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Microsoft Outlook Web Access vulnerable to cross-site scripting

Vulnerability Note VU#300373

Original Release Date: 2005-06-14 | Last Revised: 2005-06-15

Overview

Microsoft Outlook Web Access may be vulnerable to cross-site scripting attacks.

Description

Microsoft Outlook Web Access (OWA) allows users to access their email accounts on a Microsoft Exchange server from another host through a web browser.

Microsoft Outlook Web Access for Exchange Server 5.5 contains a flaw in the HTML encoding routines used in the Compose New Message form that may allow an attacker to send a specially-crafted message to a user which then in turn runs a malicious script in the security context of the user reading the mail message.

Impact

A remote unauthenticated attacker may be able to execute arbitrary script code in the security context of the user reading the mail.

Solution

Apply An Update

Please see Microsoft Security Bulletin MS05-029 for more information, such as workarounds and patches.


Utilize Workarounds

Microsoft Security Bulletin MS05-029 recommends a number of workarounds, including:

    Uninstall Outlook Web Access

    Disable Outlook Web Access for each Exchange site

    Modify the Read.asp file to not encode HTML mail with the appropriate HTML markup

Vendor Information

300373
 
Affected   Unknown   Unaffected

Microsoft Corporation

Updated:  June 14, 2005

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please see Microsoft Security Bulletin MS05-029 for more information, such as workarounds and patches.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Acknowledgements

Thanks to Microsoft for information on this issue, who in turn thank Gaël Delalleau working with iDEFENSE for reporting this vulnerability.

This document was written by Ken MacInnis.

Other Information

CVE IDs: CVE-2005-0563
Severity Metric: 11.70
Date Public: 2005-06-14
Date First Published: 2005-06-14
Date Last Updated: 2005-06-15 02:29 UTC
Document Revision: 6

Sponsored by the Department of Homeland Security Office of Cybersecurity and Communications.