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Microsoft Internet Explorer does not properly handle cached HTTPS contents

Vulnerability Note VU#795720

Original Release Date: 2004-10-19 | Last Revised: 2004-10-21

Overview

Microsoft Internet Explorer fails to properly validate cached HTTPS contents, allowing an attacker to obtain information or spoof information on a secure web site.

Description

The HTTPS protocol is used to provide authentication, encryption, integrity, and non-repudiation services to web applications. Microsoft Internet Explorer (IE) does not properly validate cached HTTPS content. An attacker could exploit this vulnerability by creating a web site with the same host name as the legitimate HTTPS protected web site. When the attacker's web site is viewed, the contents are cached. If the attacker redirects the victim's browser to the legitimate web site, the attacker's cached contents are then displayed within the context of that web site. The cached content could include script code, images, or other locally cached items.

Impact

An attacker may be able to spoof information on a secure web site. Using script, an attacker may be able to retrieve cookies or other information from a secure web session.

Solution

Apply a patch

Apply the patch referenced in MS04-038.


Do not save encrypted pages to disk

To prevent this vulnerability from being exploited, change the IE settings to not save encrypted contents to disk. To make this change, follow these steps (provided by MS04-038):

    1. In Internet Explorer, click Internet Options on the Tools menu.
    2. Click the Advanced tab.
    3. Under Settings, scroll to Security.
    4. Under Settings, in the Security section, click Do not save encrypted pages to disk.
    5. Click OK two times to return to Internet Explorer.

    Vendor Information

    795720
     
    Affected   Unknown   Unaffected

    Microsoft Corporation

    Updated:  October 15, 2004

    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 http://www.microsoft.com/technet/security/bulletin/ms04-038.mspx

    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 reporting this vulnerability. Microsoft credits Mitja Kolsek from ACROS Security for reporting the vulnerability.

    This document was written by Will Dormann.

    Other Information

    CVE IDs: CVE-2004-0845
    Severity Metric: 9.72
    Date Public: 2004-10-12
    Date First Published: 2004-10-19
    Date Last Updated: 2004-10-21 14:58 UTC
    Document Revision: 8

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