MS-ISAC CYBERSECURITY ADVISORIES

MS-ISAC ADVISORY NUMBER:
2015-138

DATE(S) ISSUED:
12/08/2015

SUBJECT:
Cumulative Security Update for Internet Explorer (MS15-124)

OVERVIEW:

Multiple vulnerabilities have been discovered in Microsoft Internet Explorer. These vulnerabilities could allow an attacker to execute code in the context of the browser if a user views a specially crafted web page. 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.

 

THREAT INTELLIGENCE:

 

One memory corruption vulnerability (CVE-2015-6164) has been publicly disclosed.

 

SYSTEM AFFECTED:

  • 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

 

TECHNICAL SUMMARY:

 

Microsoft Internet Explorer is prone to multiple vulnerabilities that could allow remote code execution. The vulnerabilities are as follows:

 

  • 23 memory corruption vulnerabilities could allow for remote code execution.

  • Two information disclosure vulnerabilities.

  • One scripting engine memory corruption vulnerabilities that could allow for remote code execution.

  • Three XSS filter bypass vulnerabilities that could lead to information disclosure

  • One VBScript and Jscript ASLR Bypass vulnerability. 

 

The most severe of these vulnerabilities could allow an attacker to execute remote code by luring a victim to visit a specially crafted malicious website. When the website is visited, the attacker's script will run within the context of the affected browser or with the same permissions as the affected user account. 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 updates immediately after appropriate testing.

  • Remind users not to visit websites or follow links provided by unknown or untrusted sources.

  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from untrusted sources.

 

REFERENCES:

 

Microsoft:

https://technet.microsoft.com/en-us/library/security/MS15-124

 

CVE:

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6083

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6134

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6135

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6136

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6138

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6139

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6140

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6141

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6142

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6143

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6144

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6145

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6146

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6147

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6148

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6149

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6150

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6151

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6152

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6153

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6154

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6155

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6156

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6157

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6158

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6159

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6160

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6161

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6162

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6164