist as a result of Internet Explorer not being able to access an object that has been removed or not initialized correctly. Exploitation may occur if a user visits a web page that is specifically crafted to take advantage of these vulnerabilities. Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

 

Uninitialized Memory Corruption Vulnerabilities

A remote code executionvulnerability existsin the way that Internet Explorer accesses an object that has not been correctly initialized or has been deleted. Exploitation may occur if a user visits a web page that is specifically crafted to take advantage of these vulnerabilities. Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

 

Microsoft isreportingthat this vulnerability is being exploitedin targetedattacks.

RECOMMENDATIONS:

We recommend the following actions be taken:

  • Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.

REFERENCES:

Microsoft:

http://www.microsoft.com/technet/security/bulletin/ms10-090.mspx

CVE:

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3340

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3342

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3343

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3345

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3346

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3348

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3362

 

MS-ISAC:

http://www.msisac.org/advisories/2010/2010-097b.cfm