CIS CYBER SECURITY ADVISORIES

MS-ISAC CYBER SECURITY ADVISORY NUMBER:
2012-008

DATE(S) ISSUED:
2/14/2012

SUBJECT:
Cumulative Security Update for Internet Explorer (MS12-010)

OVERVIEW:

MS-ISAC ADVISORY NUMBER:
2012-008

DATE(S) ISSUED:
2/14/2012

SUBJECT:
Cumulative Security Update for Internet Explorer (MS12-010)

OVERVIEW:
Multiple vulnerabilities have been discovered in Microsoft's web browser, Internet Explorer, which could allow an attacker to take complete control of an affected system. Successful exploitation of these vulnerabilities could result in anattacker 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
Internet Explorer 9

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

Remote Code Execution Vulnerabilities

Two remote code execution vulnerabilities have been discovered in Internet Explorer. These are memory corruption vulnerabilities that occur due to the way Internet Explorer accesses objects in memory that have not been properly deleted. These vulnerabilities may be exploited if a user visits a web page that is specifically crafted to take advantage of the vulnerabilities. Successful exploitation of any of these vulnerabilities could result in an attacker taking complete control of the system.

Information Disclosure Vulnerabilities

Two information disclosure vulnerabilities have also been discovered in Internet Explorer. An attacker could successfully exploit the first vulnerability by convincing a user to perform a copy operation on some content and then convince the user to paste the information into a target website. Additionally, both vulnerabilities could be exploited if an attacker convinces a user to visit a specially crafted website which would allow the attacker to access information in other domains or Internet Explorer Zones.

RECOMMENDATIONS:
We recommend the following actions be taken:
Apply appropriate patches provided by Microsoft to vulnerable systems immediatelyafter 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://technet.microsoft.com/en-us/security/bulletin/ms12-010

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0010
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0011
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0012
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0013