CIS CYBER SECURITY ADVISORIES

MS-ISAC CYBER SECURITY ADVISORY NUMBER:
2013-103

DATE(S) ISSUED:
11/12/2013

SUBJECT:
Cumulative Security Update for Internet Explorer (MS13-088)

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 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
  • Internet Explorer 9
  • Internet Explorer 10
  • Internet Explorer 11

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:

Two information disclosure and eight memory corruption vulnerabilities have been discovered in Internet Explorer. These vulnerabilities occur due to the way Internet Explorer improperly accesses objects in memory and could be exploited if a user visits a web page that is specifically crafted to take advantage of the vulnerabilities.

Successful exploitation 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.

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.
  • Remind users not to visit un-trusted websites, follow links, or open files provided by unknown or un-trusted sources.

REFERENCES:

Microsoft:

https://support.microsoft.com/kb/2888505
https://technet.microsoft.com/en-us/security/bulletin/ms13-088

CVE:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3871
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3910
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3911
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3912
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3914
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3915
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1916
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3917
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3908
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3909