CIS CYBERSECURITY ADVISORIES

MS-ISAC ADVISORY NUMBER:
2015-081

DATE(S) ISSUED:
7/14/2015

SUBJECT:
Cumulative Security Update for Internet Explorer (MS15-065)

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 elevated privileges on the system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

THREAT INTELLIGENCE:

There is no known proof-of-concept code available at this time. Updates are available.

SYSTEMS AFFECTED:

  • Internet Explorer 6
  • Internet Explorer 7
  • Internet Explorer 8
  • Internet Explorer 9
  • Internet Explorer 10
  • Internet Explorer 11

RISK:

Government:

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

Businesses:

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

Home users: High

TECHNICAL SUMMARY:

Multiple vulnerabilities were discovered in Internet Explorer due to the way objects in memory are improperly accessed. The vulnerabilities are as follows:

  • 19 Memory Corruption Vulnerabilities (CVE-2015-1733, CVE-2015-1738, CVE-2015-1767, CVE-2015-2383, CVE-2015-2384, CVE-2015-2385, CVE-2015-2388, CVE-2015-2389, CVE-2015-2390, CVE-2015-2391, CVE-2015-2397, CVE-2015-2401, CVE-2015-2403, CVE-2015-2404, CVE-2015-2406, CVE-2015-2408, CVE-2015-2411, CVE-2015-2422, CVE-2015-2425)
  • 5 Information Disclosure Vulnerabilities (CVE-2015-1729, CVE-2015-2410, CVE-2015-2412, CVE-2015-2413, CVE-2015-2414)
  • One Elevation of Privilege Vulnerability (CVE-2015-2402)
  • One ASLR Bypass Vulnerability (CVE-2015-2419)
  • One Cross Site Scripting Filter Bypass Vulnerability (CVE-2015-2398)
  • One Jscript9 Memory Corruption Vulnerability (CVE-2015-2419)
  • One VBScript Memory Corruption Vulnerability (CVE-2015-2372)
  • These vulnerabilities could allow an attacker to execute remote code by luring a victim to a malicious website. When the website is visited, the attacker's script will run with same permissions as the affected user account. Successful exploitation of these vulnerabilities could result in an attacker gaining elevated privileges on the system. 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 click links from unknown sources, or to click links without verifying the intended destination.

REFERENCES:

Microsoft:

https://technet.microsoft.com/library/security/MS15-065

CVE:

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1729

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1733

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1738

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1767

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2372

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2383

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2384

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2385

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2388

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2389

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2390

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2391

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2397

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2398

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2401

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2402

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2403

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2404

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2406

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2408

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2410

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2411

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2412

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2413

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2414

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2419

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2421

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2422

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2425