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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2003.0822 -- UNIRAS Brief - 645/03 Microsoft security issue affecting Exchange Server 2003 and Outlook Web Access (OWA) 28 November 2003 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: SharePoint Services 2.0 Exchange Server 2003 Outlook Web Access (OWA) Publisher: UNIRAS (UK Govt CERT) Operating System: Windows 2003 Impact: Access Privileged Data Access Required: Existing Account - --------------------------BEGIN INCLUDED TEXT-------------------- Title ===== Microsoft security issue affecting Exchange Server 2003 and Outlook Web Access (OWA). Detail ====== Microsoft has received reports of a security issue affecting Exchange Server 2003 and Outlook Web Access (OWA). The problem occurs when a user installs Windows SharePoint Services 2.0 on top of Exchange Server 2003 and Windows Server 2003. The deployment causes Kerberos authentication to be disabled in Internet Information Services (IIS) and can result in the incorrect handling of Outlook Web Access requests to an Exchange Server. At worst, this issue could result in access to mailboxes at random and only to an authenticated Exchange user in the same organization on the same network. Microsoft is working with customers to ensure their information is protected. Microsoft has published two Knowledge Base articles that detail the problem and instruct customers how to correct and avoid this issue. Microsoft Product Support has also successfully helped and is continuing to help customers who have problems. This information is available at http://support.microsoft.com/?id=832769 and http://support.microsoft.com/?id=832749 As a general rule, Microsoft recommends customers run Exchange 2003 with Kerberos enabled in Internet Information Services to achieve the most secure environment and that is why Windows Server 2003 ships with Kerberos enabled by default. Microsoft is committed to keeping customers' information safe and upon completion of investigating the problem, Microsoft will take the appropriate action to protect its customers and decide whether providing a fix and additional mitigation information is warranted. - ---------------------------------------------------------------------------------- UNIRAS wishes to acknowledge the contributions of Microsoft for the information contained in this Briefing. - ---------------------------------------------------------------------------------- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBP8btByh9+71yA2DNAQEVzgP8CQp7ubp3+odiwPT4Q8Vb5KKEY1lHY+5Q Ijt6Vfax7lyu5lacFrkv28NY7dgoV3uhajigL9q/6b2HHk+gx4YEZ5YRQmd86fMD +PQ7ne5qphHfNuUOKM8Ng6wMYh7n5bkoUkAC6SrsiH5XrFnTcaAMFPIwnMoOU91f mFJwfA8wMjM= =SRyS -----END PGP SIGNATURE-----