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securityvulnsSecurityvulnsSECURITYVULNS:DOC:3409
HistoryAug 23, 2002 - 12:00 a.m.

Security Bulletin MS02-045: Unchecked Buffer in Network Share Provider Can Lead to Denial of Service (Q326830)

2002-08-2300:00:00
vulners.com
24

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.


Issue:

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.

Mitigating Factors:

    • An administrator can block this attack by turning off anonymous
      access. However, this does not prevent legitimate users from
      exploiting this vulnerability.
    • An administrator can block access to SMB ports from untrusted
      networks. By blocking TCP ports 445 and 139 at the network
      perimeter, administrators can prevent this attack from untrusted
      parties. In a file and printing environment, this may not be a
      practical solution for legitimate users.
    • An administrator can stop the Lanman server service which prevents
      the attack, but again may not be suitable on a file and print
      sharing server.

Risk Rating:

  • Internet systems: Low
  • Intranet systems: Moderate
  • Client systems: Moderate

Patch Availability: