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Vulnerability Note VU#124113

Microsoft Exchange Outlook Web Access UTF character set label script injection vulnerability

Overview

Microsoft Exchange Outlook Web Access (OWA) fails to properly handle the UTF character set label, which can allow a remote, unauthenticated attacker to execute script within the security context of the OWA user.

I. Description

OWA allows users to access their email accounts on a Microsoft Exchange server from another host through a web browser. When a user opens a script-based email attachment, the web browser may execute the script on the client side. If executed, the script would have all the privileges of the OWA user, including access to and manipulation of messages and folders on the server.

II. Impact

A remote attacker with the ability to supply an email message containing specially crafted script may be able to execute the script in the security context of the victim user on the client system. For more information about this type of vulnerability, please see CERT Advisory CA-2000-02.

III. Solution

Apply an update

This issue is addressed in Microsoft Security Bulletin MS07-026.

Workarounds

Microsoft Security Bulletin MS07-026 provides several workarounds, including disabling OWA and restricting HTML attachments.

Systems Affected

VendorStatusDate NotifiedDate Updated
Microsoft CorporationVulnerable8-May-2007

References


http://www.microsoft.com/technet/security/bulletin/ms07-026.mspx
Improper authorization checking in IOS FTP server

Credit

This vulnerability was reported by Microsoft, who in turn credit Martijn Brinkers of Izecom.

This document was written by Will Dormann.

Other Information

Date Public:2007-05-08
Date First Published:2007-05-08
Date Last Updated:2007-05-09
CERT Advisory: 
CVE-ID(s):CVE-2007-0220
NVD-ID(s):CVE-2007-0220
US-CERT Technical Alerts: 
Metric:5.46
Document Revision:5

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