Title: Unchecked Buffer in Network Share Provider Can Lead to Denial of Service (Q326830) Date: 22 August 2002 Software: Microsoft Windows NT 4.0 Workstation Microsoft Windows NT 4.0 Server Microsoft Windows NT 4.0 Server, Terminal Sever Edition Microsoft Windows 2000 Professional Microsoft Windows 2000 Server Microsoft Windows 2000 Advanced Server Windows XP Professional Impact: Denial of Service Max Risk: Moderate Bulletin: MS02-045
Microsoft encourages customers to review the Security Bulletin at: http://www.microsoft.com/technet/security/bulletin/MS02-045.asp.
SMB (Server Message Block) is the protocol Microsoft uses to share files, printers, serial ports, and also to communicate between computers using named pipes and mail slots. In a networked environment, servers make file systems and resources available to clients. Clients make SMB requests for resources and servers make SMB responses in what described as a client server, request- response protocol.
By sending a specially crafted packet request, an attacker can mount a denial of service attack on the target server machine and crash the system. The attacker could use both a user account and anonymous access to accomplish this. Though not confirmed, it may be possible to execute arbitrary code.