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Vulnerability Alert

Microsoft Windows UDP Packet Processing Integer Overflow Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:24490
Version:2
First Published:2011 November 08 18:07 GMT
Last Published:2011 November 14 14:43 GMT
Port: Not available
CVE:CVE-2011-2013
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:10.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.8
Related Resources:
View related IPS Signature
 
 
Version Summary:

Proof-of-concept code that demonstrates an exploit of the Microsoft Windows UDP packet processing integer overflow arbitrary code execution vulnerability is publicly available. US-CERT has also released a vulnerability note to address this vulnerability.

 
 
Description

Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.

The vulnerability is due to improper processing of malformed UDP packets by the Windows TCP/IP stack.  An unauthenticated, remote attacker could exploit the vulnerability by sending malicious requests to the targeted system.  If successful, the attacker could execute arbitrary code on the system with elevated privileges.

Proof-of-concept code that demonstrates an exploit of this vulnerability is publicly available.

Microsoft confirmed the vulnerability in a security bulletin and released software updates.

 
Warning Indicators

The following Microsoft systems are affected:

  • Windows Vista SP2 and prior
  • Windows Vista x64 Edition SP2 and prior
  • Windows Server 2008 for 32-bit Systems SP2 and prior
  • Windows Server 2008 for x64-based Systems SP2 and prior
  • Windows Server 2008 for Itanium-based Systems SP2 and prior
  • Windows 7 for 32-bit Systems SP1 and prior
  • Windows 7 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for Itanium-based Systems SP1 and prior
 
IntelliShield Analysis

To exploit this vulnerability, the attacker must send malicious UDP packets to a targeted system.  Depending on the configuration of perimeter filtering devices, the attacker may require access to internal networks to send packets to a targeted host, which increases the difficulty of an exploit.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the November 2011 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 November 2011

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS11-083

US-CERT has released a vulnerability note at the following link: VU#951982

 
Impact

An unauthenticated, remote attacker could exploit the vulnerability to execute arbitrary code on a targeted system with elevated privileges.? Exploitation could result in a complete system compromise.

 
Technical Information

The vulnerability is due to improper processing of malformed UDP packets by the Windows TCP/IP stack.

An unauthenticated, remote attacker could exploit the vulnerability by sending malicious requests to the targeted system.  When processed, the packets could cause an integer overflow.  The attacker could leverage the resulting memory corruption to execute arbitrary code on the system with elevated privileges.

 
Safeguards
Administrators are advised to apply the appropriate updates.

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

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 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
4002/0UDP Host FloodS5722011 Jun 07 
 
Alert History
 

Version 1, November 8, 2011, 1:07 PM: Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system with elevated privileges.  Updates are available.



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

Primary Products:
Microsoft, Inc.Windows 7 for 32-bit systems Base, SP1 | for x64-based systems Base, SP1
Microsoft, Inc.Windows Server 2008 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit Base, SP1, SP2 | Itanium-Based Systems Edition Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit Base, SP1, SP2 | Essential Business Server Standard Base, SP1, SP2 | Essential Business Server Premium Base, SP1, SP2 | Essential Business Server Premium, 64-bit Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit Base, SP1, SP2 | Web Server Base, SP1, SP2 | Web Server, 64-bit Base, SP1, SP2
Microsoft, Inc.Windows Server 2008 R2 x64-Based Systems Edition Base, SP1 | Itanium-Based Systems Edition Base, SP1
Microsoft, Inc.Windows Vista Home Basic Base, SP1, SP2 | Home Premium Base, SP1, SP2 | Business Base, SP1, SP2 | Enterprise Base, SP1, SP2 | Ultimate Base, SP1, SP2 | Home Basic x64 Edition Base, SP1, SP2 | Home Premium x64 Edition Base, SP1, SP2 | Business x64 Edition Base, SP1, SP2 | Enterprise x64 Edition Base, SP1, SP2 | Ultimate x64 Edition Base, SP1, SP2

Associated Products:
N/A




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