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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2012.0877 Vulnerability in Citrix Receiver with Online Plug-in for Windows could result in arbitrary code execution 13 September 2012 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Citrix Receiver Citrix XenApp Plugin for Windows Publisher: Citrix Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2012-4603 Original Bulletin: http://support.citrix.com/article/CTX134681 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability in Citrix Receiver with Online Plug-in for Windows could result in arbitrary code execution Document ID: CTX134681 / Created On: Sep 12, 2012 / Updated On: Sep 12, 2012 Severity: Medium Description of Problem A vulnerability has been identified in the Citrix Receiver with Online Plug-in for Windows that could potentially allow an attacker to execute arbitrary code on the client device in the context of the currently logged in user. This vulnerability is present in all versions of the Citrix Receiver for Windows up to and including version 3.2 and all versions of the Citrix Online Plug-in for Windows up to and including version 12.1. This vulnerability has been assigned the following CVE: CVE-2012-4603 What Customers Should Do This vulnerability has been addressed in the following products: - - The Citrix Receiver for Windows version 3.3 with Online Plug-in for Windows version 13.3 and later - - Version 12.3 of the Citrix Online Plug-in for Windows. Citrix recommends that customers upgrade their Citrix Receivers and Online Plug-ins to these versions and later. These new versions can be obtained from the following location: https://www.citrix.com/English/ss/downloads/results.asp?productID=1689163 Mitigating Factors To conduct a successful exploit, an attacker would have to convince a user to manually lauch a specially crafted malicious file from an SMB or WebDAV fileserver. Deployments that prevent connections to potentially untrustworthy fileservers will be less exposed to this vulnerability. Acknowledgements Citrix thanks Alexey Tyurin of the Digital Security Research Group (http://dsecrg.com/) for working with us to protect Citrix customers. What Citrix Is Doing Citrix is notifying customers and channel partners about this potential security issue. This article is also available from the Citrix Knowledge Center at http://support.citrix.com/. Obtaining Support on This Issue If you require technical assistance with this issue, please contact Citrix Technical Support. Contact details for Citrix Technical Support are available at http://www.citrix.com/site/ss/supportContacts.asp. Reporting Security Vulnerabilities to Citrix Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. If you would like to report a security issue to Citrix, please compose an e-mail to secure@citrix.com stating the exact version of the product in which the vulnerability was found and the steps needed to reproduce the vulnerability. This document applies to: - - Receiver for Macintosh - - Receiver for Windows - - XenApp Plug-in for Windows (32/64 Bit) - --------------------------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). 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