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ISS Protection Brief: Vulnerability in Server Driver could result in Denial of Service
From: X-Force (xforceiss.net)
Date: Fri Jul 28 2006 - 15:36:28 CDT
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Internet Security Systems Protection Brief
July 28, 2006
Vulnerability in Server Driver could result in Denial of Service
Multiple versions of Microsoft Windows are vulnerable to a null pointer dereference in the server driver (srv.sys). By sending a specially-crafted network packet to an affected system, a remote attacker could cause the system to crash.
Attackers can reliably cause Microsoft Windows to blue screen. Users must reboot to recover from the crash. An exploit is available in the wild. As of this writing no patch is available for the vulnerability.
Microsoft Corporation: Windows 2000 SP4
Microsoft Corporation: Windows Server 2003
Microsoft Corporation: Windows Server 2003 Itanium
Microsoft Corporation: Windows Server 2003 SP1
Microsoft Corporation: Windows Server 2003 SP1 Itanium
Microsoft Corporation: Windows Server 2003 x64 Edition
Microsoft Corporation: Windows XP Pro x64 Edition
Microsoft Corporation: Windows XP SP1
Microsoft Corporation: Windows XP SP2
An exploit was released into the wild that was misconstrued as a denial of service proof of concept for the Windows Mailslot vulnerability (MS06-035). In fact, this proof of concept exploits a different vulnerability, which has not been patched, caused by a null pointer dereference. It is unlikely that this vulnerability could result in remote code execution; however, complete system crashes are reliable. As there is no patch available for this problem at the time of this writing, ISS has decided to provide coverage on an expedited basis.
The vulnerability exists in the Server Message Block protocol which runs on TCP ports 139 and 445. Both of these ports should be blocked at perimeter firewalls, both inbound and outbound.
About Internet Security Systems, Inc.
Internet Security Systems, Inc. (ISS) is the trusted security advisor to thousands of the world's leading businesses and governments, providing preemptive protection for networks, desktops and servers. An established leader in security since 1994, ISS' integrated security platform automatically protects against both known and unknown threats, keeping networks up and running and shielding customers from online attacks before they impact business assets. ISS products and services are based on the proactive security intelligence of its X-ForceŽ research and development team - the unequivocal world authority in vulnerability and threat research. ISS' product line is also complemented by comprehensive Managed Security Services. For more information, visit the Internet Security Systems Web site at www.iss.net or call 800-776-2362.
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