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Vulnerability Alert

Microsoft Exchange Server RSS Feed Processing Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:27599
Version:1
First Published:2012 December 11 13:21 GMT
Last Published:2012 December 11 13:21 GMT
Port: Not available
CVE:CVE-2012-4791
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:4.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.0
 
Version Summary:Microsoft Exchange Server contains a vulnerability that could allow an authenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
Microsoft Exchange Server contains a vulnerability that could allow an authenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to improper processing of RSS feeds. An authenticated, remote attacker could exploit the vulnerability by creating a malicious RSS feed on the Exchange Server. If successful, the attacker could cause Exchange services to become unresponsive, resulting in a DoS condition.

Microsoft confirmed the vulnerability in a security bulletin and released software updates.
 
Warning Indicators
Microsoft Exchange Server 2007 SP3 and prior and Microsoft Exchange Server 2010 SP2 and prior are vulnerable.
 
IntelliShield Analysis
Only current users of a vulnerable system with valid user credentials could exploit the vulnerability, decreasing the likelihood of exploitation.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the December 2012 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 December 2012
 
Vendor Announcements
Microsoft has released a security bulletin at the following link: MS12-080
 
Impact
An authenticated, remote attacker could exploit the vulnerability to cause Exchange services to become unavailable, rendering mailboxes unavailable to legitimate users and resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper processing of RSS feeds.

An authenticated, remote attacker with a valid Exchange account could exploit the vulnerability by creating a malicious RSS feed in the affected application. When processed, the RSS feed could cause Exchange services to become unresponsive, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

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
 
Initial Release


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

Primary Products:
Microsoft, Inc.Exchange Server 2010 Base, SP1, SP2 | 2007 Base, SP1, SP2, SP3

Associated Products:
N/A




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LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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