MS-ISAC CYBERSECURITY ADVISORIES

MS-ISAC ADVISORY NUMBER:
2016-043

DATE(S) ISSUED:
03/08/2016

SUBJECT:
Multiple Vulnerabilities in Microsoft Windows PDF Library Could Allow for Remote Code Execution (MS16-028)

OVERVIEW:

Multiple vulnerabilities have been discovered in Microsoft Windows PDF Library, which could allow for remote code execution. Windows PDF Library is a library used for natively reading PDF files, and is included in various Windows operating system installations. These vulnerabilities are triggered if a user opens a specially crafted PDF file. 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:

There are no reports of these vulnerabilities being exploited in the wild.

 

SYSTEM AFFECTED:

  • Windows 8.1, RT 8.1

  • Windows 10

  • Windows Server 2012, 2012 R2, and Server Core installations

 

RISK:

Government:

  • Large and medium government entities: High

  • Small government entities: Medium

Businesses:

  • Large and medium business entities: High

  • Small business entities: Medium

Home users: Low

 

TECHNICAL SUMMARY:

Multiple vulnerabilities have been discovered in Microsoft Windows PDF Library, which could allow for remote code execution. These vulnerabilities are triggered if a user opens a specially crafted PDF file.In an email attack scenario, an attacker could exploit these vulnerabilities by sending an email and enticing a user to open a specially crafted PDF file that is attached.(CVE-2016-0117, CVE-2016-0118)

Successful exploitation of these vulnerabilities could result in the attacker gaining the same rights 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 or follow links provided by unknown or un-trusted sources.

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

 

REFERENCES:

Microsoft:

https://technet.microsoft.com/en-us/library/security/ms16-028

CVE:

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0117

http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0118