Windows SMB Denial of Service and Privilege Escalation - Advisories

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Windows SMB Denial of Service and Privilege Escalation

Secunia Advisory:	SA20635
Release Date:	2006-06-13
Last Update:	2006-06-15

Critical:	Less critical
Impact:	Privilege escalation DoS
Where:	Local system
Solution Status:	Vendor Patch

OS:	Microsoft Windows 2000 Advanced Server Microsoft Windows 2000 Datacenter Server Microsoft Windows 2000 Professional Microsoft Windows 2000 Server Microsoft Windows Server 2003 Datacenter Edition Microsoft Windows Server 2003 Enterprise Edition Microsoft Windows Server 2003 Standard Edition Microsoft Windows Server 2003 Web Edition Microsoft Windows XP Home Edition Microsoft Windows XP Professional


CVE reference:	CVE-2006-2373 (Secunia mirror) CVE-2006-2374 (Secunia mirror)

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Description: Ruben Santamarta has reported two vulnerabilities in Microsoft Windows, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and gain escalated privileges. 1) An input validation error exists within the "MRxSmbCscIoctlOpenForCopyChunk()" function in MRXSMB.SYS when handling certain DeviceIoControl requests. This can be exploited to overwrite kernel memory and allows arbitrary code execution with escalated privileges. 2) An input validation error exists within the "MrxSmbCscIoctlCloseForCopyChunk()" function in MRXSMB.SYS when handling certain requests. This can be exploited to cause a deadlock, which potentially leads to a DoS, by passing an invalid handle to the function. Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, using the Network Software Inspector. Solution: Apply patches. Microsoft Windows 2000 SP4: http://www.microsoft.com/downloads/de...=6ec86784-6b12-410b-8068-028c58ed5df7 Microsoft Windows XP SP1 or SP2: http://www.microsoft.com/downloads/de...=c17ddc07-204b-4a7f-8c5a-36b7865a030c Microsoft Windows XP Professional x64 Edition: http://www.microsoft.com/downloads/de...=89fbbdd0-7504-4807-9337-08324aa457e7 Microsoft Windows Server 2003 (with or without SP1): http://www.microsoft.com/downloads/de...043d69a41-6acb-4c64-89dc-2b9aef6e98fd Microsoft Windows Server 2003 (Itanium) (with or without SP1): http://www.microsoft.com/downloads/de...=e1d13c18-72d1-40b8-95b3-08aef8db9213 Microsoft Windows Server 2003 x64 Edition: http://www.microsoft.com/downloads/de...=b6018a61-b0ec-467e-9025-059d3c9f1c5f Provided and/or discovered by: Ruben Santamarta Changelog: 2006-06-15: Added additional information from Ruben Santamarta. Original Advisory: MS06-030 (KB914389): http://www.microsoft.com/technet/security/Bulletin/MS06-030.mspx Reverse Mode: http://www.reversemode.com/index.php?...&task=view&id=13&Itemid=5 http://www.reversemode.com/index.php?...&task=view&id=14&Itemid=5 iDEFENSE: http://www.idefense.com/intelligence/vulnerabilities/display.php?id=408 http://www.idefense.com/intelligence/vulnerabilities/display.php?id=409



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise. Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

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