Vulnerability Alert

Microsoft Windows Print Spooler Service Privilege Escalation Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:21318
Version:2
First Published:2010 September 14 18:04 GMT
Last Published:2010 September 22 13:48 GMT
Port: 135, 137, 138, 139, 445, 593
CVE:CVE-2010-2729
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:10.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.8
 
Version Summary:

Proof-of-concept code that demonstrates an exploit of the Microsoft Windows print spooler service privilege escalation vulnerability is publicly available.

 
 
Description

Microsoft Windows contains a vulnerability in the print spooler service that could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability exists due to an error in the Windows print spooler service.  An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious request to the targeted system.  If successful, the attacker could execute arbitrary code with elevated privileges on the targeted system.

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

Microsoft has confirmed this vulnerability in a security bulletin and released updated software.

 
Warning Indicators

The following Microsoft systems are affected:

  • Windows XP SP3 and prior
  • Windows XP Professional x64 Edition SP2 and prior
  • Windows Server 2003 SP2 and prior
  • Windows Server 2003 x64 Edition SP2 and prior
  • Windows Server 2003 for Itanium-based Systems with SP2 and prior
  • 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 and prior
  • Windows 7 for x64-based Systems
  • Windows Server 2008 R2 for x64-based Systems
  • Windows Server 2008 R2 for Itanium-based Systems
 
IntelliShield Analysis

Only systems with shared printers are vulnerable to remote exploitation of the vulnerability, reducing the number of vulnerable systems in a typical environment.

To exploit the vulnerability, an attacker likely requires access to internal networks, as external RPC requests from untrusted networks will likely be blocked by perimeter filtering devices.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the September 2010 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 2010 

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS10-061

 
Impact

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

 
Technical Information

The vulnerability exists due to an error in the Windows print spooler service.  The service fails to properly validate remote procedure call (RPC) requests and improperly determines user permissions.  As a result, the service may allow an unauthorized user to print to an arbitrary file location.

An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious RPC request to the targeted system.  When processed, the RPC request could allow the attacker to print to an arbitrary file location on the targeted system.  As a result, the attacker could place a file in any location on the system, possibly allowing the attacker to execute arbitrary code with elevated privileges.

 
Safeguards

Administrators are advised to apply the available software updates.

Administrators may consider disabling printer sharing.

Administrators can help protect affected systems from external attacks by using a solid firewall strategy.

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.

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 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
29459/0Microsoft Windows Print Spooler Design Flaw VulnerabilityS5132010 Sep 20 
 
Alert History
 

Version 1, September 14, 2010, 2:04 PM: Microsoft Windows contains a vulnerability in the print spooler service 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.Windows 7 for 32-bit systems Base | for x64-based systems Base
Microsoft, Inc.Windows Server 2003 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit (Itanium) Base, SP1, SP2 | Datacenter Edition x64 (AMD/EM64T) Base, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit (Itanium) Base, SP1, SP2 | Enterprise Edition x64 (AMD/EM64T) Base, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit (Itanium) Base, SP1, SP2 | Standard Edition x64 (AMD/EM64T) Base, SP2 | Web Edition Base, SP1, SP2
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 | Itanium-Based Systems Edition Base
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
Microsoft, Inc.Windows XP Home Edition Base, SP1, SP2, SP3 | Professional Edition Base, SP1, SP2, SP3 | Professional x64 (AMD/EM64T) Base, SP2

Associated Products:
N/A




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