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Vulnerability Alert

Microsoft SharePoint Server W3WP Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:30550
Version:1
First Published:2013 September 10 17:54 GMT
Last Published:2013 September 10 17:54 GMT
Port: Not available
CVE:CVE-2013-0081
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.7
Related Resources:
View related IPS SignatureView related Applied Mitigation BulletinView related Event Response
 
 
Version Summary:Microsoft SharePoint Server contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted system. Updates are available.
 
 
Description
A vulnerability in Microsoft SharePoint Server could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

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 submitting a crafted URL to the targeted system. A successful exploit could allow the attacker to cause the W3MP (W3wp.exe) process to stop responding to legitimate user requests, leading to a DoS condition for SharePoint sites running under the process.

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)
  • Microsoft SharePoint Server 2007 SP3 (32-bit and 64-bit)
  • Microsoft SharePoint Foundation 2010 SP1 and SP2
  • Microsoft SharePoint Server 2010 SP1 and SP2
  • Microsoft SharePoint Foundation 2013
  • Microsoft SharePoint Server 2013
 
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.

The W3wp.exe process must be restarted to recover from a successful attack.

Microsoft has resolved the vulnerability by correcting how the SharePoint server handles undefined workflows and parses URLs.

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 a security bulletin at the following link: MS13-067
 
Impact
An unauthenticated, remote attacker could exploit the vulnerability to cause the W3MP process to stop responding to legitimate user requests, leading to a DoS condition for SharePoint sites running under the process.
 
Technical Information
The vulnerability is due to insufficient validation of user-supplied input by the affected software when handling unassigned workflows.

An unauthenticated, remote attacker could exploit the vulnerability by submitting a crafted URL to the targeted system. When the malicious URL is processed, the Internet Information Services (IIS) worker process W3wp.exe could stop responding to legitimate user requests. A successful exploit could allow the attacker to cause the W3wp.exe become unresponsive and terminate abnormally, leading to a DoS condition for SharePoint sites running under the process. The process must be restarted to recover from a successful attack.
 
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 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 monitor critical 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
 
Initial Release


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

Primary Products:
Microsoft, Inc.Office SharePoint Server 2007 SP3 | 2007 x64 Edition SP3 | 2010 SP1, SP2 | 2013 Base
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 | 2013 Base

Associated Products:
N/A




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