Vulnerability in Unicode Scripts Processor could allow Remote Code Execution (2850869)

ITS Advisory Number: 
2013-073
Date(s) Issued: 
Tuesday, August 13, 2013
Subject: 
Vulnerability in Unicode Scripts Processor could allow Remote Code Execution (2850869)
Overview: 

A remote code execution vulnerability exists in the Unicode Scripts Processor included in affected versions of Microsoft Windows. The Unicode Script Processor enables a text layout client to format complex scripts. The vulnerability could be exploited if a user visits a specially crafted website or by opening a specially crafted attachment sent through email.

Successful exploitation of these vulnerabilities could result in either an attacker gaining the same privileges as the logged on user, or gaining session authentication credentials. Depending on the privileges associated with the user, an attacker could install programs; view, change, or delete data; or create new accounts with full user rights.

Systems Affected: 
  • Windows XP
  • Windows Server 2003
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
High
BUSINESS
Large and medium business entities: 
High
Small business entities: 
High
Home Users: 
High
Description: 

A remote code execution vulnerability exists in the Unicode Scripts Processor included in affected versions of Microsoft Windows. The vulnerability is caused when the Unicode Scripts Processor, included in affected versions of Microsoft Windows, incorrectly parses specific font types in a way that corrupts memory and allows for arbitrary code to be executed. The vulnerability could be exploited if a user visits a specially crafted website or by opening a specially crafted attachment sent through email.

Successful exploitation of these vulnerabilities could result in either an attacker gaining the same privileges as the logged on user, or gaining session authentication credentials. Depending on the privileges associated with the user, an attacker could install programs; view, change, or delete data; or create new accounts with full user rights.

Actions: 
  • 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.
  • Remind users not to open email attachments from unknown users or suspicious emails from trusted sources.
References: 
Microsoft:
https://technet.microsoft.com/en-us/security/bulletin/ms13-060
CVE:
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3181