PT-2013-73: XML External Entities Resolution vulnerability in Microsoft Office Word Vulnerable softwareMicrosoft Office Word Version: 2007 SP3 and earlier; 2003 SP3 and earlierMicrosoft Office Version: 2007 SP3 and earlier; 2003 SP3 and earlierMicrosoft Word Viewer Version: 2007 SP3 and earlierLink: http://microsoft.com/Severity levelSeverity level: Medium Impact: Internal Network Resources and File System Access, Denial of Service Access Vector: Remote CVSS v2: Base Score: 5.8 Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:P)CVE: CVE-2013-3160Software descriptionMicrosoft Office Word is a commercial word processor designed by Microsoft. Vulnerability descriptionThe specialists of the Positive Research center have detected an XML External Entities Resolution vulnerability in Microsoft Office Word and Word Viewer.The vulnerability is possible due to unsafe parsing of XML external entities. If an attacker makes a victim open a specially crafted XML document, Microsoft Office Word installed on the victim's system will automatically send the contents of local or remote resource to the attacker's server provided that the use of the remote XSD was approved by the user. It also makes possible to conduct denial of service attacks.How to fixUse vendor's advisory: http://technet.microsoft.com/en-us/security/bulletin/ms13-072Advisory status 26.11.2012 - Vendor gets vulnerability details 10.09.2013 - Vendor releases fixed version and details 09.10.2013 - Public disclosureCreditsThe vulnerability was detected by Timur Yunusov, Alexey Osipov and Ilya Karpov, Positive Research Center (Positive Technologies Company)Referenceshttp://en.securitylab.ru/lab/PT-2013-73 Reports on the vulnerabilities previously discovered by Positive Research:http://www.ptsecurity.com/research/advisory/ http://en.securitylab.ru/lab/
