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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2010.0345 Vulnerabilities in Microsoft Exchange and Windows SMTP Service Could Allow Denial of Service 14 April 2010 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft Exchange 2000 and 2003 Windows SMTP Service Publisher: Microsoft Operating System: Windows Server 2008 Windows Server 2003 Windows XP Windows 2000 Impact/Access: Read-only Data Access -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2010-0025 CVE-2010-0024 Original Bulletin: http://www.microsoft.com/technet/security/bulletin/ms10-024.mspx - --------------------------BEGIN INCLUDED TEXT-------------------- Microsoft Security Bulletin (981832) Vulnerabilities in Microsoft Exchange and Windows SMTP Service Could Allow Denial of Service Published: April 13, 2010 Version: 1.0 General Information Executive Summary This security update resolves one publicly disclosed vulnerability and one privately reported vulnerability in Microsoft Exchange and Windows SMTP Service. The more severe of these vulnerabilities could allow denial of service if an attacker sent a specially crafted DNS response to a computer running the SMTP service. By default, the SMTP component is not installed on Windows Server 2003, Windows Server 2003 x64 Edition, or Windows XP Professional x64 Edition. This security update is rated Important for all supported editions of Microsoft Windows 2000, Windows XP, and Windows Server 2003; 32-bit and x64-based editions of Windows Server 2008; Windows Server 2008 R2 for x64-based Systems; and Microsoft Exchange Server 2003. This security update is rated Moderate for Microsoft Exchange Server 2000. The security update addresses the vulnerabilities by correcting the manner in which SMTP parses MX records and the manner in which SMTP allocates memory for interpreting SMTP command responses. Recommendation: The majority of customers have automatic updating enabled and will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871. For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update at the earliest opportunity using update management software, or by checking for updates using the Microsoft Update service. Known Issues: Microsoft Knowledge Base Article 981832 documents the currently known issues that customers may experience when installing this security update. The article also documents recommended solutions for these issues. Affected Software Microsoft Windows 2000 Service Pack 4 Windows XP Service Pack 2 Windows XP Service Pack 3 Windows XP Professional x64 Edition Service Pack 2 Windows Server 2003 Service Pack 2 Windows Server 2003 x64 Edition Service Pack 2 Windows Server 2003 with SP2 for Itanium-based Systems Windows Server 2008 for 32-bit Systems Windows Server 2008 for 32-bit Systems Service Pack 2 Windows Server 2008 for x64-based Systems Windows Server 2008 for x64-based Systems Service Pack 2 Windows Server 2008 R2 for x64-based Systems Microsoft Exchange Server 2000 Service Pack 3 Microsoft Exchange Server 2003 Service Pack 2 Vulnerability Information SMTP Server MX Record Vulnerability - CVE-2010-0024 A denial of service vulnerability exists in the way that the Microsoft Windows Simple Mail Transfer Protocol (SMTP) component handles specially crafted DNS Mail Exchanger (MX) resource records. An attempt to exploit the vulnerability would not require authentication, allowing an attacker to exploit the vulnerability by sending a specially crafted network message to a computer running the SMTP service. An attacker who successfully exploited this vulnerability could cause the SMTP service to stop responding until restarted. Mitigating Factors By default, the SMTP component is not installed on Windows Server 2003, Windows Server 2003 x64 Edition, or Windows XP Professional x64 Edition. SMTP Memory Allocation Vulnerability - CVE-2010-0025 An information disclosure vulnerability exists in the Microsoft Windows Simple Mail Transfer Protocol (SMTP) component due to the manner in which the SMTP component handles memory allocation. An attacker could exploit the vulnerability by sending invalid commands, followed by the STARTTLS command, to an affected server. An attacker who successfully exploited this vulnerability could read random e-mail message fragments stored on the affected server. Note that this vulnerability would not allow an attacker to execute code or to elevate their user rights directly, but it could be used to produce useful information that could be used to try to further compromise the affected system. - --------------------------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. NOTE: Third Party Rights 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 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 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 iD8DBQFLxPRC/iFOrG6YcBERAqSIAJ49ImLSK/USZt/Lnlpx8tP16y+JAACeNYfq 9p17qu+srfmhCxfwIRFN0oM= =vwSz -----END PGP SIGNATURE-----