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Multiple Vulnerabilities in Microsoft Uniscribe Could Allow for Remote Code Execution

MS-ISAC ADVISORY NUMBER:

2017-025

DATE(S) ISSUED:

03/14/2017

OVERVIEW:

Multiple vulnerabilities exist in Windows Uniscribe, the most severe of which could result in remote code execution. Uniscribe is a set of APIs that allow a high degree of control for fine typography and for processing complex scripts as well as supporting the display and editing of international text. Successful exploitation of the most severe 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. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

THREAT INTELLIGENCE:

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

SYSTEMS AFFECTED:

  • Microsoft Windows Vista
  • Microsoft Windows 7
  • Microsoft Windows 8.1
  • Microsoft Windows RT 8.1
  • Microsoft Windows 10
  • Microsoft Windows Server 2008
  • Microsoft Windows Server 2008 R2
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2016
  • Microsoft Windows Server Core Installations 2008
  • Microsoft Windows Server Core Installations 2008 R2
  • Microsoft Windows Server Core Installations 2012
  • Microsoft Windows Server Core Installations 2012 R2
  • Microsoft Windows Server Core Installations 2016

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 exist in Windows Uniscribe, the most severe of which could result in remote code execution. The vulnerabilities are as follows:

  • Multiple remote code execution vulnerabilities exist in Windows due to the way Windows Uniscribe handles objects in memory. (CVE-2017-0072, CVE-2017-0083, CVE-2017-0084, CVE-2017-0086, CVE-2017-0087, CVE-2017-0088, CVE-2017-0089, CVE-2017-0090)

  • Multiple information disclosure vulnerabilities exist when Windows Uniscribe improperly discloses the contents of its memory. (CVE-2017-0085, CVE-2017-0091, CVE-2017-0092, CVE-2017-0111, CVE-2017-0112, CVE-2017-0113, CVE-2017-0114, CVE-2017-0115, CVE-2017-0116, CVE-2017-0117, CVE-2017-0118, CVE-2017-0119, CVE-2017-0120, CVE-2017-0121, CVE-2017-0122, CVE-2017-0123, CVE-2017-0124, CVE-2017-0125, CVE-2017-0126, CVE-2017-0127, CVE-2017-0128)

Successful exploitation of the most severe 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. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

RECOMENDATIONS:

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 those from un-trusted sources.

  • Apply the Principle of Least Privilege to all systems and services.

REFERENCES:

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