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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0283 -- [Win] VMware Workstation Shared Folders Directory Traversal Vulnerability 2 May 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: VMware Workstation 5.5.3 build 34685 and prior Publisher: iDEFENSE Operating System: Windows Impact: Create Arbitrary Files Inappropriate Access Access: Existing Account CVE Names: CVE-2007-1744 Original Bulletin: http://labs.idefense.com/intelligence/vulnerabilities/ Comment: This vulnerability has been confirmed by iDefense using the affected VMWare workstation build on a Windows XPSP2 system. Other versions may also be affected. - --------------------------BEGIN INCLUDED TEXT-------------------- VMware Workstation Shared Folders Directory Traversal Vulnerability iDefense Security Advisory 04.27.07 http://labs.idefense.com/intelligence/vulnerabilities/ Apr 27, 2007 I. BACKGROUND VMware Workstation is a software virtualization system which allows multiple virtual computers to run on a single system. For more information visit the following URL. http://www.vmware.com/products/ws/ II. DESCRIPTION Remote exploitation of a design error in the "Shared Folders" feature of VMware Inc.'s VMware Workstation could allow an attacker to write arbitrary content from a guest system to arbitrary locations on the host system. The "Shared Folders" feature of VMware Workstation allows folders on the physical "host" system to be shared with virtual "guest" systems. Due to a flaw in the code which validates that the filename is safe, an attacker or malicious code within the guest system can read or write files on the host system in the context of the user running Workstation. III. ANALYSIS Exploitation allows an attacker to read or write arbitrary files on the host system. In order to exploit this vulnerability, the VMware system must have at least one folder shared. Although the "Shared Folders" feature is enabled by default, no folders are shared by default. If the 'Read Only' option for a shared folder is set, the attacker will only be able to read files from the host. The documentation states that VMware Tools must be installed in order to use the "Shared Folders" feature. While this is true of normal use of the feature, VMware Tools is not required to exploit this vulnerability. The vulnerable functionality is supplied by the "Backdoor I/O Port" interface. Some details of the interface protocol are publicly available. These details provide a starting point which allow an attacker to reverse engineer enough of the protocol to implement their own tool for performing these operations. IV. DETECTION iDefense confirmed this vulnerability to exist in VMware Workstation 5.5.3 build 34685 on a Windows XPSP2 host. Other versions may also be affected. V. WORKAROUND Disabling the "Shared Folders" feature in VMware will prevent exposure to this vulnerability. VI. VENDOR RESPONSE VMware Inc. has addressed this vulnerability by releasing new versions of their software. More information is available in the release notes provided by VMware Inc. VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-1744 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 03/20/2007 Initial vendor notification 03/20/2007 Initial vendor response 04/27/2007 Coordinated public disclosure IX. CREDIT This vulnerability was discovered by Greg MacManus of iDefense Labs. Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ X. LEGAL NOTICES Copyright © 2007 iDefense, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customerservice@idefense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information. _______________________________________________ - --------------------------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. 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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 iQCVAwUBRjfHtyh9+71yA2DNAQJdrQP/X7cppYPm6eXS4xSe9oNgAeI/4Xkw8QOF QT/Fm8UzC5x1prUSFTRUVG+qewtemd2YDO2gylWTDwaeansBhoKCceABVV8M9qt7 FNQEVh+TGOywQoM/+zq3p+XhImaMrGyL5qKnXYg2C7qhYnvDWyfcY53tJACyoTIZ 4Lp8uX+T2eg= =vGu/ -----END PGP SIGNATURE-----