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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1284 MS15-049: Vulnerability in Silverlight Could Allow Elevation of Privilege (3058985) 13 May 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft Silverlight Publisher: Microsoft Operating System: Windows OS X Impact/Access: Increased Privileges -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2015-1715 Original Bulletin: https://technet.microsoft.com/en-us/library/security/MS15-049 - --------------------------BEGIN INCLUDED TEXT-------------------- MS15-049: Vulnerability in Silverlight Could Allow Elevation of Privilege (3058985) Bulletin Number: MS15-049 Bulletin Title: Vulnerability in Silverlight Could Allow Elevation of Privilege Severity: Important KB Article: 3058985 Version: 1.0 Published Date: May 12, 2015 Executive Summary This security update resolves a vulnerability in Microsoft Silverlight. The vulnerability could allow elevation of privilege if a specially crafted Silverlight application is run on an affected system. To exploit the vulnerability an attacker would first have to log on to the system or convince a logged on user to execute the specially crafted application. This security update is rated Important for Microsoft Silverlight 5 and Microsoft Silverlight 5 Developer Runtime when installed on Mac or all supported releases of Microsoft Windows. For more information, see the Affected Software section. Affected Software Microsoft Silverlight 5 when installed on Mac Microsoft Silverlight 5 Developer Runtime when installed on Mac Microsoft Silverlight 5 when installed on all supported releases of Microsoft Windows clients Microsoft Silverlight 5 Developer Runtime when installed on all supported releases of Microsoft Windows clients Microsoft Silverlight 5 when installed on all supported releases of Microsoft Windows servers Microsoft Silverlight 5 Developer Runtime when installed on all supported releases of Microsoft Windows servers Vulnerability Information Microsoft Silverlight Out of Browser Application Vulnerability - CVE-2015-1715 An elevation of privilege vulnerability exists in Microsoft Silverlight that is caused when Silverlight improperly allows applications that are intended to run at a low integrity level (very limited permissions) to be executed at a medium integrity level (permissions of the current user) or higher. To exploit this vulnerability an attacker would first have to log on to the system or convince a logged on user to execute a specially crafted Silverlight application. An attacker who successfully exploited this vulnerability could execute arbitrary code with the same or higher level of permissions as the currently logged on user. An attacker could then install programs; view, change, or delete data; or create new accounts with full administrative rights. The update addresses the vulnerability by adding additional checks to ensure that non-elevated processes are restricted to run at a low integrity level (very limited permissions). Microsoft received information about this vulnerability through coordinated vulnerability disclosure. When this security bulletin was originally issued Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers. - --------------------------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 iQIVAwUBVVKGLBLndAQH1ShLAQK3ZhAApiPxQnFd3SYR40tKkfUGKoEhwVb2c87K IUrADmDOOYTvTO9DL39EXYAf2DdKDrLK5Q+CH4qg3LrpPmAUnp1kQA3331MX4jWy L076/rSM8NmBapARpqkAHgu1+bVIakyPh1eQoVEA0JOIzs/NM8AzLr+Ez+zffHZ6 4fCSCCr4c39NHJA64vKVeN1v70+ZGGcmFiKWvTDuo+ffaSs/s/08p1EnxFuU1S8K Z67gb2pXa+JEe6liQJ0ML/DEKQGqQanFhDl68EdmzYYidDHZ7NBowQkeC/kHR48d ES5L6L+IsOZ9MJQezcgoqFy4PHcVuYxrpmgf00h3m+m/Rtb6nwHbYBKgbzh+PHj8 VEJLVgBdGc/kh6dxmNrO637tfRSv/9qTfWLp/+HamZCH5d7MZ0Ep7ZiZ221MxSRc EaD0x4eRwo2ojG0BHakAEAUiy1l9mp2tw4Z5TP/MXNrE2vwn6YW2ADYxGoMrvCGD H46XZnMmyRaZwY3IdEqc8PyTAXnAtTO+q88U+ylZnZ3NX52GufwAZBj3jWSM5ozm vWOl08WAmIhOwSZv4ccc76LBPN5FyjhI9Zi+c36hak4l2nu+aEGEJNneWYIOuRqx v96jHPw69mnv5L63idItMqzQxoPcaZCQDfUsLyrrQ73X7OglVJWuPTtoia42XbJV LOGhroAdU80= =Ui6A -----END PGP SIGNATURE-----