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Vulnerability Alert

Microsoft Exchange and SharePoint Server Machine Authentication Check Validation Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:30551
Version:2
First Published:2013 September 10 17:54 GMT
Last Published:2013 December 10 18:57 GMT
Port: Not available
CVE:CVE-2013-1330
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:10.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.4
 
Version Summary:Microsoft has released an additional bulletin to address the machine authentication check validation arbitrary code execution vulnerability in Microsoft Exchange Server.
 
 
Description
A vulnerability in Microsoft Exchange and SharePoint Server could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to insufficient validation of user-supplied input by the affected software when handling unassigned workflows. An attacker could exploit the vulnerability by sending malicious content to a targeted system. A successful exploit could allow the attacker to execute arbitrary code with the privileges of the W3WP (W3wp.exe) service account. This could allow the attacker to completely compromise the system.

Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
 
Warning Indicators
The following Microsoft products are affected:
  • Microsoft SharePoint Portal Server 2003 SP3
  • Microsoft Windows SharePoint Services 2.0
  • Microsoft Windows SharePoint Services 3.0 SP3 (32-bit and 64-bit)
  • SharePoint Server 2007 SP3 (32-bit and 64-bit)
  • Microsoft SharePoint Foundation 2010 SP1 and SP2
  • Microsoft SharePoint Server 2010 SP1 and SP2
  • Microsoft Exchange Server 2007 SP3 and prior
  • Microsoft Exchange Server 2010 SP3 and prior
  • Microsoft Exchange Server 2013 Cumulative Update 3 and prior
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may require access to trusted, internal networks to send crafted requests to the affected software. This access requirement could limit the likelihood of a successful exploit.

Microsoft has resolved the vulnerability by properly implementing MAC.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the September 2013 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 September 2013
 
Vendor Announcements
Microsoft has released security bulletins at the following links: MS13-067 and MS13-105
 
Impact
An unauthenticated, remote attacker could exploit the vulnerability to execute arbitrary code with the elevated privileges of the application service account. This could allow the attacker to completely compromise the targeted system.
 
Technical Information
The vulnerability is due to the insufficient implementation of machine authentication check (MAC) by the affected software when handling unassigned workflows.

An attacker could exploit the vulnerability by sending crafted content to a targeted system. When the affected software processes the malicious content, the attacker could execute arbitrary code with the privileges of the application service account. This could allow the attacker to completely compromise the system.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators may consider implementing viewstate MAC via the EnableViewStateMac attribute.

Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.

Administrators may consider configuring the Microsoft Enhanced Mitigation Experience Toolkit (EMET) to work with the affected software.

Administrators are advised to use an unprivileged account when browsing the Internet.

Administrators are advised to monitor affected systems.
 
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 Microsoft Update service. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.
 
Alert History
 
Version 1, September 10, 2013, 5:54 PM: Microsoft SharePoint Server contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. Updates are available.


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

Primary Products:
Microsoft, Inc.Exchange Server 2007 Base, SP1, SP2, SP3 | 2010 Base, SP1, SP2, SP3 | 2013 Base, CU1, CU2, CU3
Microsoft, Inc.Office SharePoint Server 2007 SP3 | 2007 x64 Edition SP3 | 2010 SP1, SP2
Microsoft, Inc.SharePoint Portal Server 2003 SP3
Microsoft, Inc.Windows SharePoint Services 2.0 Base, SP1, SP2, SP3 | 3.0 SP3
Microsoft, Inc.SharePoint Foundation 2010 SP1, SP2

Associated Products:
N/A




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