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Vulnerability Alert

Microsoft Publisher Legacy File Format Parsing Pointer Dereference Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:18602
Version:2
First Published:2009 July 14 18:42 GMT
Last Published:2009 July 16 13:56 GMT
Port: Not available
CVE:CVE-2009-0566
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
 
Version Summary:

Additional technical information is available regarding the Microsoft Publisher legacy file format parsing pointer dereference vulnerability.

 
 
Description

Microsoft Office Publisher 2007 SP1 contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user.

This vulnerability exists due to improper processing of malformed legacy file formats.  An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious document.  If the user opens the document, the attacker could execute code resulting in a complete system compromise.

Microsoft has confirmed this vulnerability in a security bulletin and released software updates that correct it.

 
Warning Indicators

Microsoft Office Publisher 2007 SP1 is vulnerable.

 
IntelliShield Analysis

In order to exploit this vulnerability, an attacker relies upon user interaction.  The attacker must convince the user to view a malicious document, likely provided as an attachment to a malicious e-mail message.  The attacker may use social engineering techniques in an attempt to convince the user that the document comes from a trusted source. 

If an exploit is successful, the attacker could execute arbitrary code with the privileges of the user.  If that user holds privileges equivalent to the Administrator account, the attacker could execute code resulting in a complete compromise.  Systems that restrict user privileges may have a lower impact as the result of an exploit, as any executed code would run with limited privileges.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the July 2009 security bulletin release. This Cisco bulletin, which assists administrators in identifying or mitigating these vulnerabilities using Cisco devices, is available at the following link: Cisco Applied Mitigation Bulletin: Microsoft Security Bulletin Release for July 2009

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-030

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the user.  If that user holds elevated privileges, the attacker could take complete control of the system.

 
Technical Information

This vulnerability exists in the pubconv.dll module due to improper processing of malformed legacy file formats.  The processing of a malicious file could trigger an attacker-controlled memory pointer dereference to a table of function pointers, corrupting memory.  An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious document.  When opened, the document could corrupt memory in such a way that could allow the attacker to execute arbitrary code with the privileges of the user.

 
Safeguards

Administrators are advised to apply the applicable software updates.

Users are advised not to open unsolicited e-mail attachments. Users should verify that attachments are safe before opening them.

Users are advised to run applications with the least necessary privileges.

Administrators may consider using a host-based intrusion prevention system to help mitigate the impact of an exploit.

Administrators may consider preventing access to the pubconv.dll component to prevent processing of legacy file types.

 
Patches/Software

Microsoft customers can obtain updates directly by using the links in the security bulletin. These updates are also distributed by Windows automatic update features and available on the Windows Update website.  Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
1144/0Microsoft Office Publisher 2007 Remote Code ExecutionS6442012 Apr 30 
1144/1Microsoft Office Publisher 2007 Remote Code ExecutionS6442012 Apr 30 
1144/2Microsoft Office Publisher 2007 Remote Code ExecutionS6442012 Apr 30 
1144/3Microsoft Office Publisher 2007 Remote Code ExecutionS6442012 Apr 30 
1144/4Microsoft Office Publisher 2007 Remote Code ExecutionS6442012 Apr 30 
1144/5Microsoft Office Publisher 2007 Remote Code ExecutionS6442012 Apr 30 
19401/0Microsoft Publisher File Parsing VulnerabilityS4142009 Jul 14 
 
Alert History
 

Version 1, July 14, 2009, 2:42 PM: Microsoft Office Publisher contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user.  Updates are available.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Microsoft, Inc.Microsoft Office Publisher 2007 SP1

Associated Products:
N/A




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