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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1720 MS16-092 - Important: Security Update for Windows Kernel (3171910) 13 July 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft Windows Publisher: Microsoft Operating System: Windows 8.1 Windows RT 8.1 Windows Server 2012 Windows Server 2012 R2 Windows 10 Impact/Access: Modify Arbitrary Files -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2016-3272 CVE-2016-3258 Original Bulletin: https://technet.microsoft.com/en-us/library/security/MS16-092 - --------------------------BEGIN INCLUDED TEXT-------------------- Microsoft Security Bulletin MS16-092 - Important Security Update for Secure Boot (3177404) Published: July 12, 2016 Version: 1.0 Executive Summary This security update resolves vulnerabilities in Microsoft Windows. The most severe of the vulnerabilities could allow security feature bypass if the Windows kernel fails to determine how a low integrity application can use certain object manager features. This security update is rated Important for all supported releases of Microsoft Windows 8.1, Windows Server 2012, Windows Server 2012 R2, Windows RT 8.1, and Windows 10. Affected Software Windows 8.1 Windows Server 2012 Windows Server 2012 R2 Windows RT 8.1 Windows 10 Windows Server 2012 (Server Core Installation) Windows Server 2012 R2 (Server Core Installation) Vulnerability Information Windows File System Security Feature Bypass CVE-2016-3258 A security feature bypass vulnerability exists in the Windows kernel that could allow an attacker to exploit time of check time of use (TOCTOU) issues in file path-based checks from a low integrity application. An attacker who successfully exploited this vulnerability could potentially modify files outside of a low integrity level application. To exploit the vulnerability, an attacker would need to take advantage of another vulnerability to compromise the sandbox process from a low integrity application. The security update addresses the vulnerability by adding a validation check on how a low integrity application can use certain object manager features. The following table contains links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited Windows File System Security Feature Bypass CVE-2016-3258 No No Windows Kernel Information Disclosure Vulnerability CVE-2016-3272 An information disclosure vulnerability exists in Microsoft Windows when the Windows kernel fails to properly handle certain page fault system calls. An authenticated attacker who successfully exploited this vulnerability could disclose information from one process to another. To exploit the vulnerability, an attacker would have to either log on locally to an affected system, or convince a locally authenticated user to execute a specially crafted application. The update addresses this vulnerability by correcting how the Windows kernel handles certain page fault system calls. The following table contains links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited Windows Kernel Information Disclosure Vulnerability CVE-2016-3272 Yes No - --------------------------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 =========================================================================== 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 iQIVAwUBV4WRiIx+lLeg9Ub1AQglog/+NS0uUXvRZ3ZV+5fMa7m0MXxilsshTlYX lGEmnOF9iIPCTY1O1oH2N+Ce4MTyQyd3Exw4dq63K7f2sTIMaV9UkvNsng4SCkIU jTKETOuLlA4NBw2hCQNFUIpgxrvrdE2aOADuLjNieXbLxy7+GdrZRX+M0INIw9WA GkCiJEUgeXlHSHSAujHA7qbLv4Q07pi1oVAaKebXbAsqDyOjE7rQCMGFPzLxHDNr I7vHnKic7VfMMvBrlNHTLKP4A3zPUKPKOrIOV5313Dw7BaTkPOOiKevBsFr092RE 8DFYAcwPuiQDLfJ00wzT/L29wdNll9anNPKhkKhV1h82v3uL7kUlk9Bom2SXjDlp Stuzu2Tt02PB3juOleZRdHLHb4Nh8sQ7ZNav1c3caUnS8XbQlcZ+sVBESzYx+vPy KGefLsZEThQwDTrQhiytu8LKv9OnFv9GCagZKX+OglohrSBMUa2UznREg9RdKuKs ohP2ygJC/2OzsKXG+7jLz0zE8zxaAhlczY4Y+Udv+8LDeGuaSCYYirEfkNNJ1GMO 2cIFMx1263mI+GehZhhNxCYu7uulrBGCYZmhf33fmMTGauS+YnUs6UflVyV/PxRH 02Nr1VTDd9hGo4tbxAzOxMm2AjuOpmHVoes1r/GwXvtl/OZ4Yxl15VRx2WutQrmj YD/gS9arOZE= =meVj -----END PGP SIGNATURE-----