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Vulnerability Alert

Microsoft Outlook Web Access id Parameter Cross-Site Scripting Vulnerability

 
Threat Type:CWE-79: Cross-Site Scripting (XSS)
IntelliShield ID:20553
Version:1
First Published:2010 May 26 15:05 GMT
Last Published:2010 May 26 15:05 GMT
Port: Not available
Urgency:Unlikely Use
Credibility:Corroborated
Severity:Mild Damage
CVSS Base:4.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.3
 
Version Summary:

Microsoft Outlook Web Access contains a cross-site scripting vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary HTML or script code in a user's browser.? Updates are not available.

 
 
Description

Microsoft Outlook Web Access version 8.2.254.0 contains a cross-site scripting vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary HTML or script code in a user's browser.

The vulnerability is due to improper validation of user-supplied input to a parameter that could permit cross-site scripting attacks.? An attacker could exploit the vulnerability to inject arbitrary HTML or script code into the user's browser that could allow the attacker to spoof content, disclose potentially sensitive information, or take actions as the user on the site.

Proof-of-concept code that exploits this vulnerability is publicly available.

Microsoft has not confirmed this vulnerability, and software updates are not available.

 
Warning Indicators

Microsoft Outlook Web Access version 8.2.254.0 running on Microsoft Exchange Server 2007 SP2 and prior is vulnerable.? Additional versions may also be vulnerable.

 
IntelliShield Analysis

To exploit the vulnerability, an attacker must employ social engineering tactics, convincing the targeted user to follow a link to a malicious website.  An exploit could allow the attacker to conduct cross-site scripting attacks against the user that could lead to information disclosure or further attacks.

Although a proof-of-concept URL is available, exploitability has not been proven.  Only some versions of Outlook Web Access may be vulnerable when using certain versions of Internet Explorer.

 
Vendor Announcements

Vendor announcements are not available.

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to conduct cross-site scripting attacks.? An exploit could allow the attacker to obtain sensitive information about the user, such as authentication cookies.

 
Technical Information

This vulnerability is due to insufficient validation of user-supplied input to the id parameter. 

An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to follow a link that is designed to pass malicious HTML or script code to the unchecked parameter.  If the user follows the link, the URL may cause the vulnerable application to return unsanitized input to the user's browser, where the input may execute in the security context of the affected website.  If successful, the attacker could access sensitive browser-based information.

 
Safeguards

Administrators are advised to contact the vendor regarding future updates and releases.

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

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.

Users should verify that unsolicited links are safe to follow.

Administrators are advised to monitor affected systems.

 
Patches/Software

Patches and software updates are not available.

 
Alert History
 

Initial Release



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

Primary Products:
Microsoft, Inc.Outlook Web Access Original Release Base

Associated Products:
Microsoft, Inc.Exchange Server 2007 Base, SP1, SP2




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